JP3314018B2 - Vibration noise reduction device and vibration noise reduction device for water-cooled internal combustion engine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to absorbing a vibration transmitted from a vibration generating unit through a liquid in a liquid passage to a passage forming body forming a liquid passage facing at least a part of the vibration generating unit. The present invention relates to a vibration noise reduction device provided with a vibration absorbing means, and more particularly to a vibration noise reduction device suitably applied to a water-cooled internal combustion engine in which a cooling water passage including a water passage portion surrounding a cylinder portion as a vibration generation portion is provided in an engine body. Related to the device.

[0002]

2. Description of the Related Art In a water-cooled internal combustion engine, in order to reduce the piston slap noise caused by the collision of a piston with an inner surface of a cylinder portion, a method of increasing the wall thickness of the cylinder portion to suppress the vibration amplitude, A technique of increasing the thickness of the outer wall of the cylinder block to suppress the vibration amplitude has been conventionally used.

As a structure for suppressing the vibration of incompressible cooling water existing in a cooling water passage, Japanese Utility Model Application Laid-Open No. 53-6881 has been proposed.
As disclosed in Japanese Patent Application Publication No. 4 (1993) -104, there is known a structure in which a sound insulation layer is provided outside a cooling water channel in a cylinder block via a partition.

[0004]

However, in the above methods, the weight of the engine body increases due to the increase in the thickness of the cylinder portion and the cylinder block. In the above structure, the cooling water passage and the sound insulation layer are arranged via a partition wall, so that the structure is complicated, and the structure is complicated, so that the production is difficult, the production cost is increased, and the weight of the engine body is increased. It will also be.

Accordingly, the applicant of the present invention has proposed a vibration absorbing device provided with a through-hole in the outer wall of the engine body facing the cooling water channel, and having an elastic film having one surface facing the cooling water channel and the other surface facing the space. Japanese Patent Application No. 8-351288 has already proposed a vibration noise reduction device for a water-cooled internal combustion engine in which the means is mounted on the outer wall surface of the engine body so as to close the through hole.

According to this proposed technique, the pressure fluctuation of the cooling water is absorbed by the bending of the elastic film having one surface facing the cooling water passage, and the vibration force acting on the outer wall of the engine body from the cooling water. Is effectively reduced, and the piston slap noise radiated from the engine body is reduced without increasing the weight of the engine body.

However, in the above proposed technique, the periphery of the elastic film is fixed to a member attached to the engine body so as to close the through hole by baking or the like. It is difficult to ensure a sufficient seal between the cooling water channel and the space due to the deterioration of the water pressure and the elastic film of the water channel. In addition, it is conceivable to attach the peripheral edge of the elastic film to a member attached to the engine body, but in such a case, it is difficult to ensure sufficient sealing performance.

The present invention has been made in view of the above circumstances, and is intended to effectively reduce vibration noise such as piston slap noise with a simple structure that does not increase the weight of the passage forming body. It is another object of the present invention to provide a vibration noise reduction device capable of ensuring a sufficient sealing property.

[0009]

In order to achieve the above object, the invention according to the first aspect of the present invention is directed to a method for forming a liquid passage which forms at least a part of a vibration generation section, the vibration generation section. A vibration absorbing means for absorbing vibration transmitted from the liquid through the liquid in the liquid passage, wherein a through hole having an inner end opened in the liquid passage is provided in an outer wall of the passage forming body. The through hole is closed and attached to the outer wall, and a cylindrical attachment portion is provided at the inner end.
A projecting closing member, an elastic film having one surface facing the liquid passage and facing the other surface in a space formed between the closing member, and a press fit into the outer periphery of the mounting portion of the closing member.
The vibration absorbing means is constituted by the holding member for holding the elastic membrane between the closing member and the closing member.

According to the structure of the first aspect of the present invention, the vibration generated in the vibration generating section induces the vibration of the liquid in the liquid passage, but one surface is exposed to the liquid passage. Fluctuation of the pressure of the liquid is absorbed by the deflection of the elastic film, and the exciting 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. Become. 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 minimize the increase in weight of the passage forming body due to the attachment of the vibration absorbing means. The elastic membrane is located outside the passage forming body.
A blocking member that blocks the through hole in the wall and a protruding
It is held between a holding member that is pressed into the outer periphery of the installed cylindrical mounting part, and closes the elastic film by avoiding a decrease in sealing performance due to the liquid pressure in the liquid passage and deterioration of the elastic film. The elastic film can be reliably held between the member and the holding member, and a sufficient sealing performance can be ensured as compared with a structure in which the elastic film is directly fixed to the closing member by baking or bonding.

According to a second aspect of the present invention, a cooling water passage including a water passage surrounding the cylinder is formed in an engine body including a cylinder block provided with a cylinder in which a piston is slidably fitted. In addition, in a vibration noise reduction device for a water-cooled internal combustion engine provided with vibration absorbing means for absorbing vibration transmitted from the cylinder portion via cooling water in a cooling water passage, the cooling water passage has an inner end opened at a through hole. A hole is provided in an outer wall portion of the engine body, the through hole is closed and screwed into the through hole, and a cylindrical hole is formed in the inner end.
A closing member having a mounting portion projecting therefrom; an elastic film having one surface facing the cooling water passage and facing the other surface in a space formed between the closing member; and the mounting portion of the closing member.
The vibration absorbing means is constituted by a holding member that press-fits the outer periphery and holds the elastic film between the closing member and the closing member.

