JP2018112231A - Fluid sealed type vibration isolator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fluid sealed type vibration isolator having a new structure being capable of simply fixing an orifice member and a cover plate member.SOLUTION: In a fluid sealed type vibration isolator 10 comprising an orifice member 40 which forms an orifice passage 84 disposed between fluid chambers 80 and 82, in which at the oscillatory input time, relative pressure fluctuations are produced, so as to communicate the fluid chamber 80 with the fluid chamber 82, a cover plate member 42 is overlapped on the orifice member 40; by press fitting a force fit pin 56 projected from the overlap mating surface of the cover plate member 42 in the orifice member 40 into a press-in hole 64 penetrated the cover plate member 42, the cover plate member 42 is fixed in a state in which the cover plate member is overlapped on the orifice member 40; at the tip of the force fit pin 56, a tip inclined face 58 is provided which becomes a smaller diameter toward on the tip side; and at the opening part on the base end side in which the force fit pin 56 in the press-in hole 64 of the cover plate member 42 is inserted, an opening inclined plane 66 is provided which becomes a larger diameter toward on the opening side.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a vibration isolator used for an engine mount of an automobile, and more particularly to a fluid filled type vibration isolator utilizing a vibration isolating effect based on a fluid action of a fluid sealed inside.

  2. Description of the Related Art Conventionally, a fluid-filled vibration isolator having a fluid chamber in which an incompressible fluid is sealed has been proposed as a type of vibration isolator used as an engine mount of an automobile. The fluid-filled vibration isolator is, for example, a rubber-like elastic body in which the first mounting tool and the second mounting tool are like a liquid-filled vibration damping device described in Japanese Patent Laid-Open No. 2009-281431 (Patent Document 1). And have a structure elastically connected to each other. In addition, a first liquid chamber and a second liquid chamber in which liquid is sealed are provided, and an orifice is provided for communicating the first liquid chamber and the second liquid chamber. The anti-vibration effect is exhibited by the flow.

  By the way, the liquid-filled vibration isolator of Patent Document 1 includes partition means for partitioning the first liquid chamber and the second liquid chamber and forming an orifice. The partition means has a structure in which the second clamping member is overlapped on the upper surface of the cylindrical member, and the protruding portion protruding from the cylindrical member is inserted through the second clamping member having a larger diameter than the protruding portion. After the insertion through the hole, the projecting portion is compressed in the axial direction to be expanded in diameter, and the outer peripheral surface of the projecting portion is brought into pressure contact with the inner peripheral surface of the insertion hole, whereby the cylindrical member and the second clamping member It is formed by combining.

  However, in the structure in which the cylindrical member and the second holding member as in Patent Document 1 are fixed by expanding the diameter of the projecting portion inserted through the insertion hole, the cylindrical member and the second holding member are arranged at the time of manufacturing the partition means. In addition to superimposing, a process of axially compressing the protruding portion is required, which increases the number of processes and takes time and effort.

JP 2009-281431 A

  The present invention has been made in the background of the above-mentioned circumstances, and the problem to be solved is a fluid-filled vibration isolator having a novel structure that can more easily fix the orifice member and the cover plate member. It is to provide.

  Hereinafter, the aspect of this invention made | formed in order to solve such a subject is described. In addition, the component employ | adopted in each aspect as described below is employable by arbitrary combinations as much as possible.

  That is, the first aspect of the present invention is a fluid enclosure comprising an orifice member that is disposed between fluid chambers in which relative pressure fluctuations are generated at the time of vibration input and forms an orifice passage communicating between the fluid chambers. In the vibration isolator, a cover plate member is overlaid on the orifice member, and a press-fit pin protruding from the overlap surface of the cover plate member in the orifice member is inserted into a press-fit hole penetrating the cover plate member. By press-fitting, the cover plate member is fixed in a state of being superimposed on the orifice member, and a tip inclined surface having a small diameter toward the tip side is provided at the tip of the press-fitting pin. In addition, an opening inclined surface having a large diameter toward the opening side is provided in the opening portion on the base end side where the press-fitting pin is inserted into the press-fitting hole of the lid plate member.

  According to the fluid-filled vibration isolator having the structure according to the first aspect, the orifice member and the cover plate member are fixed by the press-fitting pin of the orifice member being pressed into the press-fitting hole of the cover plate member. Therefore, a process such as crushing the tip of the press-fit pin is not necessary, and the orifice member and the cover plate member can be easily fixed.

  Moreover, since the tip inclined surface is provided at the distal end portion of the press-fit pin, and the opening inclined surface is provided at the proximal end side opening portion of the press-fit hole, when the press-fit pin is pressed into the press-fit hole, By the contact between the tip inclined surface and the opening inclined surface, the press-fitting pin is guided to an appropriate relative position in the direction perpendicular to the press-fitting direction with respect to the press-fitting hole. Thereby, the press-fitting work of the press-fitting pin into the press-fitting hole is also simplified, and the orifice member and the cover plate member can be fixed more easily.

  Furthermore, since the edge of the tip of the press-fit pin is chamfered by the tip inclined surface, and the edge of the proximal end opening of the press-fit hole is chamfered by the opening inclined surface, when press-fitting the press-fit pin into the press-fit hole, The tip edge of the press-fitting pin and the edge of the base-end opening of the press-fitting hole are prevented from being cut, and shavings are less likely to occur. As a result, even if the press-fitting allowance between the press-fit pin and the press-fit hole is large, it is possible to prevent the swarf from entering between the outer peripheral surface of the press-fit pin and the inner peripheral surface of the press-fit hole, thereby reducing the strength of the press-fit pin. Therefore, the fixing strength of the orifice member and the cover plate member can be stably increased.

