JP3980756B2 - Vibration noise reducing device and vibration noise reducing device for water-cooled internal combustion engine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  In the present invention, the passage forming body that forms the liquid passage facing at least a part of the vibration generating portion is provided with vibration absorbing means for absorbing vibration transmitted from the vibration generating portion through the liquid in the liquid passage. More particularly, the present invention relates to a vibration noise reduction device that is preferably applied to a water-cooled internal combustion engine in which a cooling water passage including a water passage portion surrounding a cylinder portion serving as a vibration generation portion is provided in an engine body.
[0002]
[Prior art]
  In the water-cooled internal combustion engine, in order to reduce the piston slap noise that accompanies the piston colliding with the inner surface of the cylinder part, (1) a technique to increase the thickness of the cylinder part to keep the vibration amplitude small, (2 ) Conventionally, a method of suppressing the vibration amplitude by increasing the thickness of the outer wall portion of the cylinder block has been used.
[0003]
  Further, as a structure for suppressing vibration of incompressible cooling water existing in the cooling water channel, (3) as disclosed in Japanese Utility Model Publication No. 53-68814, a partition wall is provided outside the cooling water channel in the cylinder block. For example, a structure in which a sound insulation layer is provided is known.
[0004]
[Problems to be solved by the invention]
  However, in the methods (1) and (2), the weight of the engine body increases due to the increase in the thickness of the cylinder part and the cylinder block. In the structure of (3) above, the structure is complicated due to the double structure in which the cooling water channel and the sound insulation layer are arranged through the partition wall, making the manufacture difficult, increasing the manufacturing cost and the weight of the engine body. It will also increase.
[0005]
  Therefore, the applicant is provided with a vibration absorbing means provided with an elastic film in which an attachment hole is provided in the outer wall portion of the engine body facing the cooling water channel, and one surface faces the cooling water channel and the other surface faces the space portion. Japanese Patent Application No. 9-313138 has already proposed a vibration noise reduction device for a water-cooled internal combustion engine which is attached to the outer wall surface of the engine body so as to close the attachment hole.
[0006]
  According to this proposed technique, the pressure fluctuation of the cooling water is absorbed by the bending of the elastic film with one side facing the cooling water channel, and the excitation force acting on the outer wall of the engine body from the cooling water is effective. The piston slap sound radiated from the engine main body is reduced without increasing the weight of the engine main body.
[0007]
  However, in the proposed technique, the elastic membrane is held between the closing member attached to the engine body so as to close the attachment hole and the holding member attached to the inner end of the closing member. Since the space portion is formed between the inner end of the closing member and the elastic film, the closing member must be formed in a solid shape having a recess for forming the space portion at the inner end, and the closing member That is, the vibration absorbing means becomes relatively heavy.
[0008]
  The present invention has been made in view of such circumstances, and it is possible to effectively reduce vibration noise such as piston slap sound by a vibration absorbing means with a simple structure, and to reduce the weight of the vibration absorbing means. It is an object of the present invention to provide a vibration noise reducing device that can be realized.
[0009]
[Means for Solving the Problems]
  In order to achieve the above object, according to the first aspect of the present invention, there is provided a passage forming body that forms a liquid passage facing at least a part of the vibration generating portion, through the liquid in the liquid passage from the vibration generating portion. In the vibration noise reducing device provided with vibration absorbing means for absorbing the transmitted vibration, an attachment hole having an inner end opened in the liquid passage is provided in the outer wall portion of the passage forming body, and at least the inner end in the axial direction is opened. A support member that is formed into a cylindrical shape having a coaxial insertion hole and is fitted into and fixed to the mounting hole, and a bottomed cylindrical shape that has an end wall on the outer end side in the axial direction and is inserted into the insertion hole. The holding member supported by the support member and the one surface facing the liquid passage and the other surface facing the space formed between the end wall and the holding member.Axial end ofThe vibration absorbing means is constituted by an elastic film attached to the base plate.
[0010]
  According to a second aspect of the present invention, the vibration transmitted from the vibration generating part through the liquid in the liquid passage is absorbed by the passage forming body that forms the liquid passage facing at least a part of the vibration generating part. In the vibration noise reducing device provided with the vibration absorbing means, an attachment hole having an inner end opened in the liquid passage is provided in an outer wall portion of the passage forming body, and an insertion hole having at least an axial inner end opened is coaxially provided. A support member that is formed into a cylindrical shape and is fitted into and fixed to the mounting hole, and a bottomed cylindrical shape that has an end wall on the outer end side in the axial direction, and is inserted into the insertion hole and attached to the support member. Mounted on the caulking cylindrical portion formed at the inner end in the axial direction of the holding member with the other surface facing the space formed between the holding member to be supported and the end wall and one surface facing the liquid passage And the vibration absorbing hand Wherein the but are constituted.
[0011]
  Such claim 12DescribedeachAccording to the configuration of the invention, the vibration generated in the vibration generating section induces the vibration of the liquid in the liquid passage, but the pressure fluctuation of the liquid is absorbed by the bending of the elastic film with one surface facing the liquid passage. As a result, the excitation force acting on the passage forming body from the liquid is effectively reduced, and the vibration sound radiated from the passage forming body is reduced. In addition, the support member is formed in a cylindrical shape having an insertion hole open at least in the axial inner end, and the holding member formed in a bottomed cylindrical shape is inserted into the insertion hole and supported by the support member. The support member and the holding member can be reduced in weight, that is, the vibration absorbing means can be reduced in weight, and the vibration absorbing means can be attached to a part of the outer wall side of the passage forming body. It is possible to suppress the increase in the weight of the passage forming body as much as possible.