According to the structure of the second aspect of the present invention, the vibration of the cylinder caused by the collision of the piston with the inner surface of the cylinder induces the vibration of the cooling water in the cooling water passage. However, the pressure fluctuation of the cooling water is absorbed by the bending of the elastic film whose one surface faces the cooling water passage, and the exciting force acting on the outer wall of the engine body from the cooling water is effectively reduced. Thus, the piston slap noise radiated from the engine body is reduced. Moreover, since the vibration absorbing means is attached to a part of the outer wall side of the engine main body, it is possible to minimize the increase in the weight of the engine main body due to the mounting of the vibration absorbing means. The elastic membrane is, the machine
A blocking member that closes the through hole in the outer wall of the Seki body, and the
Holding part that is pressed into the outer periphery of the cylindrical mounting part that protrudes from the inner end
The elastic film can be securely held between the closing member and the holding member by avoiding a decrease in sealing performance due to the water pressure of the cooling water passage and the deterioration of the elastic film. Sufficient sealing performance can be ensured as compared to a structure in which the closing member is directly fixed to the closing member by baking or bonding. Further, the closing member is screwed into the through hole, so that the attachment / detachment operation of the vibration absorbing means to / from the engine body is easy.

[0013] The invention described in claim 3 is the above-mentioned claim 1 or
2. In addition to the configuration of the invention described in 2, the holding member is
Closing the outer peripheral portion of the conductive film between the closing member and the closing member
Is press-fitted to the outer periphery of the mounting portion, and
Restricting the moving end of the holding member in the press-fitting direction with respect to the closing member
And a restricting section,
According to this, it is possible to securely hold the elastic membrane to the closing member.
And until the press-fitting of the holding member is
Since it is sufficient to press-fit the holding member, the workability of press-fitting work is improved.
The sealing property of the elastic film can be sufficiently secured while
You.

[0014] The invention described in claim 4 is the first and second aspects of the present invention.
Or 3 in addition to the configuration of the invention described, prior Symbol elastic membrane, the <br/> an endless sealing portion in contact with the front end surface of the mounting portion, the sealing portion is formed to be thinner than the seal portion And a membrane portion integrally formed with a step on the inner periphery of the seal portion, and engaged with the inner periphery of the seal portion by a holding member attached to the closing member with the seal portion sandwiched between the distal end of the attachment portion and the holding portion. And a positioning portion for positioning the elastic film on a plane perpendicular to the axis of the mounting portion. According to such a configuration, the sealing portion of the elastic film is provided between the mounting portion and the holding member. It is accurately positioned and sandwiched, so that the sealing performance can be more sufficiently secured and the vibration absorption characteristics can be improved.

[0015] The invention according to claim 5 provides the above-mentioned claims 1 and 2.
Or 3 in addition to the configuration of the invention described, prior Symbol elastic film, an endless sealing portion in contact with the front end surface of the <br/> mounting portion, the outer periphery of the seal portion of the annular outwardly projecting A holding member attached to the closing member with the lip portion sandwiched between the sealing portion and the tip of the mounting portion, the holding member being in contact with the outer periphery of the lip portion in a plane perpendicular to the axis of the mounting portion. According to such a configuration, the cylindrical portion for positioning the elastic film is provided, and the seal portion of the elastic film is accurately positioned and sandwiched between the mounting portion and the holding member. In addition, the vibration absorption characteristics can be improved by sufficiently securing the elasticity, and the burrs generated on the outer periphery of the elastic film at the time of forming the elastic film can be effectively used as the lip portion. Eliminating work is not required.

[0016] The invention of claim 6 provides the above-mentioned claims 1 and 2
Or , in addition to the configuration of the invention described in 3 above, the closing member has an annular engaging portion that engages with the elastic film over the entire circumference so as to perform positioning of the elastic film on a plane orthogonal to the axis of the through hole. According to this structure, the seal portion of the elastic film is accurately positioned and sandwiched between the mounting portion and the holding member, so that the sealing performance is more sufficiently secured and the vibration is absorbed. Characteristics can be improved.

The invention according to claim 7 is the invention according to claims 1 and 2.
Or in addition to the configuration of the invention described in 3, the fitting circle of the elastic membrane
A cylindrical portion is provided at the tip of the mounting portion of the closing member.
It is characterized by being fitted,
If the elastic membrane falls off between the holding member and the closing member,
Effectively blocked.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described based on embodiments of the present invention shown in the accompanying drawings.

1 to 5 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, and FIG. 2 is an enlarged sectional view taken along line 2-2 of FIG. Figure,
FIG. 3 is an enlarged view of a main part of FIG. 2, FIG. 4 is a diagram showing a vibration mode of an outer wall surface of a cylinder block along an arrangement direction of each cylinder portion, and FIG. is there.

Referring first to FIGS. 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 11, first to fourth cylinder unit _131-134 are provided in parallel a vibration generating unit, the piston 12 ... we are engaged respectively slidably in the cylinders portions _131-134 . These cylinder portions _131-134 are
In this embodiment, the inner wall portion 1 of the cylinder block 11 is provided.
Although the cylinder liners 15 are cast into 1a, the inner surface of the inner wall 11a may be ground. The also engine body E, the cooling water passage 14 as a liquid passage for circulating the liquid is formed, the cooling water channel 14 is formed in the cylinder block 11 so as to surround the respective cylinder portions _131-134 in common Waterway part 1
4a.