  According to a second aspect of the present invention, in the fluid-filled vibration isolator described in the first aspect, the opening inclined surface of the lid plate member and a base end portion of the press-fitting pin press-fitted into the press-fitting hole, Between these, a waste reservoir is provided.

  According to the second aspect, even if swarf is generated by press-fitting the press-fit pin into the press-fit hole, the swarf is accommodated in the debris accumulation part, so that the drag force against the press-fit pin from the press-fit hole ( It is possible to prevent the drop strength) from being reduced by shavings. In particular, by providing the waste pool portion at the opening portion of the press-fit base end side of the press-fit pin in the press-fitting hole of the cover plate member, the shavings that are likely to occur in the initial press-fitting are quickly accommodated in the waste pool portion, and the shavings are It is difficult to enter between the press-fit surface of the press-fit pin and the press-fit hole.

  According to a third aspect of the present invention, in the fluid-filled vibration isolator described in the first or second aspect, the orifice member is provided with a movable member on which fluid pressure is applied, and the orifice member An opening recess provided at one central portion of the fluid chamber that opens to the fluid chamber side is covered with the lid plate member superimposed on the orifice member, thereby forming an accommodation region for the movable member. The orifice member and the cover plate member are fixed in a state where they are overlapped with each other by press-fitting the press-fit pin provided on the outer peripheral side of the accommodation region into the press-fit hole.

  According to the third aspect, the press-fitting pin provided around the opening recess in the orifice member is press-fitted into the press-fitting hole of the lid plate member, so that the orifice member and the lid plate member accommodate the movable member. Fixed around each other. Therefore, it is difficult for a gap to be generated between the overlapping surfaces of the orifice member and the cover plate member around the accommodation area, and the accommodation area can be prevented from being short-circuited to the fluid chamber.

  According to a fourth aspect of the present invention, in the fluid-filled vibration isolator described in any one of the first to third aspects, the press-fitting pin passes through the press-fitting hole of the lid plate member and the press-fitting is performed. The tip of the pin protrudes from the press-fitting hole, and the tip inclined surface of the press-fit pin is formed at the tip of the press-fit pin protruding from the press-fitting hole.

  According to the fourth aspect, the portion of the orifice member that is out of the inclined surface of the press-fitting pin is press-fitted into the press-fitting hole of the cover plate member. It can be obtained, and it becomes easy to set the fixing strength of the orifice member and the cover plate member large.

  According to a fifth aspect of the present invention, in the fluid-filled vibration isolator described in any one of the first to fourth aspects, the orifice member is provided with a plurality of the press-fit pins, and the lid The plate member is provided with a plurality of the press-fitting holes corresponding to the press-fitting pins.

  According to the fifth aspect, the plurality of press-fitting pins are press-fitted into each of the plurality of press-fitting holes, so that the fixing strength of the orifice member and the cover plate member can be easily set large. In addition, since the orifice member and the cover plate member are fixed to each other at a plurality of locations, the entire orifice member and the cover plate member can be easily held in an appropriate connection state.

  According to a sixth aspect of the present invention, in the fluid-filled vibration isolator described in any one of the first to fifth aspects, a pin main body in which the press-fit pin protrudes from the orifice member and the pin main body A plurality of press-fitting ribs projecting from the outer peripheral surface of the pin main body and extending in the protruding direction of the pin main body, and the outer shape of the pin main body is made smaller than the internal dimension of the press-fitting hole, and the press-fitting pin The portion where the press-fitting rib is formed is press-fitted and fixed in the press-fitting hole.

  According to the 6th aspect, the press input required when press-fitting a press-fit pin into a press-fit hole can be made comparatively small. Moreover, it is not necessary to reduce the diameter of the press-fit pin in order to reduce the press input, and it is possible to reduce the press input while setting the deformation rigidity of the press-fit pin sufficiently large.

  According to a seventh aspect of the present invention, in the fluid-filled vibration isolator described in any one of the first to sixth aspects, it is necessary to remove the press-fit pin from the press-fit hole of the lid plate member. The load is 0.5 kN or more.

  According to the seventh aspect, the orifice member and the cover plate member can be fixed with a practically sufficient strength by setting the pull-out strength of the press-fit pin to 0.5 kN or more. Moreover, even if a press-fitting allowance capable of realizing a large pull-out strength of 0.5 kN or more is set, it is possible to prevent the generation of shavings when the press-fitting pin is inserted into the press-fitting hole by the tip inclined surface and the opening inclined surface. The member and the cover plate member can be stably in a predetermined assembled state.

  According to the present invention, since the orifice member and the cover plate member are fixed by press-fitting the press-fit pin into the press-fitting hole, the orifice member and the cover plate member can be easily fixed. Moreover, a tip inclined surface is provided at the distal end portion of the press-fit pin, and an opening inclined surface is provided at an opening portion on the proximal end side of the press-fit hole, and the press-fit pin is brought into contact with the tip inclined surface and the open inclined surface. Therefore, the press-fitting operation of the press-fit pin into the press-fit hole is also simplified. Furthermore, the tip inclined surface of the press-fit pin and the opening inclined surface of the press-fit hole prevent the edge of the tip of the press-fit pin and the edge of the press-fit hole from being opened at the time of press-fitting and generate shavings. Because it is difficult, even if the press-fitting pin and the press-fitting hole have a large press-fitting allowance, the swarf enters between the outer peripheral surface of the press-fitting pin and the inner peripheral surface of the press-fitting hole, and the press-out strength of the press-fitting pin decreases. Can be prevented.