[0012]
  And claims3The invention described is the above claim 1.Or 2In addition to the configuration of the invention described above, a through-hole that communicates with the outer end of the insertion hole is provided at the outer end in the axial direction of the support member. The weight can be further reduced.
[0013]
  Claim4The invention described is the above claim 1.Or 2In addition to the configuration of the invention described above, a female screw is engraved on the inner surface of the mounting hole, and a male screw that engages with the female screw is provided on the outer periphery of the support member. Is characterized in that a through-hole capable of engaging a tool for rotating the support member is provided, and according to such a configuration, the support member, that is, the vibration absorbing means can be further reduced in weight by the through-hole. In addition, it is easy to attach / detach the support member to / from the passage forming body.
[0014]
  Claim5The invention described is the above-described claims 1 and 2.3 or 4In addition to the configuration of the invention described above, the support member is fitted and fixed to the mounting hole by screwing or press-fitting, and the holding member is a contact portion of the support member to the inner periphery of the mounting hole. The holding member is inserted into the insertion hole with at least a part of the holding member being brought into contact with the inner periphery thereof, and according to such a configuration, the vibration absorbing means can be made compact and screwed or By fitting and fixing the support member into the mounting hole by press-fitting, the support member is reinforced by a part of the holding member, so that the attachment rigidity of the support member to the passage forming body can be increased.
[0015]
  Claim6The invention described in claim 1 to claim 15In addition to the structure of the invention according to any one of the above, the support member and the holding member are formed of a cold-rolled steel plate specified by JIS SPCC, and the thickness of the holding member is greater than the thickness of the support member. According to this configuration, the support member and the holding member can be reduced in weight, and the thickness of the support member and the holding member are different, which is advantageous in increasing the vibration noise reduction effect. In addition, since the processing of the holding member becomes easy, the elastic film can be easily attached to the holding member.
[0016]
  Further claims7In the described invention, a cooling water passage including a water passage portion surrounding the cylinder portion is formed in an engine body including a cylinder block provided with a cylinder portion in which a piston is slidably fitted, and cooling is performed from the cylinder portion. The vibration noise reduction device for a water-cooled internal combustion engine provided with vibration absorbing means for absorbing vibration transmitted through the cooling water in the water channel, wherein a mounting hole having an inner end opened in the cooling water channel is an outer wall of the engine body A support member that is formed in a cylindrical shape having an insertion hole that is open at least in the axially inner end and is fitted and fixed in the mounting hole, and an end wall that is provided on the outer end side in the axial direction. A holding member that is formed in a bottom cylindrical shape and is inserted into the insertion hole and supported by the support member, and one surface faces the liquid passage and the other surface faces the space formed between the end walls. Not Serial holding memberAxial end ofThe vibration absorbing means is constituted by an elastic film attached to the base plate.
[0017]
  In the invention according to claim 8, a cooling water passage including a water passage portion surrounding the cylinder portion is formed in an engine body including a cylinder block provided with a cylinder portion in which a piston is slidably fitted. In the vibration noise reduction device for a water-cooled internal combustion engine provided with vibration absorbing means for absorbing vibration transmitted from the cylinder portion through the cooling water in the cooling water channel, the mounting hole having an inner end opened in the cooling water channel A support member provided in the outer wall portion of the engine body and formed in a cylindrical shape having an insertion hole with at least an axially inner end opened coaxially, and fitted and fixed in the mounting hole, and the end wall in the axial outer end In a space formed between the holding member that is formed in a bottomed cylindrical shape on the side and is inserted into the insertion hole and supported by the support member, and the end wall facing the liquid passage. other In the elastic membrane attached to the caulking cylindrical portion formed in the axially inner end of faces allowed the holding member, said vibration absorbing means, characterized in that it is configured.
[0018]
  Such claims7,8DescribedeachAccording to the configuration of the invention, the vibration of the cylinder part due to the collision of the piston with the inner surface of the cylinder part induces the vibration of the cooling water in the cooling water channel, but one surface faces the cooling water channel. The fluctuation of the pressure of the cooling water is absorbed by the deformation of the elastic film, the excitation force acting on the outer wall of the engine body from the cooling water is effectively reduced, and the piston slap sound emitted from the engine body is reduced. Will be reduced. In addition, the support member is formed in a cylindrical shape having an insertion hole open at least in the axial inner end, and the holding member formed in a bottomed cylindrical shape is inserted into the insertion hole and supported by the support member. It is possible to reduce the weight of the support member and the holding member, that is, the weight of the vibration absorbing means, and the vibration absorbing means can be attached to a part of the outer wall side of the engine body. It is possible to suppress the increase in the weight of the engine body as much as possible.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
  Hereinafter, embodiments of the present invention will be described based on examples of the present invention shown in the accompanying drawings.
[0020]
  1 to 6 show a first embodiment of the present invention. FIG. 1 is a perspective view of a cylinder block of a four-cylinder water-cooled internal combustion engine. FIG. 2 is an enlarged sectional view taken along line 2-2 in FIG. 3 is an enlarged view of the main part of FIG. 2, FIG. 4 is a view taken in the direction of arrow 4 in FIG. 3, FIG. 5 is a diagram showing the vibration mode of the cylinder block outer wall surface along the arrangement direction of the cylinder parts, and FIG. It is a figure which shows a characteristic in contrast with the past.