[0021] Incidentally, the piston 12 ... are present slight gaps between the outer and inner surfaces of the cylinder portions _131-134 of the piston 12 ... vertical movement of the respective cylinder portions _131-134 within ₄ Sometimes pistons 12 are cylinder parts 1
3 _{1-13 4} collides with the inner surface cylinder unit _131-134
4 is vibrated, and the vibration is transmitted to the cooling water in the cooling water passage 14. Since the cooling water is incompressible,
Even a slight vibration causes a pressure change, and the cooling water passage 14
When a vibration force is applied to the outer wall portion 11b of the cylinder block 11 facing the pressure due to a change in the pressure of the cooling water, the outer wall portion 11b vibrates, and the piston slap sound is emitted to the outside.

Therefore, vibration absorbing means 16 ₁ for absorbing the vibration of the cooling water in the cooling water passage 14 and suppressing the application of the vibrating force to the outer wall portion 11b of the cylinder block 11 as much as possible to reduce the piston slap noise. but the cylinders 13 ₁ ~
13 second and third in an intermediate position along the _fourth arrangement direction
The cylinder blocks 13 ₂ and 13 ₃ are attached to the outer wall 11b of the cylinder block 11 at positions corresponding to the sleeve bore centers, respectively.
The through-holes 17 are provided in the outer wall portion 11b of each of the plurality of vibration-absorbing units 16 ₁ .

The vibration absorbing means 16 ₁ is formed between the closing member 18 ₁ is attached to the outer wall portion 11b closes the through hole 17, and the closing member ₁₈₁ together to face one surface waterways portion 14a of the cooling water channel 14 comprising the the space 20 and the elastic film 19 ₁ for exposing the other surface, and a holding member 21 ₁ for holding the elastic membrane 19 ₁ between the closing member 18 ₁ with attached to closing member 18 _1.

Referring also to FIG. 3, a cylindrical boss 22 is integrally formed on the outer wall 11b of the cylinder block 11, and a through hole 17 having an inner end opened to the water passage 14a. Is provided on the outer wall portion 11b so that the outer end is open to the outer end of the boss portion 22, and a female screw 23 is formed on the inner surface of the through hole 17 at least from the outer end to the intermediate portion. Is done.

The closing member 18 ₁ has a male thread portion 24 to be screwed into the internal thread 23, engaging a projecting flange portion 25 that overhangs radially outward from the outer end of the male screw portion 24, the rotation operation tool such as a spanner For example, an engaging operation portion 26 which is formed in a substantially hexagonal shape and protrudes outward from the center of the overhanging flange portion 25 and a male screw portion 24 are formed with a regulating portion 28 which is an annular step surface. and has a cylindrical mounting portion 27 ₁ which protrudes coaxially from the inner end of the male screw portion 24 integrally, which are formed of a metal material such as aluminum alloy has rigidity, a projecting flange portion 25 It is screwed into the female screw 23 of the through hole 17 so that the annular gasket 33 is sandwiched between the boss portion 22. Tubular mounting portion 27 ₁ in a mounted state of Thus to the closing member 18 ₁ of the boss portion 22 through hole 1
7 and coaxial.

The elastic film 19 _1, because of its durability, for example cloth, rubber reinforced with synthetic fibers or glass fibers are those made of synthetic resin or metal, the end surface of the mounting portion 27 ₁ The seal portion 29 includes a thick ring-shaped seal portion 29 that comes into contact with the seal portion 29, and a film portion 30 that is formed to be thinner than the seal portion 29 and that is integrally formed with the inner periphery of the seal portion 29 with a step.

The holding member 21 _1, closing one end member 18 ₁
A cylindrical portion 31 which is press-fitted on the outer periphery of the mounting portion 27 ₁ to abut the restricting portion 28 of the clamping Jitsuba portion 32 which overhangs radially inwardly from the other end of the cylindrical portion 31 integrally includes , A metal, for example, an iron-based material such as JIS SP or the like.
Set when pressed into the mounting portion 27 _1, to the extent that sandwiched and pressed between the mounting portion 27 ₁ of the front end and the clamping flange portion 32 so as crushed seal portion 29 of the elastic membrane 19 ₁ by a set squeeze until it abuts against the The set crushing allowance is set to, for example, 25% of the thickness of the seal portion 29.

[0028] In the mounting state of the vibration absorbing means 16 ₁ of the engine body E, narrow Jitsuba portion 32 and the elastic film 19 _first holding member 21 _1, the outer wall 1 of the cylinder block 11
It is set so that it does not protrude into the cooling water passage 14 from the inner surface of 1b.

By the way, the arrangement position of the through hole 17 and the vibration absorbing means 16 _1, it is desirable piston 12 is close to the position to hit the second and third cylinder portions 13 _2, 13 ₃ of the inner surface, the crank It is known that the timing of the slap vibration with respect to the angle is within 25 degrees before and after the top dead center of the piston 12,
The sum of the axial length of the piston displacement and the piston 12 at 5 degrees when the A, upper surface through a range of A from the hole 17 and the vibration absorbing means 16 ₁ of the cylinder block 11 that is disposed desirable.

[0030] According to the experiments conducted by the present inventors, velocity amplitude of the accompanying vibration to blow from the piston 12 of each cylinder unit _131-134 is along the arrangement direction of the cylinder portion _131-134 Te is intended to vary as shown in Figure 4, parts corresponding to the respective cylinder portions _131-134 second and third cylinder portion 13 ₂ which is an intermediate portion along the arrangement direction of _4, 13 ₃ of the sleeve bore center Increases the speed amplitude. Therefore, the through-hole 17 and the vibration absorbing means 16 ₁ is in a state in which from the side perpendicular to the arrangement direction of the cylinder portion _131-134 viewed cylinder block 11, the second and third
At the portion corresponding to the cylinder portion 13 _2, 13 ₃ of the sleeve bore center, it is desirable to be respectively disposed in the outer wall 11b of the cylinder block 11.