Sectional drawing which shows the engine mount as 1st embodiment of this invention. It is sectional drawing of the partition member which comprises the engine mount shown in FIG. 1, Comprising: The figure corresponded in the II-II cross section of FIG. The top view of the partition member shown in FIG. Sectional drawing of the orifice member which comprises the partition member shown in FIG. Sectional drawing of the principal part which expands and shows A of FIG. Sectional drawing of the cover board member which comprises the partition member shown in FIG. Sectional drawing of the principal part which expands and shows B of FIG. Sectional drawing of the principal part which expands and shows C of FIG. Sectional drawing which shows the engine mount as 2nd embodiment of this invention. The perspective view of the partition member which comprises the engine mount shown in FIG. The top view of the partition member shown in FIG. The top view of the principal part which expands and shows D of FIG. It is sectional drawing which expands and shows the principal part of the partition member which comprises the engine mount shown in FIG. 9, Comprising: The figure corresponded in the XIII-XIII cross section of FIG.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 shows an engine mount 10 for an automobile as a first embodiment of a fluid filled type vibration damping device having a structure according to the present invention. The engine mount 10 has a structure in which a first mounting member 12 and a second mounting member 14 are elastically connected by a main rubber elastic body 16. In the following description, the vertical direction means the vertical direction in FIG. 1 in principle.

  More specifically, the first mounting member 12 is a highly rigid member formed of iron, aluminum alloy, fiber reinforced resin, or the like, and has a substantially cylindrical shape as a whole and opens on the upper surface. A screw hole 18 is provided. Furthermore, a flange portion 20 that protrudes to the outer periphery is integrally formed at the upper end portion of the first mounting member 12.

  The second mounting member 14 is a highly rigid member made of iron, aluminum alloy, fiber reinforced resin, or the like, and has a thin cylindrical shape with a large diameter. The first mounting member 12 and the second mounting member 14 are arranged on the same central axis, and the first mounting member 12 and the second mounting member 14 are elastically connected by the main rubber elastic body 16. Yes.

  The main rubber elastic body 16 has a substantially frustoconical shape, the upper end portion having a small diameter is vulcanized and bonded to the first mounting member 12, and the outer peripheral surface of the lower end portion having a large diameter is the first. The second mounting member 14 is vulcanized and bonded. Further, the main rubber elastic body 16 is formed with a large-diameter recess 22 in the shape of a reverse mortar that opens in the lower surface.

  A flexible membrane 24 is attached to the integrally vulcanized molded product of the main rubber elastic body 16 including the first attachment member 12 and the second attachment member 14. The flexible film 24 is a thin rubber film that is easily allowed to bend and deform in the thickness direction, and has a generally disc shape as a whole.

  Further, a connecting member 26 is fixed to the outer peripheral end portion of the flexible film 24. The connecting member 26 has a substantially stepped cylindrical shape including a small-diameter cylindrical portion 30 below the large-diameter cylindrical portion 28, and the lower end portion of the small-diameter cylindrical portion 30 protrudes toward the inner peripheral side so that it is flexible. Vulcanized and bonded to the outer peripheral end of the membrane 24. A thin cylindrical first seal rubber 32 integrally formed with the flexible membrane 24 is fixed to the small diameter cylindrical portion 30 of the connecting member 26 so as to cover substantially the entire inner peripheral surface. Further, a second seal rubber 34 separate from the flexible film 24 is fixed to the inner peripheral surface of the large-diameter cylindrical portion 28 of the connecting member 26.

  Then, the large-diameter cylindrical portion 28 of the connecting member 26 fixed to the flexible film 24 is extrapolated with respect to the second mounting member 14, and the second mounting member 14 is subjected to diameter reduction processing such as eight-way drawing. As a result, the flexible film 24 is arranged to face the lower side of the main rubber elastic body 16. In the state where the flexible membrane 24 is attached to the integrally vulcanized molded product of the main rubber elastic body 16, a fluid sealing region 36 separated from the outside is defined between the main rubber elastic body 16 and the flexible membrane 24. The incompressible fluid is sealed in the fluid sealing region 36. The incompressible fluid sealed in the fluid sealing region 36 is not particularly limited, and examples thereof include water, liquids such as ethylene glycol, alkylene glycol, polyalkylene glycol, and silicone oil, and mixtures thereof. Can be suitably employed. Furthermore, in order to advantageously obtain a vibration isolation effect based on the fluid flow action, a low-viscosity fluid of 0.1 Pa · s or less is desirable.

  A partition member 38 is disposed in the fluid sealing area 36. The partition member 38 is a hard member formed of metal, resin, or the like, and has a structure in which a cover plate member 42 is superimposed on the upper surface of the orifice member 40 as shown in FIGS.

  The orifice member 40 has a substantially disk shape as a whole, and as shown in FIG. 4, an upper wall portion 44 that opens to the upper surface at the inner peripheral portion and a lower wall portion that opens to the lower surface at the radially intermediate portion. By forming the portion 46, the inner peripheral portion is thinner in the vertical direction than the outer peripheral end portion. In addition, an orifice groove 48 is formed at the outer peripheral end of the orifice member 40 while extending in the circumferential direction with a length of at least one round and less than two rounds while opening on the outer circumferential surface, and one end in the length direction is the inner end. It opens to the circumferential side and communicates with the region above the orifice member 40, and the other end in the longitudinal direction opens to the inner circumferential side and communicates with the region below the orifice member 40. .