[0021]
  1 and 2, a cylinder block 11 of a water-cooled four-cylinder internal combustion engine constitutes an engine body E as a passage forming body together with a cylinder head and an oil pan (not shown). The first to fourth cylinder parts 13 which are vibration generating parts₁~ 13_FourAre provided in parallel, and each cylinder portion 13₁~ 13_FourPiston 12
... are slidably fitted. These cylinder parts 13₁~ 13_FourIn this embodiment, the cylinder liners 15 are cast into the inner wall portion 11a of the cylinder block 11, but the inner surface of the inner wall portion 11a may be ground. Further, the engine body E is formed with a cooling water channel 14 as a liquid passage through which the liquid is circulated.₁~ 13_FourIncluding a water channel portion 14a formed in the cylinder block 11 so as to surround the same.
[0022]
  By the way, the outer surface of the pistons 12 and the cylinder portions 13 are provided.₁~ 13_FourThere is a minute gap between the inner surfaces of the cylinder portions 13.₁~ 13_FourWhen the pistons 12 are moved up and down, the pistons 12 ...₁~ 13_FourThe cylinder part 13₁~ 13_FourThe vibration is transmitted to the cooling water in the cooling water passage 14. Therefore, since the cooling water is incompressible, a pressure change is caused even by slight vibration, and an excitation force due to the pressure change of the cooling water is applied to the outer wall portion 11b of the cylinder block 11 facing the cooling water passage 14. As a result, the outer wall portion 11b vibrates and the piston slap sound is emitted to the outside.
[0023]
  Therefore, vibration absorbing means 16 that absorbs vibrations of the cooling water in the cooling water passage 14 and suppresses the excitation force applied to the outer wall portion 11b of the cylinder block 11 as much as possible to reduce piston slap noise.₁... but each cylinder part 13₁~ 13_Four2nd and 3rd cylinder parts 13 in the middle position along the arrangement direction of₂, 13_Three Are attached to the outer wall portion 11b of the cylinder block 11 at positions corresponding to the respective sleeve bore centers. The outer wall portion 11b of the cylinder block 11 has attachment holes 17 corresponding to the vibration absorbing means 161. Provided.
[0024]
  Vibration absorbing means 16₁Is an insertion hole 18 whose inner end in the axial direction is open.₁A support member 19 that is coaxially formed and is attached to the outer wall portion 11b.₁And a bottomed cylindrical shape having an end wall 20 on the outer end side in the axial direction.₁Holding member 21 inserted and fixed by light press fitting₁And the holding member 21 with one surface facing the liquid passage 14 and the other surface facing the space 22 formed between the end wall 20 and the other surface.₁The elastic film 23 is attached to the inner end in the axial direction of the support member 19.₁Is fitted and fixed in the mounting hole 17 by, for example, screwing.
[0025]
  3 and 4 together, a cylindrical boss 24 is integrally projected on the outer wall portion 11b of the cylinder block 11, and an attachment hole 17 having an inner end opened to the water channel portion 14a. However, the outer end thereof is provided in the outer wall portion 11 b so as to open to the outer end of the boss portion 24, and a female screw 25 is engraved on the inner surface of the mounting hole 17.
[0026]
  Support member 19₁The insertion hole 18₁Are formed of a rigid metal material such as an aluminum alloy, and has a cylindrical portion 26 and a flange portion 27 protruding radially outward from the outer end of the cylindrical portion 26. On the outer periphery of 26, a male screw 28 that is screwed into the female screw 25 of the mounting hole 17 is provided.
[0027]
  The support member 19₁At the outer end of the insertion hole 18₁An annular step portion 29 that faces the water channel portion 14a is formed between the outer end of the insertion hole 18 and the insertion hole 18.₁Through hole 30 leading to the outer end of the₁And the through hole 30 is provided.₁As clearly shown in FIG. 4, the male screw 28 is screwed into the female screw 25 to support the support member 19.₁When the screw is screwed into the mounting hole 17, the support member 19₁It is formed in a hexagonal shape so that a tool for rotating the tool can be engaged. Thus, the support member 19₁Is screwed into the mounting hole 17 so that the annular gasket 31 is sandwiched between the flange portion 27 and the boss portion 24.
[0028]
  Holding member 21₁Is integrally provided with a bottomed cylindrical portion 32 having an end wall 20 at the inner end and a flange portion 33 projecting radially outward from the inner end opening of the bottomed cylindrical portion 32 according to JIS SPCC. By the cold-rolled steel sheet specified, the support member 19₁The cylindrical portion 26 is formed to be thinner than the cylindrical portion 26.₁The insertion hole 18 is brought into contact with the inner end of the cylindrical portion 26 of the insertion hole 18.₁Is lightly press-fitted into. Thus, the holding member 21₁The bottomed cylindrical portion 32 of the support member 19₁In the insertion hole 18, at least a part of the outer periphery of the bottomed cylindrical part 32 is brought into contact with the inner periphery of the cylindrical part 26 at the contact part to the inner periphery of the mounting hole 17 of the cylindrical part 26.₁Will be lightly press-fitted.
[0029]
  The elastic film 23 is formed in a disk shape from, for example, cloth, rubber reinforced with synthetic fiber or glass fiber, synthetic resin, or metal in order to improve its durability. The circumference is the holding member 21₁The holding member 21 is bonded to the flange 33 at the inner end by vulcanization or the like.₁A space 22 is formed between the end wall 20 and the elastic film 23.