Next, the operation of the first embodiment will be described.
By minute gap exists between _{1-13 4} inner surface,
When the inner surface of the cylinder portion _131-134 piston 12 ... vibrates the respective cylinder portions _131-134 collide,
The vibration is transmitted to the incompressible cooling water in the cooling water passage 14 and induces a pressure change of the cooling water. However, the outer wall 11b of the cylinder block 11 at a portion facing the water passage portion 14a of the cooling water channel 14, with a through hole 17 is provided, mounted vibration absorbing means 16 ₁ so as to block the through hole 17 , The vibration absorbing means 16
Reference numeral ₁ denotes a closing member 181 for closing the through hole 17 and a closing member ₁ having one surface facing the water passage portion 14a of the liquid passage 14.
8 ₁ and the elastic film 19 ₁ for exposing the other surface in the space 20 formed between the holding member for holding the elastic membrane 19 ₁ between the closing member 18 ₁ with attached to closing member 18 ₁ 21 ₁ is provided. Therefore, the pressure fluctuation of the cooling water will be absorbed by the deflection of the membrane portion 30 of the elastic film 19 _1, the vibrating force acting from the cooling water to the outer wall 11b of the cylinder block 11 is effectively reduced. Moreover, since the space portion 20 facing the other surface of the elastic film 19 ₁ is covered with a closing member 18 _1, it no sound by the vibration of the elastic membrane 19 ₁ is radiated to the outside from the closing member 18 _1, the cylinder block 11 The radiated piston slap noise can be effectively reduced.

Furthermore the vibration absorbing means 16 ₁ to a part of the outer wall side of the cylinder block 11 is intended to be mounted, to suppress the increase in weight of the cylinder block 11 i.e. the engine body E by mounting the vibration absorbing means 16 ₁ as small as possible Can be. Moreover the closing member _181, the through-holes 17
To is what is screwed a detachable operation is very easy for the vibration absorbing means 16 ₁ of the engine body E, the elastic membrane 1
9 ₁ replacement and maintenance can be easily performed.

Since the elastic film 19 ₁ is held between the closing member 18 ₁ and the holding member 21 _1, it is possible to prevent the sealing performance from being deteriorated due to the water pressure of the cooling water passage 14 and the deterioration of the elastic film 19 _1. Then, the elastic film 19 ₁ is attached to the holding member 21.
₁ can be reliably held, and it is possible to obtain a superior sealing property as compared with the case where the elastic film is directly fixed to the closing member by baking or bonding.

[0034] Moreover the holding member 21 ₁ is pressed into the mounting portion 27 ₁ is sandwiched between the mounting portion 27 ₁ of the elastic membrane 19 _first seal portion 29 a closing member 18 ₁ is the outer peripheral portion, the closing member 18 the _1, since the restricting portion 28 for restricting the moving end of the press-fitting direction with respect to the closing member 18 _first holding member 21 ₁ is provided, can be reliably held to the closure member 18 ₁ of the elastic membrane 19 ₁ together becomes, it is sufficient to press-fitting the holding member 21 ₁ to the press-fitting of the holding member 21 ₁ in restricting portion 28 is restricted, the elastic membrane 1 while improving the workability of the press-fitting operation
It is possible to sufficiently ensure the 9 ₁ sealability.

The further holding member 21 _first clamping Jitsuba portion 32 and the elastic film 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,
The cooling water passage 14 is formed by the holding member 21 ₁ and the elastic film 19 _1.
The flow of cooling water is inhibited can be avoided as much as possible of a medium, the flow of cooling water in the cooling water passage 14 can be smoothly, the conventional vibration absorbing means 16 ₁ is not equipped with The cooling performance can be maintained at the same level as a water-cooled internal combustion engine.

[0036] Here, when showing the result of verification of 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. 5, the vibration absorbing means 16 Whereas the conventional _one having no ₁ is relatively high as shown by the broken line, the one according to the present invention has the acceleration effectively reduced as shown by the solid line and the vibration absorbing means according to the present invention 16 it is apparent _{that 1} by may reduce piston slap sound effectively.

FIG. 6 shows a second embodiment of the present invention, in which parts corresponding to those in the first embodiment are denoted by the same reference numerals.

The vibration absorbing means 1 is closed so as to close a through hole 17 provided in the outer wall 11b of the cylinder block 11.
6 ₂ is attached to the outer wall 11b of the cylinder block 11, the vibration absorbing unit 16 _2, the through the closing member 18 ₁ for closing the hole 17, the one side water passage portion 14a of the liquid passage 14
The elastic membrane 19 ₁ for exposing the other surface in the space 20 formed between the closure member 18 ₁ causes face, the closure member 1
With it attached to ₈₁ and a holding member 21 ₂ that holds the elastic membrane 19 ₁ between the closing member 18 _1.

