JP3741843B2 - Vibration sound reducing apparatus and elastic membrane assembling method thereof - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
According to the present invention, vibration absorbing means for absorbing vibration transmitted from the vibration generating unit through the liquid in the liquid passage is provided in the passage forming body that forms the liquid passage facing at least a part of the vibration generating unit. The present invention relates to a vibration noise reducing device.
[0002]
[Prior art]
In a water-cooled internal combustion engine, in order to reduce the piston slap noise that accompanies the collision of the piston with the inner surface of the cylinder part, (1) a technique of increasing the thickness of the cylinder part to reduce the vibration amplitude, (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 the vibration of incompressible cooling water existing in the cooling water channel, as disclosed in (3) 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 (3), the structure is complicated because the cooling water channel and the sound insulation layer are arranged via the partition wall, the structure is complicated, the manufacturing is difficult, the manufacturing cost is increased, and the weight of the engine body is increased. It will also increase.
[0005]
The present invention has been made in view of such circumstances, and a vibration noise reduction device capable of effectively reducing vibration noise such as piston slap noise with a simple structure that does not cause an increase in weight of the passage forming body, It is another object of the present invention to provide a method for assembling an elastic film of a vibration noise reducing apparatus for assembling an elastic film as a component of the vibration noise reducing apparatus.
[0006]
[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 the vibration absorbing means for absorbing the transmitted vibration, the vibration absorbing means opens the inner end of the liquid passage and closes the through hole provided in the outer wall portion of the passage forming body. A closing member attached to the outer wall, and a space formed between the closing member and an elastic film attached to the closing member with both sides facing the liquid passage, wherein the elastic film is the blocking member Membrane that forms a space between the cylindrical seal portion that is fitted and fixed to the outer periphery of the cylindrical mounting portion projecting from the inner end of the member, and the end portion of the seal portion. And formed into a cap shape Have been characterized by until just before sealing the space portion in contact with at least the closing member during attachment to the closure member has a shape which is curved in the closure member.
[0007]
According to the configuration of the invention described in claim 1, the vibration generated in the vibration generating section induces the vibration of the liquid in the liquid passage, but the elastic film with one surface facing the liquid passage. The fluctuation of the pressure of the liquid is absorbed by the bending, 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. Moreover, since the vibration absorbing means is 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 due to the attachment of the vibration absorbing means as small as possible. By the way, when the elastic film is attached to the closing member, the elastic film swells to the liquid passage side due to an increase in the pressure of the space formed between the elastic film and the closing member, and the vibration characteristics of the elastic film change and vibrate. The absorption effect may be reduced, and when the amount of swelling of the elastic membrane toward the liquid passage is large, the flow of the liquid flowing through the liquid passage may be hindered. However, since the elastic membrane is bent at the side of the closing member until it comes into contact with at least the closing member and seals the space when attached to the closing member, the elastic membrane is attached to the closing member by attaching the elastic membrane to the closing member. Can be prevented from bulging to the liquid passage side, an excellent vibration absorption effect can be obtained, and the flow of the liquid in the liquid passage is not hindered.
[0008]
In particular, the elastic membrane is formed by forming a space portion between a cylindrical seal portion that is fitted and fixed to the outer periphery of a cylindrical mounting portion protruding from the inner end of the closure member, and the closure member. Since it is formed in a cap shape with a membrane portion connected to the end portion of the portion, it is easy to attach the elastic membrane to the closing member by fitting and fixing the seal portion to the cylindrical attachment portion. In addition, the contact area between the elastic membrane and the closing member can be increased to improve the sealing performance between the elastic membrane and the closing member. In addition, when the elastic membrane is attached to the closure member, the space portion is sealed when the tip of the seal portion is fitted to the attachment portion of the closure member, and the space portion increases as the degree of fitting of the seal portion to the attachment portion increases. Although the pressure of the elastic membrane is bent to the side of the closing member before being attached to the closing member, it is attached to the closing member even though the pressure in the space is greatly increased. As a result, it is possible to more effectively prevent the elastic membrane from expanding toward the liquid passage.