[0030]
  The vibration absorbing means 16₁The elastic film 23 is set so as not to protrude into the cooling water passage 14 from the inner surface of the outer wall portion 11b of the cylinder block 11 in the state of being attached to the engine body E.
[0031]
  By the way, the mounting hole 17 and the vibration absorbing means 16 are used.₁The piston 12 is disposed at the second and third cylinder portions 13.₂, 13_ThreeIt is desirable to be close to the position where the inner surface of the piston is hit, and it is known that the generation timing of the slap vibration with respect to the crank angle is within 25 degrees before and after the top dead center of the piston 12. When the sum of the piston displacement amount and the axial length of the piston 12 is A, the mounting hole 17 and the vibration absorbing means 16 are located within the range A from the upper surface of the cylinder block 11.₁Is preferably disposed.
[0032]
  Further, according to the experiments of the present inventor, each cylinder portion 13₁ ~ 13_Four The velocity amplitude of vibration accompanying the impact from the piston 12 of each cylinder portion 13₁~ 13_FourAs shown in FIG.₁~ 13_Four2nd and 3rd cylinder parts 13 which are the intermediate parts along the arrangement direction of₂ , 13_ThreeThe velocity amplitude increases at the portion corresponding to the sleeve bore center. Therefore, the mounting hole 17 and the vibration absorbing means 16₁Each cylinder 13₁~ 13_FourIn a state where the cylinder block 11 is viewed from the side orthogonal to the arrangement direction of the second and third cylinder portions 13₂ , 13_ThreeIt is desirable that the portion corresponding to the sleeve bore center of the cylinder block 11 is disposed on the outer wall portion 11b of the cylinder block 11, respectively.
[0033]
  Next, the operation of the first embodiment will be described. The outer surface of each piston 12 and each cylinder portion 13 are described.₁~ 13_FourEach cylinder portion 13 is formed by a minute gap between the inner surfaces of the cylinder portions 13.₁~ 13_FourThe pistons 12 ... collide with the inner surface of each cylinder part 13₁~ 13_FourWhen this is vibrated, the vibration is transmitted to the incompressible cooling water in the cooling water passage 14 to induce a pressure change of the cooling water. However, a mounting hole 17 is provided in the outer wall portion 11b of the cylinder block 11 at a portion facing the water channel portion 14a of the cooling water channel 14, and the vibration absorbing means 16 is closed so as to close the mounting hole 17.₁Is attached to the vibration absorbing means 16.₁Is an insertion hole 18 whose inner end in the axial direction is open.₁The support member 19 is formed in a cylindrical shape having the same axis, and is fitted into and fixed to the mounting hole 17.₁And a bottomed cylindrical shape having an end wall 20 on the outer end side in the axial direction.₁Holding member 21 press-fitted into₁And the holding member 21 with one surface facing the liquid passage 14 and the other surface facing the space 22 formed between the end wall 20 and the other surface.₁The elastic film 23 is attached to the inner end in the axial direction. Therefore, the pressure fluctuation of the cooling water is absorbed by the bending of the elastic film 23, and the excitation force acting on the outer wall portion 11b of the cylinder block 11 from the cooling water is effectively reduced. Moreover, since the space 22 facing the other surface of the elastic film 23 is covered with the end wall 20, the sound due to the vibration of the elastic film 23 is caused by the support member 19.₁The piston slap sound radiated from the cylinder block 11 can be effectively reduced without being radiated to the outside.
[0034]
  The support member 19₁However, the insertion hole 18 is opened at the inner end in the axial direction.₁Are cylindrical, and have a holding member 21.₁Is a bottomed cylindrical shape, so that the support member 19₁And holding member 21₁Weight reduction, that is, vibration absorbing means 16₁ It is possible to reduce the weight of the vibration absorbing means 16 and the vibration absorbing means 16 on a part of the outer wall side of the cylinder block 11.₁Vibration absorbing means 16 is attached.₁The increase in the weight of the cylinder block 11, that is, the engine main body E due to the attachment of can be minimized.
[0035]
  Moreover, the support member 19₁ The insertion hole 18 is provided at the outer end in the axial direction.₁Through hole 30 leading to the outer end of the₁Is provided so that the support member 19 is provided.₁That is, the vibration absorbing means 16₁Can be further reduced in weight, and the through hole 30 can be reduced.₁However, the support member 19₁The support member 19 has a male screw 28 that is formed so as to be able to engage with a tool for rotating the screw and that engages with a female screw 25 engraved on the inner surface of the mounting hole 17.₁Provided on the outer periphery of the vibration absorbing means 16.₁The attachment / detachment operation to / from the engine body E is extremely easy, and replacement and maintenance of the elastic film 23 can be easily performed.
[0036]
  Further, a support member 19 fitted and fixed in the mounting hole 17 by screwing.₁The support member 19 is a contact portion to the inner periphery of the mounting hole 17.₁Holding member 21 on the inner periphery of₁Since at least a part of them is in contact, the vibration absorbing means 16₁In addition to the compactness of the supporting member 19 by screwing.₁The support member 19 is inserted into the mounting hole 17 and fixed at the fixing portion.₁Holding member 21₁The support member 19 is reinforced with a part of the support member 19.₁The mounting rigidity to the engine main body E can be increased, and the support member 19₁It is possible to make the thickness of the cylindrical portion 26 relatively small, and this also supports the support member 19.₁Can be reduced in weight.