  Further, an opening recess 50 is formed on the inner peripheral side of the lower wall portion 46 of the orifice member 40. The opening recess 50 is a recess that has a substantially circular cross section and extends up and down and opens on the upper surface, and a short-circuit hole 52 penetrating vertically is formed in the bottom wall portion. In the present embodiment, positioning protrusions 54 projecting toward the inner periphery are formed at three locations in the circumferential direction at the lower portion of the inner peripheral wall surface of the opening recess 50.

Further, the orifice member 40 is integrally formed with a press-fit pin 56 protruding upward. The press-fit pins 56 have a substantially cylindrical shape with a small diameter, and are projected from the upper surface of the orifice member 40 as shown in FIGS. 4 and 5, and three are arranged substantially evenly in the circumferential direction (see FIG. 3). ). In the present embodiment, the press-fit pin 56 is provided on the outer peripheral side of the opening recess 50 in the orifice member 40. Further, as shown in FIG. 5, the protruding tip portion of the press-fit pin 56 is a tip inclined surface 58 whose outer peripheral surface has a smaller diameter toward the tip side, and the tip portion has a smaller diameter than the base end portion. Yes. Since the tip inclined surface 58 is formed, the angles α ₁ and α ₂ of the corners of the press-fit pins 56 formed at both ends of the tip inclined surface 58 are both larger than 90 °. .

  A cover plate member 42 is superimposed on the upper surface of the orifice member 40 having such a structure. As shown in FIG. 6, the cover plate member 42 has a thin and substantially circular disk shape, and has an inner peripheral portion because the radial intermediate portion is inclined downward toward the inner periphery. Is located below the outer peripheral portion. In addition, four through holes 60, 60, 60, 60 penetrating vertically are formed in the radial intermediate portion of the cover plate member 42 including the inclined portion, and are arranged substantially evenly in the circumferential direction (see FIG. 3). Further, a communication hole 62 penetrating vertically is formed in the inner peripheral portion of the cover plate member 42.

Further, as shown in FIGS. 6 and 7, a press-fitting hole 64 penetrating vertically is formed in the outer peripheral portion of the lid plate member 42. The press-fit holes 64 have a substantially circular cross section with a small diameter and penetrate the lid plate member 42 in the thickness direction, and are formed at three locations in the circumferential direction of the lid plate member 42 as shown in FIG. As shown in FIGS. 6 and 7, the lower opening portion, which is the proximal end opening portion into which the press-fit pin 56 is press-fitted in the press-fit hole 64, has a large diameter toward the lower side whose inner peripheral surface is the open side. The opening inclined surface 66 has a tapered shape. In addition, the inner diameter of the press-fitting hole 64 is larger than the diameter of the distal end portion of the press-fit pin 56 of the orifice member 40 and smaller than the diameter of the proximal end portion of the press-fit pin 56. Yes. Further, the press-fitting hole 64 has a larger diameter than the base end portion of the press-fitting pin 56 at the portion where the opening inclined surface 66 is formed. Since the opening inclined surface 66 is formed, the angles β ₁ and β _{2 of the} corners formed at both ends of the opening inclined surface 66 are both larger than 90 °.

  Then, the lid plate member 42 is superimposed on the orifice member 40 from above, and the press-fitting pin 56 of the orifice member 40 is press-fitted into the press-fitting hole 64 of the lid plate member 42, whereby the orifice member 40 and the lid plate member 42 are overlapped. They are fixed to each other in the combined state. The three press-fit pins 56, 56, 56 of the orifice member 40 and the three press-fit holes 64, 64, 64 of the lid plate member 42 are formed at positions corresponding to each other, and the three press-fit pins 56, 56 are formed. , 56 are press-fitted into each of the three press-fitting holes 64, 64, 64.

  In the state where the press-fit pin 56 shown in FIG. 8 is press-fitted and fixed in the press-fit hole 64, the press-fit pin 56 penetrates the press-fit hole 64, and the tip of the press-fit pin 56 is above the upper opening of the press-fit hole 64. Protrudes up to. The entire tip inclined surface 58 formed at the tip of the press-fit pin 56 is located above the upper opening of the press-fit hole 64, and the upper surface of the cover plate member 42 is below the tip inclined surface 58. Is located. As described above, since the lid plate member 42 is press-fitted and fixed to the press-fit pin 56 on the base end side with respect to the distal inclined surface 58, the press-fit area of the press-fit pin 56 with respect to the press-fit hole 64 can be efficiently increased. This makes it easy to set the fixing strength of the orifice member 40 and the cover plate member 42 large.

  Furthermore, the load (removal strength) necessary for extracting the press-fit pin 56 press-fitted into the press-fit hole 64 from the press-fit hole 64 is preferably set to 0.5 kN or more, more preferably 1 kN or more. Thereby, the orifice member 40 and the cover plate member 42 can be fixed with practically sufficient strength. On the other hand, the load necessary to remove the press-fit pin 56 press-fitted into the press-fit hole 64 from the press-fit hole 64 is preferably set to 5 kN or less. Can be prevented, and deformation of the press-fit pin 56 and deformation of the cover plate member 42 around the press-fit hole 64 are avoided.