[0010]
Furthermore a second aspect of the present invention, pressing the vibration sound reducing device of claim 1, wherein, when assembling the elastic membrane to the closure member, the membrane portion of the elastic membrane as allowed to curvature in the closure member side by the pressing member In this state, the elastic membrane is assembled to the closing member, and the elastic membrane is assembled to the closing member in a state where the elastic membrane is forcibly bent to the space portion side. It is possible to avoid a large increase in the pressure in the space portion by excluding air at the bent portion.
[0011]
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.
[0012]
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 cross-sectional view showing a state before the elastic membrane is press-fitted into the closing member, and FIG. FIG. 6 is a diagram showing the vibration acceleration characteristics with respect to frequency in comparison with the prior art.
[0013]
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 _{1 to} 13 _{4 that} are vibration generating parts are provided in parallel, and the pistons 12 are slidably fitted to the cylinder parts 13 _{1 to} 13 ₄ , respectively. In this embodiment, the cylinder portions 13 _{1 to} 13 ₄ are formed by casting cylinder liners 15 into an inner wall portion 11a of the cylinder block 11, and the inner surface of the inner wall portion 11a is ground. It may be a thing. The engine body E is formed with a cooling water passage 14 as a liquid passage through which the cooling water flows, and the cooling water passage 14 is formed in the cylinder block 11 so as to surround each of the cylinder portions 13 _{1 to} 13 ₄ in common. The water channel portion 14a is included.
[0014]
Meanwhile, the piston 12 ... are present slight gaps between the outer and inner surfaces of the cylinder portions _131-134 of the piston 12 when the piston 12 ... vertical movement of the respective cylinder portions _131-134 within ₄ ... collides with the inner surface of the cylinder portion _131-134 to vibrate the cylinder portion _131-134, the vibration is transferred to the cooling water in the cooling water channel 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.
[0015]
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. Attached to the outer wall portion 11b of the cylinder block 11 at positions corresponding to the sleeve bore centers of the second and third cylinder portions 13 ₂ and 13 ₃ at intermediate positions along the arrangement direction of the portions 13 _{1 to} 13 _4. In the outer wall 11b of the cylinder block 11, through holes 17 are provided corresponding to the vibration absorbing means 16.
[0016]
The vibration absorbing means 16 has a closing member 18 that closes the through-hole 17 and one surface facing the water channel portion 14 a of the cooling water channel 14 and another surface facing the space portion 20 formed between the blocking member 18. And an elastic film 19 ₁ that is press-fitted and fixed to the closing member 18.
[0017]
Referring also to FIG. 3, a cylindrical boss portion 22 is integrally projected on the outer wall portion 11 b of the cylinder block 11, and a through-hole 17 having an inner end opened to the water channel portion 14 a is formed therein. An outer end is provided in the outer wall portion 11 b so as to open to the outer end of the boss portion 22, and an internal thread 23 is engraved on the inner surface of the through hole 17 at least from the outer end to the intermediate portion.
[0018]
The closing member 18 is an annular step surface between the male screw portion 24 screwed into the female screw 23, an overhanging flange portion 25 projecting radially outward from the outer end of the male screw portion 24, and the male screw portion 24. A restricting portion 27 is formed and a cylindrical mounting portion 26 that projects coaxially from the inner end of the male screw portion 24 is integrally formed, and is formed of a rigid metal material such as an aluminum alloy. An engaging recess 28 into which a tool for rotating the closing member 18 is inserted is provided at the outer end of the closing member 18 so as to have, for example, a hexagonal cross-sectional shape. The male screw portion 24 is screwed into the female screw 23 of the through hole 17 so as to sandwich the annular gasket 29 between the boss portion 22 and the boss portion 22.
[0019]
The elastic membrane 19 ₁ is made of, for example, ethylene-propylene rubber, and is a cylindrical seal portion 30 that is press-fitted to the outer periphery of the mounting portion 26 of the closing member 18 so that one end is brought into contact with the restriction portion 27. If, so as to form a space portion 20 between the film 31 ₁ connected to the other end of the sealing portion 30 is formed in a cap shape between the closure member 18.