The holding member 21 _2, closing one end member 18 ₁
Regulating portion to abut 28 and the cylindrical portion 31 which is press-fitted on the outer periphery of the mounting portion 27 ₁ of the closing member _181, the elastic membrane 1 from the other end of the cylindrical portion 31 Te projecting radially inwardly
9 and ₁ narrow Jitsuba portion 32 sandwiched and pressed between the tip of the sealing portion 29 of the mounting portion 27 _1, the elasticity of a plane perpendicular to the axis of the mounting portion 27 ₁ engaged with the inner periphery of the seal portion 29 Membrane 1
9 ₁ of the positioning unit 34 to perform positioning has integrally, which is formed of a metal, the positioning unit 34
Is formed by slightly bending the inner peripheral portion of the holding flange 32 inward in the axial direction.

[0040] According to the second embodiment, on which exhibit the same effects as in the first embodiment, the elastic film 19 ₁ of the sealing portion 2
9 is accurately positioned and sandwiched between the mounting portion 27 ₁ and the holding member 21 ₂ , so that the sealing performance of the sealing portion 29 can be more sufficiently secured and the vibration absorbing characteristics can be improved.

FIG. 7 shows a third embodiment of the present invention, and portions corresponding to the above-described embodiments are denoted by the same reference numerals.

The vibration absorbing means 1 is closed by closing a through hole 17 provided in the outer wall 11b of the cylinder block 11.
6 ₃ is attached to the outer wall 11b of the cylinder block 11, the vibration absorbing means 16 _3, the through the closing member 18 ₁ for closing the hole 17, the one side water passage portion 14a of the liquid passage 14
An elastic membrane 19 ₂ for exposing the other surface in the space 20 formed between the closure member 18 ₁ causes face, the closure member 1
With it attached to ₈₁ and a holding member 21 ₂ that holds the elastic membrane 19 ₂ between the closing member 18 _1.

The elastic membrane 19 ₂ has a thick ring-shaped seal portion 29 in contact with the front end surface of the mounting portion 27 ₁ of the closing member 18 _1, and is formed to be thinner than the seal portion 29 of the sealing portion 29 the film portion 30 integrally connected to the inner peripheral forms a step, from the outer periphery of the sealing portion 29 are those provided with an annular lip 35 projecting outwardly integrally mounting portion 27 of the holding member 21 ₁ by the lip portion 35 on the inner surface of the cylindrical portion 31 which is press-fitted into the _first outer periphery are in contact, the elastic membrane 1 in a plane perpendicular to the axis of the mounting portion 27 ₁
So that the 9 _second positioning is performed.

[0044] According to the third embodiment, on which exhibit the same effects as in the first embodiment, the elastic film 19 ₂ of the sealing portion 2
9 is accurately positioned and sandwiched between the mounting portion 27 ₁ and the holding member 21 ₁ , whereby the sealing performance of the sealing portion 29 can be more sufficiently ensured, and the vibration absorbing characteristics can be improved. 19 elastic film 19 ₂ at the time of the _second molding
Burrs occurring on the outer periphery can be effectively used as a lip portion 35, it is deburring work after molding the elastic film 19 ₂ becomes unnecessary.

FIG. 8 shows a fourth embodiment of the present invention, in which parts corresponding to the above embodiments are denoted by the same reference numerals.

The vibration absorbing means 1 is closed by closing a through hole 17 provided in the outer wall 11b of the cylinder block 11.
6 ₄ is attached to the outer wall 11b of the cylinder block 11, the vibration absorbing means 16 _4, the through the closing member 18 ₂ closing the holes 17, water passage portion 14a of the one surface liquid passage 14
The elastic membrane 19 ₁ for exposing the other surface in the space 20 formed between the closure member 18 ₂ with to face to the closure member 1
Together it is attached to ₈₂ and a holding member 21 ₁ for holding the elastic membrane 19 ₁ between the closing member 18 _2.

The closing member 18 ₂ is internally threaded second through-hole 17
3, a projecting flange 25 projecting radially outward from the outer end of the male thread 24, and an engaging operation portion 26 projecting outward from the center of the projecting flange 25. When,
A cylindrical mounting portion 27 ₁ protrudes from the inner end of the male screw portion 24 coaxially to form a step-like regulating portion 28 between the male screw portion 24, and protrudes from the distal end inner circumferential edge of the mounting portion 27 ₁ and an annular engagement portion 36 which engages the inner periphery of the seal portion 29 of the elastic film 19 ₁ integrally formed of a metal material having rigidity.

[0048] According to the fourth embodiment, on which exhibit the same effects as in the first embodiment, the elastic film 19 ₁ of the sealing portion 2
9 is to be sandwiched between is accurately positioned in a plane mounting portion 27 ₁ and the holding member 21 ₁ perpendicular to the axis of the mounting portion 27 ₁ by the annular engagement portion 36, the sealing portion 2
9 can be more sufficiently secured and the vibration absorption characteristics can be improved.

FIG. 9 shows a fifth embodiment of the present invention, in which parts corresponding to the above embodiments are given the same reference numerals.

The vibration absorbing means 1 is closed so as to close a through hole 17 provided in the outer wall 11b of the cylinder block 11.
6 ₅ is attached to the outer wall 11b of the cylinder block 11. The vibration absorbing means 16 _5, as in the first embodiment, the closing member 18 ₁ for closing the through hole 17, one side between the closure member 18 ₁ causes face the waterway section 14a of the liquid passage 14 the elastic membrane 19 ₁ for exposing the other surface forming the space portion 20, fixedly with attached to closing member 18 ₁ and a holding member 21 ₁ for holding the elastic membrane 19 ₁ between the closing member 18 ₁ Although those having a cylindrical portion 31 of the holding member 21 ₁ is engaged caulking and engaged with the outer surface of the mounting portion 27 ₁ of the closing member 18 _1.