  Here, a tip inclined surface 58 is provided at the projecting tip of the press-fit pin 56 and an opening inclined surface 66 is provided at the lower opening of the press-fit hole 64, so that the press-fit hole 64 of the press-fit pin 56 is provided. At the time of press-fitting, the tip end corner portion of the press-fit pin 56 is located away from the inner peripheral surface of the press-fit hole 64 toward the inner peripheral side, so that it is difficult to make contact with the lower peripheral edge or inner peripheral surface of the press-fit hole 64. At the same time, the peripheral edge of the lower opening of the press-fitting hole 64 is located away from the outer peripheral side of the press-fit pin 56 and is difficult to contact the press-fit pin 56.

  Further, in a state where the press-fit pin 56 is press-fitted and fixed in the press-fit hole 64, the base end portion of the press-fit pin 56 is located away from the inner peripheral side with respect to the opening inclined surface 66 of the press-fit hole 64 as shown in FIG. In addition, a waste accumulation portion 68 is formed between the outer peripheral surface of the proximal end portion of the press-fit pin 56 and the opening inclined surface 66 of the press-fit hole 64. The waste accumulation portion 68 is an annular space formed on the inner peripheral side of the opening inclined surface 66, and extends around the base end portion of the press-fit pin 56 over the entire circumference.

  In addition, as shown in FIGS. 1 and 2, the orifice member 40 and the cover plate member 42 are overlapped and fixed vertically so that the upper opening of the opening recess 50 of the orifice member 40 becomes the inner periphery of the cover plate member 42. Covered with a portion, an accommodation region 70 is formed between the orifice member 40 and the cover plate member 42. In this embodiment, the press-fit pin 56 is provided on the outer peripheral side of the opening recess 50 in the orifice member 40, and the orifice member 40 and the cover plate member 42 are fixed to each other around the opening recess 50. Thus, an accommodation area 70 is formed. Therefore, it is difficult for a gap to be generated between the overlapping surfaces of the peripheral wall portion of the opening recess 50 and the cover plate member 42 in the orifice member 40, and a short circuit between the accommodation region 70 and the pressure receiving chamber 80 described later is prevented.

  In this accommodation area 70, a rubber valve 72 as a movable member is accommodated. The rubber valve 72 is integrally provided with, for example, a substantially disc-shaped valve body 74 and a contact portion 76 that protrudes upward from the radial center portion of the valve body 74, and the valve body 74 is short-circuited. The short-circuit hole 52 is closed by being superimposed on the lower wall portion of the accommodation region 70 in which the hole 52 is formed. Further, the rubber valve 72 is urged downward by a coil spring 78 as urging means disposed between the valve main body 74 and the upper wall portion of the accommodation area 70, so that the valve main body 74 is accommodated. It is pressed against the lower wall portion of the region 70. The three positioning protrusions 54, 54, 54 projecting from the inner surface of the peripheral wall of the storage area 70 come into contact with the valve main body 74 of the rubber valve 72, so that the rubber valve 72 is radially in the storage area 70. It is positioned.

  As described above, the orifice member 40 and the cover plate member 42 are fixed to each other by press-fitting the press-fit pin 56 into the press-fit hole 64, and the storage region 70 formed between the orifice member 40 and the cover plate member 42 has a rubber. By accommodating the valve 72, the partition member 38 of the present embodiment is formed.

  As shown in FIG. 1, the partition member 38 is accommodated and disposed in a fluid sealing region 36 formed between the main rubber elastic body 16 and the flexible film 24. That is, the partition member 38 is disposed so as to extend in the direction perpendicular to the axis within the fluid sealing region 36, and is supported by the small-diameter cylindrical portion 30 of the connecting member 26 whose outer peripheral surface is fixed to the flexible film 24. Yes. The outer peripheral surface of the partition member 38 is overlapped with the inner peripheral surface of the small diameter cylindrical portion 30 via the first seal rubber 32, and the space between the partition member 38 and the small diameter cylindrical portion 30 is sealed in a fluid-tight manner. ing.

  With such an arrangement of the partition member 38, the fluid sealing region 36 is divided into two parts above and below the partition member 38. That is, on the upper side of the partition member 38, a pressure receiving chamber 80 is formed as one fluid chamber in which a part of the wall portion is constituted by the main rubber elastic body 16 and an internal pressure fluctuation is caused at the time of vibration input. On the lower side of the partition member 38, an equilibrium chamber 82 is formed as the other fluid chamber in which a part of the wall portion is formed of the flexible film 24 and volume change is allowed. In other words, the partition member 38 is disposed between the pressure receiving chamber 80 and the equilibrium chamber 82, and the pressure receiving chamber 80 and the equilibrium chamber 82 are partitioned by the partition member 38. An incompressible fluid is sealed in the pressure receiving chamber 80 and the equilibrium chamber 82 that constitute the fluid sealing region 36.

  Further, the orifice opening of the orifice groove 48 formed at the outer circumference end portion of the orifice member 40 is covered fluid-tightly by the small diameter cylindrical portion 30 of the connecting member 26, so that the orifice groove 48 becomes a tunnel-shaped passage. In addition, one end portion communicates with the pressure receiving chamber 80 and the other end portion communicates with the equilibrium chamber 82. Thereby, an orifice passage 84 that communicates the pressure receiving chamber 80 and the equilibrium chamber 82 with each other is formed by the orifice groove 48. The orifice passage 84 of the present embodiment adjusts the ratio A / L of the passage cross-sectional area A and the passage length L so that the tuning frequency that is the resonance frequency of the fluid flowing through the orifice passage 84 is a low frequency of about 10 Hz. It has been tuned to.