[0020]
In addition, the seal portion 30 of the elastic film 19 ₁ is provided with a ring-shaped reinforcing member 32 made of metal, and the reinforcing member 32 is wrapped by the seal portion 30 so as to be entirely wrapped by the seal portion 30. 30 is provided.
[0021]
In such vibration absorbing means 16, the vibration absorbing means 16 is attached to the engine main body E so that the closing member 18 into which the elastic film 19 ₁ is press-fitted and fixed is screwed into the female screw 23 of the through hole 17. The elastic film 19 ₁ is set so as not to protrude from the inner surface of the outer wall portion 11 b in the cylinder block 11 into the cooling water channel 14.
[0022]
When Thus sealing portion 30 of the elastic film 19 ₁ is pressed into the outer periphery of the mounting portion 26 of the closure member 18, the space 20 formed between the membrane part 31 ₁ and the attachment portion 26 of the elastic membrane 19 ₁ In order to avoid the pressure from increasing and the membrane portion 31 swelling toward the cooling water channel 14, the membrane portion 31 ₁ of the elastic membrane 19 ₁ is blocked in a natural state where no external force is applied, as shown in FIG. It is formed in a shape bent on the member 18 side. As a result, the membrane portion 31 ₁ is deformed into a flat disk shape as shown in FIG. 3 in accordance with an increase in pressure in the space portion 20 where the seal portion 30 is press-fitted into the outer periphery of the mounting portion 26 and sealed. .
[0023]
Further, a retaining portion 33 that protrudes in an annular shape is integrally provided on the inner peripheral surface of the seal portion 30 in the elastic film 19 ₁ so as to be located inward of the reinforcing member 32. On the outer surface of the attachment portion 26, an annular recess 34 is provided for elastically engaging the retaining portion 33.
[0024]
Although a gasket 29 is interposed between the closing member 18 and the boss portion 22, the outer surface of the seal portion 30 in the elastic film 19 ₁ is the inner surface of the through-hole 17 when the vibration absorbing means 16 is attached to the engine body E. It is also possible to omit the gasket 29 if it is set so as to be in close contact.
[0025]
By the way, it is desirable that the positions of the through holes 17 and the vibration absorbing means 16 be close to the positions at which the piston 12 strikes the inner surfaces of the second and third cylinder portions 13 ₂ and 13 ₃ , and the slap vibration with respect to the crank angle. Is known to be within 25 degrees before and after the top dead center of the piston 12, and when A is the sum of the piston displacement and the axial length of the piston 12 at 25 degrees before and after the top dead center Further, it is desirable that the through hole 17 and the vibration absorbing means 16 are disposed in the range A from the upper surface of the cylinder block 11.
[0026]
Further, according to the experiment by the present inventor, the velocity amplitude of vibration accompanying the striking of the cylinder portions 13 _{1 to} 13 _{4 from} the piston 12 is shown in FIG. 5 along the arrangement direction of the cylinder portions 13 _{1 to} 13 ₄ . The velocity amplitude is changed at a portion corresponding to the sleeve bore center of the second and third cylinder portions 13 ₂ and 13 ₃ , which is an intermediate portion along the arrangement direction of the cylinder portions 13 _{1 to} 13 _4. Becomes larger. Therefore, the through-hole 17 and the vibration absorbing means 16 are the second and third cylinder parts 13 ₂ , 13 _{3 in} a state where the cylinder block 11 is viewed from the side perpendicular to the arrangement direction of the cylinder parts 13 _{1 to} 13 _4. It 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.