[0051] That is to plural locations as the circumferential direction one location or this embodiment of the cylindrical portion 31 after press fitting of the mounting portion 27 _1, pressure of inward by the punch (not shown) is made to act, the radius Cylindrical part 31
Protruding projections 37 ... are engaged so as to bite into the outer surface of the mounting portion 27 ₁ of the closing member 18 ₁ from.

According to the fifth embodiment, the mounting portion 27 ₁
It would loose retention member 21 ₁ pressed into can be prevented. That consists closing member ₁₈₁ is for example an aluminum alloy, when the holding member 21 ₁ is for example made of an iron-based residual amount of such JIS SP, due to the thermal expansion difference due to accompanying temperature change in the engine operation holding it is conceivable to member 21 ₁ will loose, by using a caulking structure as described above, the loosening of the retaining member 21 ₁ and reliably prevent the sealing portion 29 of the elastic film 19 ₁
Can be reliably maintained.

FIG. 10 shows a sixth embodiment of the present invention, in which parts corresponding to the above embodiments are given the same reference numerals.

The vibration absorbing means 1 is closed so as to close the through hole 17 provided in the outer wall 11b of the cylinder block 11.
6 ₆ is attached to the outer wall 11b of the cylinder block 11, the vibration absorbing means 16 _6, through the closing member 18 ₃ to close the hole 17, closing member causes facing the one side to the water passage portion 14a of the fluid path 14 18 ₃ and the elastic membrane 19 ₃ to face the other surface in the space 20 formed between the occlusion member 18
Together it is attached to ₃ and a holding member 21 ₁ for holding the elastic membrane 19 ₃ between the closing member 18 _3.

[0055] closing member 18 ₃ is internally threaded second through-hole 17
3, a projecting flange 25 projecting radially outward from the outer end of the male thread 24, and an engaging operation portion 26 projecting outward from the center of the projecting flange 25. When,
Is intended and a cylindrical mounting portion 27 ₂ projecting coaxially from the inner end of the male screw portion 24 to form a step-like regulating portion 28 between the male screw portion 24, an intermediate portion of the mounting portion 27 ₂ distally outer periphery from the small-diameter cylindrical portion 39 ₁ is formed through the annular step 38 facing the distal end side.

Meanwhile, the elastic film 19 _3, the attachment portion 27 ₂ of the front end surface or the small-diameter cylindrical portion 39 of the closure member 18 ₃
A thick ring-shaped seal portion 29 which contacts the _first distal end surface,
The seal portion 2 is formed to be thinner than the seal portion 29 and
The film portion 30 integrally connected to form a step on the inner periphery of 9 and has integrally a fitting cylindrical portion 40 ₁ which fits into the small-diameter cylindrical portion 39 ₁ continuous with the outer periphery of the sealing portion 29 .

[0057] According to the sixth embodiment, by fitting cylindrical portion 40 ₁ of the elastic film 19 _3, fitted to the front end portion of the mounting portion 27 ₂ in the closure member 18 _3, the holding of the elastic membrane 19 ₃ dropping from between members 21 ₁ and the closing member 18 ₃ is effectively prevented.

FIG. 11 shows a seventh embodiment of the present invention, in which parts corresponding to the above embodiments are given the same reference numerals.

The vibration absorbing means 1 is closed so as to close the through hole 17 provided in the outer wall 11b of the cylinder block 11.
6 ₇ is attached to the outer wall 11b of the cylinder block 11, the vibration absorbing unit 16 _7, the closing member 18 ₄ for closing the through-hole 17, the closing member causes facing the one side to the water passage portion 14a of the fluid path 14 18 the elastic membrane 19 ₄ for exposing the other surface in the space 20 formed between the _4, closure member 18 ₄
And a holding member 21 ₁ for holding the elastic membrane 19 ₄ between the closing member 18 ₄ together is attached to.

[0060] closing member 18 _4, internally threaded second through-hole 17
3, a projecting flange 25 projecting radially outward from the outer end of the male thread 24, and an engaging operation portion 26 projecting outward from the center of the projecting flange 25. When,
Is intended and a cylindrical mounting portion 27 ₃ which protrudes coaxially from the inner end of the male screw portion 24 to form a step-like regulating portion 28 between the male screw portion 24, an intermediate portion of the mounting portion 27 ₃ distally outer periphery from the small-diameter cylindrical portion 39 ₂ having a tapered outer surface whose diameter is formed through the annular step 38 facing the distal end side as toward the tip side.

[0061] On the other hand, the elastic membrane 19 _4, the attachment portion 27 ₃ of the front end surface or the small-diameter cylindrical portion 39 of the closure member 18 ₄
A thick ring-shaped seal portion 29 which contacts the _second distal end surface,
The seal portion 2 is formed to be thinner than the seal portion 29 and
The film portion 30 integrally connected to form a step on the inner periphery of 9, the fitting cylindrical portion 40 which inner surface in order to fit continuous to the outer periphery of the sealing portion 29 to the small-diameter cylindrical portion 39 ₂ is formed in a tapered shape
₂ and 1 integrally.

[0062] According to the seventh embodiment, similarly to the sixth embodiment, it is possible to effectively prevent the coming off from between the elastic membrane 19 ₄ of the holding member 21 ₁ and the closing member 18 _4, fitting the outer surface of the small-diameter cylindrical portion 39 _second cylindrical part 40 ₂
It is Ru can <br/> the inner surface in close contact with the to further improve the sealing property.