  The engine mount 10 is attached to a vehicle by attaching the first attachment member 12 to a power unit (not shown) and the second attachment member 14 to a vehicle body (not shown), so that the power unit and the vehicle body are attached. Anti-vibration connection is provided. When axial vibration is input between the power unit and the vehicle body in such a state that the engine mount 10 is mounted on the vehicle as described above, the internal pressure fluctuation is caused in the pressure receiving chamber 80 due to the elastic deformation of the main rubber elastic body 16. Thus, fluid flow based on the relative pressure difference between the pressure receiving chamber 80 and the equilibrium chamber 82 occurs in the orifice passage 84. As a result, based on a fluid action such as a resonance action of the fluid, a target vibration isolation effect (vibration damping effect) is exhibited.

  Furthermore, since the fluid pressure of the pressure receiving chamber 80 is exerted on the upper surface of the rubber valve 72 and the fluid pressure of the equilibrium chamber 82 is exerted on the lower surface of the rubber valve 72, the internal pressure of the pressure receiving chamber 80 is greatly reduced. Then, the rubber valve 72 moves to the pressure receiving chamber 80 side against the urging force of the coil spring 78. Thereby, the closing of the short-circuit hole 52 by the rubber valve 72 is released, and the short-circuit hole 52 is switched to the communication state, so that the pressure receiving chamber 80 and the equilibrium chamber 82 are connected through the short-circuit hole 52, the accommodation region 70, and the communication hole 62. By communicating with each other, the negative pressure in the pressure receiving chamber 80 is quickly reduced or eliminated. As a result, generation of cavitation bubbles due to a significant decrease in internal pressure of the pressure receiving chamber 80 can be prevented, and abnormal noise generated when the cavitation bubbles disappear can be reduced or avoided.

  In the engine mount 10 having the structure according to this embodiment, the press-fitting pin 56 of the orifice member 40 is press-fitted into the press-fitting hole 64 of the cover plate member 42, so that the orifice member 40 and the cover plate member 42 are fixed to each other. Thus, a partition member 38 is formed. Therefore, when the partition member 38 is formed, a process such as crushing the tip of the press-fit pin 56 inserted into the press-fit hole 64 is unnecessary, and the partition member 38 can be formed more easily.

  In the present embodiment, since the plurality of press-fit pins 56 provided in the orifice member 40 are press-fitted and fixed in each of the plurality of press-fit holes 64 of the cover plate member 42, the orifice member 40 and the cover plate member 42. It is easy to set the fixed strength of. In addition, since the orifice member 40 and the cover plate member 42 are fixed to each other at a plurality of locations, the whole orifice member 40 and the cover plate member 42 are easily held at appropriate relative positions.

  Further, since the distal end inclined surface 58 is provided at the distal end portion of the press-fit pin 56 and the opening inclined surface 66 is provided at the proximal end side opening portion of the press-fit hole 64, the press-fit hole 64 of the press-fit pin 56. When the tip inclined surface 58 and the opening inclined surface 66 come into contact with each other during press-fitting, the press-fitting pin 56 is guided to an appropriate relative position in the direction perpendicular to the press-fitting direction with respect to the press-fitting hole 64 as the press-fitting proceeds. Thereby, the press-fitting work of the press-fit pin 56 into the press-fitting hole 64 is facilitated, and the orifice member 40 and the cover plate member 42 can be more easily fixed.

  Further, the tip inclined surface 58 is formed at the tip end portion of the press-fit pin 56, so that the edge of the tip end of the press-fit pin 56 is chamfered, and the opening inclined surface 66 is formed at the proximal end side opening portion of the press-fit hole 64. By being formed, the edge of the base end side opening of the press-fitting hole 64 is chamfered. Therefore, at the time of press-fitting the press-fit pin 56 into the press-fit hole 64, the edge of the front end of the press-fit pin 56 and the edge of the base end side opening of the press-fit hole 64 are difficult to be cut, and generation of shavings is prevented. . As a result, it is possible to prevent shavings from entering between the outer peripheral surface of the press-fit pin 56, which is the press-fit surface, and the inner peripheral surface of the press-fit hole 64, and to avoid a drop in the strength of the press-fit pin 56 from being lowered. Therefore, the orifice member 40 and the cover plate member 42 can be stably fixed with high strength.

  Since the tip inclined surface 58 and the opening inclined surface 66 can prevent the generation of shavings during the press-fitting of the press-fit pin 56 into the press-fit hole 64 in this way, a large press-fit capable of realizing a high pull-out strength of 0.5 kN or more. Even if the margin is set, the orifice member 40 and the cover plate member 42 can be stably put into a predetermined assembled state.

  In addition, in the state where the orifice member 40 and the cover plate member 42 are fixed, a waste accumulation portion 68 is formed between the opening inclined surface 66 of the cover plate member 42 and the base end portion of the press-fit pin 56. Even if swarf is generated by press-fitting the press-fitting pin 56 into the press-fitting hole 64, the swarf is stored in the scum reservoir 68 so that it is difficult to enter between the press-fitting surfaces. Therefore, it is possible to prevent the drag force (outgoing strength) against the insertion of the press-in pin 56 from the press-in hole 64 from being lowered due to the entry of shavings between the press-in surfaces. In particular, since the waste pool portion 68 is provided in the press-fit base end side opening portion of the press-fit pin 56 in the press-fit hole 64 of the cover plate member 42, shavings that are relatively likely to occur at the initial press-fit time are stored in the waste pool portion 68. Efficiently accommodated.