[0027]
Next, to explain the action of this first embodiment, by minute gap between the inner surface of the pistons 12 ... outer surface and the cylinder portions _131-134 is present, the inner surface of the cylinder portion _131-134 When the pistons 12 collide with each other to vibrate the cylinder parts 13 _{1 to} 13 ₄ , the vibrations are transmitted to the incompressible cooling water in the cooling water passage 14 to induce a pressure change of the cooling water. Become. However, a through 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 a vibration absorbing means 16 is attached so as to close the through hole 17. The vibration absorbing means 16 has a closing member 18 that closes the through-hole 17 and one surface facing the water channel portion 14 a of the liquid passage 14 and the other surface facing the space portion 20 formed between the closing member 18. And an elastic film 19 ₁ fixed to the closing member 18. Therefore, the pressure fluctuation of the cooling water will be absorbed by the deflection of the membrane portion 31 ₁ of the elastic membrane 19 _1, excitation force acting can be effectively reduced on the outer wall portion 11b of the cylinder block 11 from the cooling water . Moreover, since the space 20 facing the other surface of the elastic membrane 19 ₁ is covered with the closing member 18, the sound due to the vibration of the elastic membrane 19 ₁ is not emitted from the closing member 18 to the outside but is emitted from the cylinder block 11. Piston slap noise can be effectively reduced.
[0028]
Furthermore, since the vibration absorbing means 16 is attached to a part of the outer wall surface of the cylinder block 11, an increase in the weight of the cylinder block 11, that is, the engine body E due to the attachment of the vibration absorbing means 16 can be suppressed as much as possible. Moreover, the closing member 18 is screwed into the engine main body E, and the attaching / detaching operation of the vibration absorbing means 16 with respect to the engine main body E is extremely easy, so that the elastic membrane 19 ₁ can be easily replaced and maintained.
[0029]
The elastic membrane 19 ₁ is connected to the end portion of the seal portion 30 by forming a space portion 20 between the cylindrical seal portion 30 that is press-fitted into the outer periphery of the cylindrical attachment portion 26 and the closing member 18. The elastic film 19 ₁ can be easily attached to the closing member 18, and the contact area between the elastic film 19 ₁ and the attaching part 26 can be relatively small. As a result, the sealing performance can be improved. Moreover pressed seal portion 30 is in the closing member 18, because it is fixed, to avoid that the sealing property decreases by the water pressure and the elastic film 19 ₁ of the degradation of the cooling water channel 14, to the elastic film 19 ₁ of the closure member 18 A fixed state can be reliably maintained. Further, since the seal portion 30 of the elastic membrane 19 ₁ is provided with the ring-shaped reinforcing member 32, the seal portion 30 of the elastic membrane 19 ₁ , that is, the press-fitting portion into the closing member 18 is reinforced by the reinforcing member 32. . Thus it is possible to to to more easily press-fitting operation to retain the cylindrical shape of the seal portion 30 upon stuffing operation of the elastic membrane 19 _1, to ensure the close contact state of the seal portion 30 to the outer periphery of the mounting portion 26 It can maintain and improve a sealing performance. In addition, since the reinforcing member 32 is provided in the sealing portion 30 so that the entire reinforcing member 32 is wrapped by the sealing portion 30, the reinforcing member 32 is reliably prevented from falling off the elastic film 19 _1. can do.
[0030]
Further, a retaining portion 33 is provided on the inner surface of the seal portion 30 so as to be located inside the reinforcing member 32, and the retaining portion 33 is elastically engaged with the annular recess 34 of the mounting portion 26. Therefore, the elastic film 19 ₁ can be prevented from falling off from the closing member 18, and the elastic film 19 ₁ can be securely pressed into and fixed to the closing member 18. This engagement state can be firmly maintained by the reinforcing member 32.
[0031]
In addition, when the sealing portion 30 of the elastic film 19 ₁ is press-fitted into the outer periphery of the mounting portion 26, the closing member 18 is provided with a restricting portion 27 that restricts the moving end of the seal portion 30 in the press-fitting direction. press-fitting of the seal portion 30 because it is sufficient press-fitting the seal portion 30 to be regulated at 27, it is possible to sufficiently secure the sealing property of the elastic membrane 19 ₁ while improving the workability of the press-fitting operation.
[0032]
Furthermore the elastic membrane 19 _1, since the inner surface of the outer wall portion 11b of the cylinder block 11 does not project into the cooling water channel 14, as much as possible to avoid that the flow of cooling water in the cooling water passage 14 by the elastic film 19 ₁ is inhibited Therefore, it is possible to smoothly flow the cooling water in the cooling water passage 14 and maintain the cooling performance to the same level as that of a conventional water-cooled internal combustion engine that is not equipped with the vibration absorbing means 16.