[0037]
  The support member 19₁The holding member 21 is made thinner than the thickness of the cylindrical portion 26 in FIG.₁Is formed, the cylindrical portion 26 and the holding member 21 are formed.₁Are different in natural frequency, which is advantageous in increasing the vibration noise reduction effect.
[0038]
  Moreover, the holding member 21₁The holding member 21₁Support member 19₁Since the flange 33 that restricts the moving end in the light press-fitting direction is provided, the holding member 21 is held by the flange 33.₁Holding member 21 until light press-fitting is restricted₁Can be lightly press-fitted, and the workability of the light press-fitting work can be improved.
[0039]
  Furthermore, since the elastic film 23 does not protrude into the cooling water channel 14 from the inner surface of the outer wall portion 11b in the cylinder block 11, it is possible to avoid the elastic film 23 from inhibiting the flow of the cooling water in the cooling water channel 14 as much as possible. The cooling water passage 14 can be made smooth and the vibration absorbing means 16₁The cooling performance can be maintained to the same extent as a conventional water-cooled internal combustion engine that is not equipped with.
[0040]
  Here, the third cylinder portion 13_ThreeFIG. 6 shows the result of the verification of the vibration acceleration of the outer wall portion 11b of the cylinder block 11 at the portion corresponding to FIG.₁Whereas the conventional one not having a relative height is relatively high as indicated by the broken line, the acceleration according to the present invention is effectively reduced as indicated by the solid line, and the vibration absorbing means 16 according to the present invention is reduced.₁It is clear that the piston slap noise can be effectively reduced.
FIG. 7 shows a second embodiment of the present invention, and parts corresponding to the first embodiment are given the same reference numerals.
[0041]
  The vibration absorbing means 16 is closed so as to close the mounting hole 17 provided in the outer wall portion 11b of the cylinder block 11.₂Is attached to the outer wall 11b of the cylinder block 11, and the vibration absorbing means 16₂Is an insertion hole 18 whose inner end in the axial direction is open.₁A support member 19 that is coaxially formed and is screwed into the mounting hole 17.₁And a bottomed cylindrical shape having an end wall 20 on the outer end side in the axial direction.₁Holding member 21 inserted and fixed by light press fitting₂And the holding member 21 with one surface facing the liquid passage 14 and the other surface facing the space 22 formed between the end wall 20 and the other surface.₂ The caulking cylindrical portion 34 formed at the inner end in the axial direction ofAnd an elastic film 23 attached to the surface.
[0042]
  Holding member 21₂Are connected to the bottomed cylindrical portion 32 having the end wall 20 at the outer end, the flange 33 projecting radially outward from the inner end opening of the bottomed cylindrical portion 32, and the outer periphery of the flange 33. The caulking cylindrical portion 34 is integrally formed, and is formed of a cold-rolled steel plate specified by JIS SPCC.₁The insertion hole 18 is brought into contact with the inner end of the cylindrical portion 26 of the insertion hole 18.₁Is lightly press-fitted into.
[0043]
  Holding member 21₂ The caulking cylindrical portion 34 is caulked so as to be engaged with the outer peripheral portion of the disc-shaped elastic film 23, and the elastic film 23 is sandwiched between the caulking cylindrical portion 34 and the flange portion 33.
[0044]
  According to the second embodiment, the same effect as that of the first embodiment can be obtained at the same configuration as that of the first embodiment. Moreover, the holding member 21₂Is formed of a cold-rolled steel sheet defined by JIS SPCC, so that the holding member 21₂Can be reduced as much as possible, and the elastic film 23 is held by the caulking process.₂Easy to install on.
[0045]
  FIG. 8 shows a third embodiment of the present invention, and parts corresponding to the respective embodiments are given the same reference numerals.
[0046]
  The vibration absorbing means 16 is closed so as to close the mounting hole 17 provided in the outer wall portion 11b of the cylinder block 11._ThreeIs attached to the outer wall 11b of the cylinder block 11, and the vibration absorbing means 16_ThreeIs an insertion hole 18 whose inner end in the axial direction is open.₂Is formed in a cylindrical shape and is screwed into the mounting hole 17.₂And a bottomed cylindrical shape having an end wall 20 on the outer end side in the axial direction.₂Holding member 21 inserted and fixed by light press fitting_ThreeAnd the holding member 21 with one surface facing the liquid passage 14 and the other surface facing the space 22 formed between the end wall 20 and the other surface._ThreeThe elastic film 23 is attached to the inner end in the axial direction.
[0047]
  Support member 19₂ The insertion hole 18₂Is formed by bending a cold-rolled steel sheet as defined by JIS SPCC, and a cylindrical portion 36 that protrudes radially outward from the outer end of the cylindrical portion 36. In the outer periphery of the cylindrical portion 36, a male screw 28 that is screwed into the female screw 25 of the mounting hole 17 is provided.
[0048]
  The support member 19₂The outer end of the support member 19₂A through hole 30 formed in a hexagonal shape so that a tool for rotating the tool can be engaged.₁However, the insertion hole 18₂ It is provided so as to communicate with the outer end.