  FIG. 9 shows an engine mount 90 as a second embodiment of the fluid filled type vibration damping device structured according to the present invention. The engine mount 90 includes a partition member 92 shown in FIGS. 10 and 11, and the partition member 92 has a structure in which the orifice member 94 and the cover plate member 42 are fixed to each other. In the following description, members and portions that are substantially the same as those of the first embodiment are denoted by the same reference numerals in the drawings, and the description thereof is omitted.

  More specifically, a press-fit pin 96 is formed in the orifice member 94. The press-fit pin 96 protrudes upward from the upper surface of the orifice member 94. As shown in FIG. 12, a press-fit rib 100 is provided on the outer peripheral surface of the substantially cylindrical pin body 98. Yes. The press-fitting rib 100 is integrally protruded from the outer peripheral surface of the pin main body 98 toward the outer periphery. In the present embodiment, the press-fitting rib 100 gradually narrows toward the protruding tip, as shown in FIG. The ridges extend continuously over the entire length of the pin body 98.

  Furthermore, as shown in FIG. 12, the four press-fitting ribs 100 are provided at equal intervals in the circumferential direction on the outer peripheral surface of the pin main body 98, and two press-fitting ribs 100 provided on both sides in one radial direction of the pin main body 98. The press-fitting ribs 100, 100 project in the radial direction of the orifice member 94, and the two press-fitting ribs 100, 100 provided on both sides in one other radial direction of the pin body 98 are in the radial direction of the orifice member 94. It protrudes in a direction substantially orthogonal to (see FIG. 11). The press-fit pin 96 has a portion in which the outer diameter of the pin main body 98 is made smaller than the inner diameter of the press-fit hole 64 of the lid plate member 42 and press-fit ribs 100, 100 are formed on both radial sides of the pin main body 98. Then, the distance between the projecting tips of the press-fitting ribs 100, 100 is made larger than the inner diameter dimension of the press-fitting hole 64.

  The protruding tip of the press-fit pin 96 has a tapered shape with a small diameter toward the tip, and the outer peripheral surface is a tip inclined surface 58. The tip inclined surface 58 of the present embodiment is formed at the upper end of the pin body 98 and the four press-fitting ribs 100, 100, 100, 100 in the press-fit pin 96.

  The press-fit pin 96 is press-fitted into the press-fit hole 64 of the cover plate member 42. As shown in FIGS. 12 and 13, the press-fit pin 96 of the present embodiment is pressed against the inner peripheral surface of the press-fit hole 64 at the projecting tip portion of the press-fit rib 100, and the press-fit rib 100 is disengaged in the circumferential direction. The part is separated from the inner peripheral surface of the press-fitting hole 64 toward the inner peripheral side, and the press-fitting pin 96 is partially in the circumferential direction with respect to the press-fitting hole 64 at four places in the circumferential direction where the press-fitting ribs 100 project. It is press-fitted into.

  Further, a space (debris accumulation portion 68) extending in the circumferential direction is formed between the proximal end portion of the press-fit pin 96 and the opening inclined surface 66 of the press-fit hole 64 in the cover plate member 42. The waste accumulation portion 68 of the present embodiment is formed as a tunnel-like space extending in the circumferential direction in the formation portion of the press-fit ribs 100, 100, 100, 100 in the press-fit pin 96, and the press-fit ribs 100, 100, 100, 100. In a portion that is disengaged in the circumferential direction, it is opened upward through the space between the outer peripheral surface of the pin main body 98 and the inner peripheral surface of the press-fitting hole 64. Thereby, in this embodiment, after the orifice member 94 and the cover plate member 42 are assembled, it is possible to discharge the shavings accumulated in the debris accumulation portion 68 to the outside.

  According to such a structure according to the present embodiment, the plurality of press-fitting ribs 100 are integrally formed on the outer peripheral surface of the pin main body 98, and the outer diameter of the press-fitting pin 96 is press-fitted at a portion where the press-fitting ribs 100 are disengaged in the circumferential direction. The inner diameter of the press-fitting pin 96 is smaller than the inner diameter of the hole 64 and the outer diameter of the press-fitting pin 96 is larger than the inner diameter of the press-fitting hole 64 at the portion where the press-fitting rib 100 is formed. As a result, the press-fitting pin 96 is partially press-fitted in the circumferential direction into the press-fitting hole 64, so that the pressure input required for press-fitting the press-fitting pin 96 into the press-fitting hole 64 can be made relatively small. it can.

  In addition, since the outer diameter of the pin body 98 does not substantially affect the pressure input, there is no need to reduce the diameter of the pin body 98 in order to reduce the pressure input, while the deformation rigidity of the pin body 98 is set sufficiently large. Further, it is possible to reduce the pressure input when the press-fitting pin 96 is press-fitted into the press-fitting hole 64.

  Further, since the press-fitting ribs 100, 100, 100, 100, which are press-fitting portions of the press-fitting pin 96 into the press-fitting hole 64, are provided at substantially equal intervals in the circumferential direction, a reaction force acting on the press-fitting pin 96 at the time of press-fitting. Can be offset and the press-fitting operation can be facilitated.