[0033]
By the way, when the elastic film 19 ₁ is attached to the closing member 18, the elastic film 19 ₁ swells toward the cooling water channel 14 due to an increase in pressure in the space 20 formed between the elastic film 19 ₁ and the closing member 18. The vibration characteristics of the elastic membrane 19 ₁ may change and the vibration absorption effect may decrease, and when the amount of swelling of the elastic membrane 19 ₁ toward the cooling water channel 14 is large, the circulation of the cooling water flowing through the cooling water channel 14 May be hindered. However, as shown in FIG. 4, the film portion 31 ₁ of the elastic film 19 ₁ is bent in the natural state where no external force is applied, that is, before the elastic film 19 ₁ is attached to the closing member 18. since a shape, even if the pressure of the space 20 which is sealed upon attachment to the elastic film 19 ₁ to the closing member 18 is increased, the elastic film 19 ₁ is to prevent the bulge cooling water channel 14 side And an excellent vibration absorption effect can be obtained, and the circulation of the cooling water in the cooling water channel 14 is not hindered.
[0034]
Here, without the shows the result of verifying the vibration acceleration of the outer wall 11b of the cylinder block 11 at a portion corresponding to the third cylinder portion 13 _3, which is shown in FIG. 6, the vibration absorbing means 16 Whereas the conventional one 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 piston slap is provided by the vibration absorbing means 16 according to the present invention. It is clear that the sound can be effectively reduced.
[0035]
7 and 8 show a second embodiment of the present invention. FIG. 7 is a longitudinal sectional view showing a state where an external force is not applied to the elastic membrane before press-fitting into the closing member, and FIG. 8 shows the closing member. It is a longitudinal cross-sectional view which shows the state which is applying the pressing force by a pressing member to an elastic film before press-fitting.
[0036]
Press fitting the closing member 18, the elastic film 19 ₂ is fixed, a cylindrical sealing portion 30 which is press-fitted on the outer periphery of the mounting portion 26 of the closure member 18, the space 20 (see FIG. 3 between the closing member 18 ) by the film portion 31 ₂ continuous to the other end of the sealing portion 30 so as to form a, is formed on the cap-shaped.
[0037]
Such elastic film 19 ₂ is pressed into the closure member 18 is pressed by the pressing member 35, which is fixed, moreover membrane portion 31 ₂ of the elastic membrane 19 _2, natural without addition of external force by the pressing member 35 In such a state, as shown in FIG. 7, it is formed in a flat disk shape. The pressing member 35 has a spherical pressing surface 35a protruding toward the closing member 35. When the elastic film 19 ₂ is pressed by the pressing member 35, the film portion 31 ₂ of the elastic film 19 ₂ is used. Is bent toward the closing member 18 as shown in FIG. That is, the elastic film 19 _2, while the film unit 31 ₂ is pressed by the pressing member 35 so that curved to the closing member 18 side, will be assembled to the closure member 18.
[0038]
According to the second embodiment, the elastic film 19 ₂ is assembled to the closing member 18 in a state in which the elastic film 19 ₂ is forcibly bent toward the closing member 18, so that the space portion 20 of the elastic film 19 ₂ (see FIG. 3). It is possible to avoid a large increase in the pressure of the space 20 by excluding air at the bent portion toward the side, and the elastic film 19 ₂ protrudes toward the cooling water channel 14 after being assembled to the closing member 18. Thus, it is possible to prevent bending, and the same effects as in the first embodiment can be obtained.
[0039]
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.
[0040]
For example, in the above embodiment, the case where the present invention is applied to a water-cooled internal combustion engine has been described. However, the present invention relates to vibration radiated from a passage forming body that forms a liquid passage that at least partially faces the vibration generating portion. It can be widely implemented as an apparatus for reducing sound.