[0049]
  Holding member 21_ThreeIs a support member 19 made of a cold-rolled steel sheet defined by JIS SPCC.₂It is formed in a bottomed cylindrical shape that is thinner than the cylindrical portion 36 of the insertion hole 18.₂Is lightly press-fitted into. Moreover, the support member 19₂The inner end of the insertion hole 18₂Holding member 21 press-fitted into_ThreeIt is caulked so as to be inclined inward in the radial direction in order to prevent detachment to the cooling water channel 14 side. Further, the entire outer periphery of the disc-shaped elastic film 23 is formed on the holding member 21._ThreeIt is bonded to the inner periphery of the inner end opening by vulcanization or the like.
[0050]
  According to the third embodiment, the same effects as those of the first embodiment can be obtained at the same configuration as that of the first embodiment. Moreover, the support member 19₂And holding member 21_Three Is formed of a cold-rolled steel sheet specified by JIS SPCC.₂And holding member 21_ThreeCan be further reduced in weight. Also, the holding member 21_ThreeThe thickness of the support member 19₂By setting the thickness to be thinner than the thickness of the cylindrical portion 36, it is advantageous for enhancing the vibration noise reduction effect.
[0051]
  FIG. 9 shows a fourth embodiment of the present invention, and portions corresponding to the respective embodiments are given the same reference numerals.
[0052]
  The vibration absorbing means 16 is closed so as to close the mounting hole 17 provided in the outer wall portion 11b of the cylinder block 11._FourIs attached to the outer wall 11b of the cylinder block 11, and the vibration absorbing means 16_FourIs an insertion hole 18 whose inner end in the axial direction is open.₂Is formed in a cylindrical shape and is screwed into the mounting hole 17._ThreeAnd a bottomed cylindrical shape having an end wall 20 on the outer end side in the axial direction.₂Holding member 21 inserted and fixed by light press fitting₂And the holding member 21 with one surface facing the liquid passage 14 and the other surface facing the space 22 formed between the end wall 20 and the other surface.₂ The caulking cylindrical portion 34 formed at the inner end in the axial direction ofAnd an elastic film 23 attached to the surface.
[0053]
  Support member 19_ThreeThe insertion hole 18₂Are formed by bending a cold-rolled steel sheet defined by JIS SPCC, and a cylindrical portion 36 that protrudes radially outward from the outer end of the cylindrical portion 36. In the outer periphery of the cylindrical portion 36, a male screw 28 that is screwed into the female screw 25 of the mounting hole 17 is provided.
[0054]
  Holding member 21₂Are connected to the bottomed cylindrical portion 32 having the end wall 20 at the outer end, the flange 33 projecting radially outward from the inner end opening of the bottomed cylindrical portion 32, and the outer periphery of the flange 33. The support member 19 is integrally formed with a caulking cylindrical portion 34 and is made of a cold-rolled steel plate defined by JIS SPCC._ThreeThe cylindrical portion 36 is formed to be thinner than the cylindrical portion 36._ThreeThe insertion hole 18 is brought into contact with the inner end of the cylindrical portion 36 of the insertion hole 18.₂Is lightly press-fitted into.
[0055]
  Holding member 21₂The caulking cylindrical portion 34 is caulked so as to engage with the outer peripheral portion of the disc-shaped elastic film 23, and the elastic film 23 is sandwiched between the caulking cylindrical portion 34 and the flange portion 33.
[0056]
  According to the fourth embodiment, the same effects as those of the first to third embodiments can be obtained in the same configuration as the first to third embodiments.
[0057]
  FIGS. 10 and 11 show a fifth embodiment of the present invention, and parts corresponding to the above-described embodiments are given the same reference numerals.
[0058]
  The vibration absorbing means 16 is closed so as to close the mounting hole 17 provided in the outer wall portion 11b of the cylinder block 11._FiveIs attached to the outer wall portion 11 b of the cylinder block 11. This vibration absorbing means 16_FiveIs an insertion hole 18 whose inner end in the axial direction is open.₂Is formed in a cylindrical shape and is screwed into the mounting hole 17._FourAnd a bottomed cylindrical shape having an end wall 20 on the outer end side in the axial direction.₂Holding member 21 inserted and fixed by light press fitting₂And the holding member 21 with one surface facing the liquid passage 14 and the other surface facing the space 22 formed between the end wall 20 and the other surface.₂ The caulking cylindrical portion 34 formed at the inner end in the axial direction ofAnd an elastic film 23 attached to the surface.
[0059]
  Support member 19_FourThe insertion hole 18₂Are formed by bending a cold-rolled steel sheet defined by JIS SPCC, and a cylindrical portion 36 that extends outward in the radial direction from the outer end of the cylindrical portion 36. In the outer periphery of the cylindrical portion 36, a male screw 28 that is screwed into the female screw 25 of the mounting hole 17 is provided.
[0060]
  The outer shape of the collar portion 38 is the support member 19._FourFor example, the support member 19 is formed in a hexagonal shape so that a tool for rotating the tool can be engaged._FourFor example, a circular through hole 30 is provided at the outer end of₂However, the insertion hole 18₂It is provided so as to communicate with the outer end.
[0061]
  Holding member 21₂Are connected to the bottomed cylindrical portion 32 having the end wall 20 at the outer end, the flange 33 projecting radially outward from the inner end opening of the bottomed cylindrical portion 32, and the outer periphery of the flange 33. The support member 19 is integrally formed with a caulking cylindrical portion 34 and is made of a cold-rolled steel plate defined by JIS SPCC._ThreeThe cylindrical portion 36 is formed to be thinner than the cylindrical portion 36._FourThe insertion hole 18 is brought into contact with the inner end of the cylindrical portion 36 of the insertion hole 18.₂Is lightly press-fitted into.