Although the embodiments of the present invention have been described in detail, the present invention is not limited to the above embodiments, and various design changes can be made without departing from the present invention described in the appended claims. It is possible to do.

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 a case where radiation is generated from a passage forming member which forms a liquid passage facing at least a part of a vibration generating portion. This can be widely implemented as a device for reducing the vibration noise generated.

[0065]

As described above, according to the first aspect of the present invention, the vibration force acting on the passage forming body from the vibration generating section via the liquid is effectively reduced by the bending of the elastic film, thereby forming the passage forming section. Vibration noise radiated from the body can be reduced, and increase in weight of the passage forming body due to attachment of the vibration absorbing means can be suppressed as small as possible. The elastic membrane is
A closing member for closing the through hole in the outer wall of the formed body, and the closing member
Holding part that is pressed into the outer periphery of the cylindrical mounting part that protrudes from the inner end
The elastic film can be reliably held between the closing member and the holding member by preventing the sealing performance from being lowered due to the liquid pressure in the liquid passage and the deterioration of the elastic film. Excellent sealing performance can be obtained as compared with a film in which the film is directly fixed to the closing member by baking or adhesion.

According to the second aspect of the present invention, a syringe
The cooling water acting on the outer wall of the engine
A piston that effectively reduces vibration and radiates from the engine
Slap noise can be reduced, and vibration absorbing
Minimizing the weight increase of the engine body due to the mounting of the step
It is possible to The elastic membrane extends through the outer wall of the engine body.
A blocking member that closes the through-hole and a protruding portion at the inner end of the blocking member
Holding between the holding member pressed into the outer periphery of the cylindrical mounting part
Of the cooling water channel and deterioration of the elastic film
Of the elastic membrane to prevent the
And the holding member can be securely held,
Compared to those directly attached to the closing member by attaching or bonding
And excellent sealing properties can be obtained. Further closing member
Is screwed into the through hole,
The attachment / detachment operation to the engine body is easy.

According to the second aspect of the present invention, the elastic film is closed.
As well as being able to securely hold to the closing member,
If the holding member is pressed in until the pressing of the holding member is regulated,
As a result, it is possible to improve the workability of
Characteristics can be sufficiently ensured .

According to the fourth aspect of the present invention, the sealing portion of the elastic film is accurately positioned and sandwiched between the mounting portion and the holding member, and the sealing performance is more sufficiently secured to improve the vibration absorbing characteristics. can do.

According to the fifth aspect of the present invention, the sealing portion of the elastic film is accurately positioned and sandwiched between the mounting portion and the holding member, and the sealing performance is more sufficiently secured to improve the vibration absorbing characteristics. In addition to the above, it is possible to effectively use the burrs formed on the outer periphery of the elastic film as the lip during the formation of the elastic film, and the deburring work after the formation of the elastic film is unnecessary.

According to the sixth aspect of the present invention, the sealing portion of the elastic film is accurately positioned and sandwiched between the mounting portion and the holding member, so that the sealing performance is more sufficiently secured and the vibration absorbing characteristics are improved. Can be improved.

According to the seventh aspect of the present invention, the elastic film is fitted.
The mating cylinder is located at the tip of the mounting
Because it is fitted, between the elastic membrane holding member and the closing member
Can be effectively prevented.

[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.

FIG. 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 diagram showing a vibration mode of an outer wall surface of a cylinder block along an arrangement direction of each cylinder portion.

FIG. 5 is a diagram showing a vibration acceleration characteristic with respect to a frequency in comparison with a conventional case.

FIG. 6 is a sectional view corresponding to FIG. 3 of a second embodiment.

FIG. 7 is a sectional view of a third embodiment corresponding to FIG.

FIG. 8 is a sectional view corresponding to FIG. 3 of a fourth embodiment.

FIG. 9 is a sectional view of a fifth embodiment corresponding to FIG.

FIG. 10 is a sectional view of a sixth embodiment corresponding to FIG. 3;

[11] Ru sectional view der corresponding to Figure 3 of the seventh embodiment.

[Explanation of symbols]

11 ... cylinder block 11b ... outer wall 12 ... piston _131-134 ... cooling as the cylinder portion 14 ... liquid passage as a vibration generating unit waterways 14a ... water channel 16 ₁ to 16 ₇ ... vibration absorbing means 17 ... through hole 18 _{1-18 4:} closing member 19 _{1-19 4} ... elastic membrane 20 ... space 21 _1, 21 ₂ ... holding Member 27 ₁ ... Mounting part 28 ... Regulating part 29 ... Seal part 30 ... Membrane part 31 ... Cylinder part 34 ... Positioning part 35 ... Lip part 36 ... Circular engagement Joint E: Engine body as passage forming body

Continued on the front page (72) Inventor Motoyuki Sunaoka 1-4-1, Chuo, Wako-shi, Saitama Pref. Inside of Honda R & D Co., Ltd. (72) Inventor Masao Sakashita 1-4-1, Chuo, Wako-shi, Saitama Pref. Inside the Technical Research Institute (72) Noriaki Kawai 1-4-1 Chuo, Wako-shi, Saitama Honda Technical Research Institute, Inc. (56) References JP-A-6-185534 (JP, A) JP, U) JP-A-2-83496 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F02F 1/00-7/00 F16F 5/00 F16F 7/00 F16F 15 / 08

Claims (7)