[0041]
【The invention's effect】
As described above, according to the first aspect of the present invention, the vibration transmitted from the vibration generating portion through the liquid in the liquid passage is absorbed by the bending of the elastic film, and acts on the passage forming body from the liquid. The excitation force is effectively reduced, and the vibration sound radiated from the passage forming body is reduced, and the increase in the weight of the passage forming body due to the attachment of the vibration absorbing means can be suppressed as much as possible. In addition, since the elastic film is bent toward the closing member until it comes into contact with at least the closing member and seals the space when attached to the closing member, the elastic film is attached to the closing member by attaching the elastic film to the closing member. Can be prevented from bulging to the liquid passage side, an excellent vibration absorption effect can be obtained, and the flow of the liquid in the liquid passage is not hindered.
[0042]
In particular, the elastic membrane is formed by forming a space portion between a cylindrical seal portion that is fitted and fixed to the outer periphery of a cylindrical mounting portion protruding from the inner end of the closure member, and the closure member. Since it is formed in a cap shape with a film part connected to the end of the part, it is possible to facilitate the attachment to the attachment part of the elastic film and improve the sealing performance between the elastic film and the closing member, In addition, when the elastic membrane is attached to the closure member, the space portion is sealed when the tip of the seal portion is fitted to the attachment portion of the closure member, and the space portion increases as the degree of fitting of the seal portion to the attachment portion increases. However, the elastic membrane can be effectively prevented from swelling to the liquid passage side by being attached to the closing member in spite of such an increase in the pressure in the space.
[0044]
Further, in particular , according to the invention of claim 2 , the elastic membrane is assembled to the closing member in a state where the elastic membrane is forcibly bent to the space portion side, and the air is bent at the bent portion toward the space portion of the elastic membrane. It can be avoided that the pressure in the space increases greatly.
[Brief description of the drawings]
FIG. 1 is a perspective view of a cylinder block of a four-cylinder water-cooled internal combustion engine according to a first embodiment.
2 is an enlarged sectional view taken along line 2-2 of FIG.
FIG. 3 is an enlarged view of a main part of FIG. 2;
FIG. 4 is a cross-sectional view showing a state before press-fitting an elastic membrane into a closing member.
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 longitudinal sectional view showing a state where an external force is not applied to the elastic membrane before press-fitting into the closing member in the second embodiment.
FIG. 8 is a longitudinal sectional view showing a state in which a pressing force by the pressing member is applied to the elastic film before press-fitting into the closing member.
[Explanation of symbols]
11b: outer wall parts 13 _{1 to} 13 ₄ ... cylinder part 14 as vibration generating part ... cooling water channel 16 as liquid passage ... vibration absorbing means 17 ... through hole 18 ... blocking member 19 ₁ , 19 ₂ ... Elastic membrane 20... Space portion 26. Mounting portion 30... Seal portion 31 ₁ , 31 _2. The body of the engine as a body

Claims (2)

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 ) In the vibration noise reducing device provided with the vibration absorbing means (16) for absorbing the vibration transmitted through the liquid in the
The vibration absorbing means (16) opens the inner end of the liquid passage (14) and closes the through-hole (17) provided in the outer wall portion (11b) of the passage forming body (E) to close the outer wall portion (11b). ) Attached to the closing member (18) with both sides facing the space (20) and the liquid passage (14) formed between the closing member (18) attached to the closing member (18). It is composed of elastic membranes (19 ₁ , 19 ₂ ),
The elastic membrane (19 ₁ , 19 ₂ ) is fitted into and fixed to the outer periphery of a cylindrical mounting portion (26) protruding from the inner end of the closing member (18), and is a cylindrical seal portion (30). And a film part (31 ₁ , 31 ₂ ) formed between the end part of the seal part (30) by forming a space part (20) between the sealing member (18) and the cap member (18). In addition , at the time of attachment to the closing member (18), the shape is bent toward the closing member (18) until at least immediately before contacting the closing member (18) and sealing the space (20). A vibration noise reduction device. In vibration sound reducing device of claim 1, wherein, when assembling the elastic membrane (19 ₂₎ to the closing member (18), the pressing member (35) in the closure member (18) elastically as it allowed to curved in side membrane ( An elastic film assembling method for a vibration noise reducing device, wherein the elastic film (19 ₂ ) is assembled to the closing member (18) in a state where the film part (31 ₂ ) of 19 ₂ ) is pressed.

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