[0062]
  According to the fifth embodiment, the same effects as those of the first to fourth embodiments can be obtained in the same configuration as the first to fourth embodiments.
[0063]
  Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above-described embodiments, and various design changes can be made without departing from the present invention described in the claims. Is possible.
[0064]
  For example, in the above-described embodiment, the case where the present invention is applied to a water-cooled internal combustion engine has been described. It can be widely implemented as a device for reducing sound.
[0065]
  In each of the above embodiments, the support member is screwed into the mounting hole, but may be press-fitted. Furthermore, the insertion hole provided in the support member may be opened not only at the inner end in the axial direction but also at the outer end in the axial direction. In this case, the outer end of the insertion hole only needs to function as a through hole.
[0066]
【The invention's effect】
  Claim 1 as described aboveOr 2According to the described invention, it is possible to reduce the vibration sound emitted from the passage forming body by the vibration absorbing means, and to reduce the weight of the vibration absorbing means, and to attach the vibration absorbing means. It is possible to suppress the increase in the weight of the passage forming body as much as possible.
[0067]
  And claims3According to the described invention, the support member, that is, the vibration absorbing means can be further reduced in weight.
[0068]
  Claim4According to the described invention, the vibration absorbing means can be further reduced in weight, and the support member can be easily attached to and detached from the passage forming body.
[0069]
  Claim5According to the described invention, the support member is reinforced by a part of the holding member at the fitting / fixing portion of the support member into the mounting hole by screwing or press-fitting, and the rigidity of the attachment to the passage member is increased. The vibration absorbing means can be made compact.
[0070]
  Claim6According to the described invention, it is possible to reduce the weight of the support member and the holding member, and it is advantageous for enhancing the vibration noise reduction effect, and it is easy to attach the elastic film to the holding member.
[0071]
  Further claims7 or 8According to the described invention, the piston slap sound radiated from the engine body can be reduced, and the weight of the vibration absorbing means can be reduced. It is possible to suppress the increase in weight as much as possible.
[Brief description of the drawings]
FIG. 1 is a perspective view of a cylinder block of a four-cylinder water-cooled internal combustion engine in a first embodiment.
FIG. 2 is an enlarged cross-sectional view taken along line 2-2 of FIG.
FIG. 3 is an enlarged view of a main part of FIG.
4 is a view taken in the direction of arrow 4 in FIG. 2;
FIG. 5 is a diagram showing a vibration mode of a cylinder block outer wall surface along the arrangement direction of the cylinder portions.
FIG. 6 is a diagram showing vibration acceleration characteristics with respect to frequency in comparison with the prior art.
FIG. 7 is a cross-sectional view corresponding to FIG. 3 of the second embodiment.
FIG. 8 is a cross-sectional view corresponding to FIG. 3 of a third embodiment.
FIG. 9 is a cross-sectional view corresponding to FIG. 3 of the fourth embodiment.
FIG. 10 is a cross-sectional view corresponding to FIG. 3 of the fifth embodiment.
11 is a view taken in the direction of arrow 11 in FIG.
[Explanation of symbols]
11 ... Cylinder block
11b ... outer wall
12 ... Piston
13₁~ 13_Four... Cylinder as a vibration generator
14: Cooling water channel as a liquid passage
14a ... waterway
16₁~ 16_Five... Vibration absorbing means
17 ... Mounting hole
18₁ , 18₂... Insertion holes
19₁~ 19_Four... Support members
20 ... end wall
21₁~ 21_Three... Holding members
22 ... Space
23 ... Elastic membrane
25 ... Male thread
28 ... Female thread
30₁, 30₂ ... Through holes
E ... Engine body as a passage forming body

Claims (8)

From the vibration generating part (13 _{1 to} 13 ₄ ) to the liquid passage (14), the passage forming body (E) that forms the liquid passage (14) facing at least a part of the vibration generating part (13 _{1 to} 13 ₄ ) is provided. ) In the vibration noise reducing device provided with vibration absorbing means (16 ₁ , 16 ₃ ) for absorbing vibration transmitted through the liquid in the mounting hole (17) whose inner end is opened in the liquid passage (14). ) Is provided in the outer wall (11b) of the passage forming body (E), and is formed in a cylindrical shape having insertion holes (18 ₁ , 18 ₂ ) coaxially open at least at the inner ends in the axial direction. (17) A support member (19 ₁ , 19 ₂ ) to be fitted and fixed, and a bottomed cylindrical shape having an end wall (20) on the outer end side in the axial direction, and the insertion holes (18 ₁ , 18 _2). holding member supported on the support member (19 _1, 19 ₂₎ while being inserted into) 21 _1, 21 ₃₎ and the holding member to face the other surface in the space (22) formed between said end wall (20) causes facing the one side to the liquid passage (14) (21 _1, 21 ₃ ) and the elastic film (23) attached to the inner end in the axial direction constitute the vibration absorbing means (16 ₁ , 16 ₃ ). Vibration generator (13 ₁ ~ 13 _Four ) To the passage forming body (E) that forms the liquid passage (14) with at least a portion thereof facing the vibration generating portion (13). ₁ ~ 13 _Four ) To absorb the vibration transmitted from the liquid in