(57) [Claims] [Claim 1] A vibration generating unit _(131-134) of at least a portion of the face was liquid passage (14) forming a passage defining member (E), the vibration generating unit _(131-134) the vibration absorbing means (16 ₁ to 16 ₇₎ is vibration noise reduction device provided to absorb vibrations transmitted through the liquid in the liquid passage (14) in the, allowed opening inner end to said liquid passageway (14) Through hole (1
7) is provided on the outer wall portion (11b) of said passage defining member (E), attachment portion to the inner end cylindrical with attached to the outer wall (11b) closes the through hole (17) (27 ₁ ~ 2
7 ₃₎ is the closing member which project (18 _{1-18 4),} the formed space between the closure member causes facing the one side to the liquid passage (14) (18 _{1-18 4)} (20 ) to an elastic layer for exposing the other surface (19 ₁ to 19 _4), wherein the mounting portion of the closing member (18 _{1-18 4)} (27 ₁ to 27
₃₎ press-fitted into the outer periphery the closure member (18 _{1-18 4)} and said elastic membrane (19 ₁ to 19 ₄₎ holding member (21 ₁ for holding, 21 ₂₎ the de vibration absorbing means between the (16 _1-16
7 ) A vibration sound reduction device characterized by comprising the following. To 2. A engine body including a piston cylinder unit for slidably fitting the (12) _(131-134) the cylinder is provided a block (11) (E), said cylinder unit (13 ₁ - 13 ₄₎ together with the cooling water passage including waterways portion (14a) which surrounds (14) is formed and is transmitted through the cooling water of the cooling water passage (14) in the said cylinder unit _(131-134) in vibration sound reducing device of the vibration absorbing means (16 ₁ to 16 ₇₎ is provided a water-cooled internal combustion engine for absorbing vibrations, through hole allowed opening inner end to said cooling water passage (14) (1
7) is provided on an outer wall portion (11b) of the engine body (E), is screwed into the through hole (17) while closing an outer end side of the through hole (17), and has a cylindrical mounting portion at the inner end. (27 _1-2
7 ₃₎ is the closing member which project (18 _{1-18 4),} the formed space between the closure member causes facing the one side to the cooling water passage (14) (18 _{1-18 5)} (20 ) to an elastic membrane (19 ₁ to 19 ₅₎ for exposing the other surface, wherein the mounting portion of the closing member (18 _{1-18 4)} (27 ₁ to 27
₃₎ press-fitted into the outer periphery the closure member (18 _{1-18 4)} and said elastic membrane (19 ₁ to 19 ₄₎ holding member (21 ₁ for holding, 21 ₂₎ the de said vibration absorbing means between the ( 16 ₁ ~
16 _7), characterized in that is constituted, vibration sound reducing device of the water-cooled internal combustion engine. 3. The holding member (21 ₁ , 21 ₂ )
Said closure member an outer peripheral portion of the serial elastic membrane (19 ₁ to 19 ₄₎
(18 _{1-18 4)} and sandwiched therebetween said closure member between (18 ₁
Pressure to the mounting portion (27 ₁ to 27 ₃₎ the outer periphery of to 18 ₄₎
It is input, the the closing member (18 _{1-18 4),} the coercive
Closure member support member (21 _1, 21 ₂₎ (18 ₁ to 1
8 ₄ ) Restricting part that regulates the moving end in the press-fitting direction
3. The method according to claim 1, wherein (28) is provided.
The vibration sound reducing device according to the above. Wherein said elastic membrane (19 _1), the endless sealing portion in contact with the front end surface of the mounting portion (27 ₁₎ (2
9) and a membrane portion (30) formed thinner than the seal portion (29) and formed integrally with the inner periphery of the seal portion (29) with a step formed therein. The closing member (18) is sandwiched between the tip of the mounting portion (27 ₁ ).
The elastic film (19 ₁ ) is positioned on a plane perpendicular to the axis of the mounting portion (27 ₁ ) by engaging the holding member (21 ₂ ) mounted on ₁ ) with the inner periphery of the seal portion (29). 4. The vibration sound reducing device according to claim 1 , further comprising a positioning portion (34) that fulfills the following. Wherein said elastic membrane (19 _2), said mounting portion (27 ₁₎ endless sealing portion in contact with the front end surface of the (2
9) and an annular lip portion (35) projecting outward from the outer periphery of the seal portion (29).
The holding member (21 ₁ ) attached to the closing member (18 ₁ ) with the 9) sandwiched between the tip of the attachment portion (27 ₁ ) and the holding member (21 ₁ ) comes into contact with the outer periphery of the lip (35). Elastic membrane (1) on a plane perpendicular to the axis of the section (27 ₁ )
The vibration sound reduction device according to claim 1 , 2 or 3, further comprising a cylindrical portion (31) for performing the positioning of (9 ₂ ). 6. The elastic member ( ₁ ) in a plane perpendicular to an axis of the through hole (17) is provided on the closing member (182).
4. The vibration sound reducing device according to claim 1 , wherein an annular engaging portion (36) is provided for engaging the elastic film (19 ₁ ) over the entire circumference so as to perform the positioning of the item (9 ₁ ). . 7. The elastic membrane (19) _Three , 19 _Four ) Mating circle
Tube (40 ₁ , 40 _Two ) Is the closing member (18) _Three , 1
8 _Four ) In the mounting portion (27) _Two , 27 _Three ) Tip
4. A fitting part, wherein
The vibration sound reducing device according to the above.