the liquid passage (14) (16) ₂ , 16 _Four , 16 _Five ) Is provided with a mounting hole (17) having an inner end opened in the liquid passage (14) in the outer wall (11b) of the passage forming body (E), and at least in the axial direction. Insert hole with open end (18 ₁ , 18 ₂ ) Is formed in a cylindrical shape having the same axis, and is fitted into and fixed to the mounting hole (17) (19). ₁ , 19 _Three , 19 _Four ) And an end wall (20) on the outer end side in the axial direction. ₁ , 18 ₂ ) And the support member (19 ₁ , 19 _Three , 19 _Four The holding member (21) supported by ₂ And the holding member (21) with one surface facing the liquid passage (14) and the other surface facing the space (22) formed between the end wall (20). ₂ And the elastic membrane (23) attached to the caulking cylindrical portion (34) formed at the inner end in the axial direction of the vibration absorbing means (16). ₂ , 16 _Four , 16 _Five ) Is configured. Claims wherein the axially outer end of the support member (19 ₁ to 19 _4), characterized in that the through-hole (30 _1, 30 ₂₎ is provided leading to the outer end of the insertion hole (18 _1, 18 ₂₎ Item 3. The vibration noise reducing device according to Item 1 or 2 . A female screw (25) is engraved on the inner surface of the mounting hole (17), and a male screw (28) that is screwed into the female screw (25) is provided on the outer periphery of the support member (19 _{1 to} 19 ₃ ). , the axially outer end of the support member (19 ₁ to 19 _3), said support member (19 ₁ to 19 ₃₎ engageable with a tool for rotating the through-hole (30 ₁₎ that is provided The vibration noise reducing apparatus according to claim 1 or 2, characterized in that: The support members (19 _{1 to} 19 ₄ ) are inserted and fixed in the mounting holes (17) by screwing or press-fitting, and the holding members (21 _{1 to} 21 ₃ ) are moved to the inner periphery of the mounting holes (17). At least a part of the holding member (21 _{1 to} 21 ₃ ) is brought into contact with the inner periphery of the support member (19 _{1 to} 19 ₄ ) at the contact portion of the support member (19 _{1 to} 19 ₄ ), and the insertion is performed. The vibration noise reducing device according to claim 1, 2 , 3 or 4 , wherein the vibration noise reducing device is inserted into the hole (18 ₁ , 18 ₂ ). The support members (19 _{2 to} 19 ₄ ) and the holding members (21 ₂ , 21 ₃ ) are formed of cold-rolled steel plates specified by JIS SPCC, and the thickness of the holding members (21 ₂ , 21 ₃ ) is The vibration noise reducing device according to claim 1 , wherein the supporting member (19 _{2 to} 19 ₄ ) is set thinner than a thickness of the supporting member (19 _{2 to} 19 ₄ ). The cylinder body (13 _{1 to} 13 ₄ ) is surrounded by an engine body (E) including a cylinder block (11) provided with a cylinder part (13 _{1 to} 13 ₄ ) in which a piston (12) is slidably fitted. A cooling water channel (14) including a water channel portion (14a) is formed and absorbs vibrations transmitted from the cylinder portions (13 _{1 to} 13 ₄ ) through the cooling water in the cooling water channel (14). In the vibration noise reduction device for a water-cooled internal combustion engine provided with absorbing means (16 ₁ , 16 ₃ ), a mounting hole (17) having an inner end opened in the cooling water channel (14) has an outer wall of the engine body (E). A support member provided in the portion (11b) and formed in a cylindrical shape having an insertion hole (18 ₁ , 18 ₂ ) coaxially open at least at the inner end in the axial direction, and fitted into and fixed to the mounting hole (17) (19 _1, 19 _2), the end wall (2 The insertion hole (18) and is formed into a bottomed cylindrical shape having the axially outer end side _1, 18 ₂₎ holding member supported on the support member (19 _1, 19 ₂₎ while being inserted into (21 ₁ , 21 ₃ ) and one surface facing the liquid passage (14) and the other surface facing the space (22) formed between the end wall (20) and the holding member (21 ₁ , 21 ₃ ) A vibration noise reducing device for a water-cooled internal combustion engine, characterized in that the vibration absorbing means (16 ₁ , 16 ₃ ) is constituted by the elastic membrane (23) attached to the inner end in the axial direction . Cylinder portion (13 for slidably fitting the piston (12) ₁ ~ 13 _Four The cylinder body (E) including the cylinder block (11) provided with the cylinder portion (13) ₁ ~ 13 _Four And a cooling water channel (14) including a water channel portion (14a) that surrounds the cylinder portion (13). ₁ ~ 13 _Four ) To absorb vibration transmitted through the cooling water in the cooling water channel (14) (16). ₂ , 16 _Four , 16 _Five Is provided with an attachment hole (17) having an inner end opened in the cooling water passage (14) in the outer wall (11b) of the engine body (E), An insertion hole (18 with at least an axial inner end open) ₁ , 18 ₂ ) Is formed in a cylindrical shape having the same axis, and is fitted into and fixed to the mounting hole (17) (19). ₁ , 19 _Three , 19 _Four ) And an end wall (20) on the outer end side in the axial direction. ₁ , 18 ₂ ) And the support member (19 ₁ , 19 _Three , 19 _Four The holding member (21) supported by ₂ And the holding member (21) with one surface facing the liquid passage (14) and the other surface facing the space (22) formed between the end wall (20). ₂ And the elastic membrane (23) attached to the caulking cylindrical portion (34) formed at the inner end in the axial direction of the vibration absorbing means (16). ₂ , 16 _Four , 16 _Five A vibration noise reducing device for a water-cooled internal combustion engine, characterized in that

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