  Further, two of the four press-fitting ribs 100, 100, 100, 100 of the press-fit pin 96 are arranged in the radial direction of the orifice member 94, and the other two are tangential directions substantially orthogonal to the radial direction of the orifice member 94. Are arranged. Thereby, the orifice member 94 and the cover plate member 42 are more firmly positioned in the radial direction and the tangential direction thereof. In particular, in this embodiment, press-fit pins 96 are provided at three locations in the circumferential direction of the orifice member 94, and the press-fit ribs 100, 100, 100, 100 are oriented in the orifice member 94 in each of the press-fit pins 96. Since the three press-fit pins 96, 96, 96 are set in the radial direction or the tangential direction, the projecting directions of the press-fit ribs 100, 100, 100, 100 are different from each other. Since the orifice member 94 and the cover plate member 42 are more firmly positioned in the projecting direction of the press-fit ribs 100, 100, 100, 100 in each press-fit pin 96, more orifice members 94 and cover plate members 42 are provided. It is positioned effectively in the direction perpendicular to the axis.

  The number of press-fit pins 96 is not necessarily limited to three, but may be one or two, or four or more. Further, the number of press-fitting ribs 100 in each press-fitting pin 96 is not particularly limited as long as it is plural, and can be changed as appropriate.

  As mentioned above, although embodiment of this invention was explained in full detail, this invention is not limited by the specific description. For example, the shape of the press-fit pin is not particularly limited. In addition to the substantially cylindrical shape shown in the first embodiment and the shape including the press-fit rib 100 shown in the second embodiment, a polygonal column shape or an elliptical column shape It may be. The shape of the press-fitting hole may be any shape as long as the press-fit pin can be press-fitted, and can be appropriately changed.

  Further, for example, a fillet portion may be provided at the base end portion of the press-fit pin 56, and the base end portion of the press-fit pin 56 may have a large diameter toward the base end side. Also in this case, a space (debris reservoir 68) extending in the circumferential direction is formed between the proximal end portion of the press-fit pin 56 having a fillet portion and the opening inclined surface 66 of the press-fit hole 64 of the cover plate member 42. be able to.

  The tip inclined surface 58 of the press-fit pin 56 may extend linearly in the longitudinal section with a substantially constant inclination angle, but the inclination angle may change toward the protruding tip, for example, toward the protruding tip. Thus, a curved inclined surface having a large inclination angle with respect to the projecting direction can be used. Note that the inclination angle of the opening inclined surface 66 in the press-fitting hole 64 of the cover plate member 42 can be similarly changed.

  Further, the orifice groove 48 is formed so as to open on the upper surface of the orifice member 40, and the orifice member 40 and the cover plate member 42 are fixed, so that the orifice groove 48 is covered with the cover plate member 42 and the orifice passage 84. May be formed so as to extend between the overlapping surfaces of the orifice member 40 and the cover plate member 42.

  In addition to the valve mechanism for preventing cavitation shown in the above embodiment, the movable member may be a movable plate structure or a movable film structure that prevents high dynamic springs when the orifice passage 84 is substantially closed. May be. Specifically, a movable plate that can be displaced in the thickness direction within the accommodation region 70 or a movable film whose outer peripheral end is supported by the orifice member 40 and the cover plate member 42 and can be deformed in the thickness direction is contained in the accommodation region 70. By disposing the pressure receiving chamber 80 and preventing the sealing of the pressure receiving chamber 80 by the displacement of the movable plate or the deformation of the movable film, it is possible to obtain a vibration insulation effect by reducing the dynamic spring.

  The lid plate member 42 of the above embodiment has a stepped disk shape with the inner peripheral portion positioned below the outer peripheral portion, but the lid plate member 42 may have a substantially flat plate shape without a step.

  The present invention can be applied not only to engine mounts but also to subframe mounts and the like. In addition to being applied to a fluid-filled vibration isolator for automobiles, the present invention can also be suitably applied to a fluid-filled vibration isolator used for motorcycles, railway vehicles, and the like.

10, 90: Engine mount (fluid-filled vibration isolator), 40, 94: Orifice member, 42: Cover plate member, 50: Open recess, 56, 96: Press-fit pin, 58: Inclined tip, 64: Press-fit Hole: 66: Inclined opening surface, 68: Debris reservoir, 70: Storage area, 72: Rubber valve (movable member), 80: Pressure receiving chamber (fluid chamber), 82: Equilibrium chamber (fluid chamber), 84: Orifice passage 98: Pin body, 100: Press-fit rib

Claims (7)

In a fluid-filled vibration isolator comprising an orifice member that is disposed between fluid chambers in which relative pressure fluctuations are generated when vibration is input and forms an orifice passage that communicates between the fluid chambers.
A lid plate member is superimposed on the orifice member, and a press-fitting pin protruding from the overlapping surface of the lid plate member in the orifice member is press-fitted into a press-fitting hole penetrating the lid plate member. The lid plate member is fixed in a state of being overlapped with the orifice member, and the tip portion of the press-fit pin is provided with a tip inclined surface having a small diameter toward the tip side, and the lid plate member A fluid-filled type vibration damping device, wherein an opening inclined surface having a large diameter toward the opening side is provided at an opening portion of the base end side into which the press-fitting pin is inserted.   2. The fluid filled type vibration damping device according to claim 1, wherein a waste accumulation portion is provided between the opening inclined surface of the lid plate member and a proximal end portion of the press-fitting pin press-fitted into the press-fitting hole.   The orifice member is provided with a movable member on which a fluid pressure is applied, and an opening recess provided in the central portion of the orifice member so as to open toward one of the fluid chambers is overlapped with the orifice member. A cover region of the movable member is formed by being covered with the cover plate member, and the orifice member and the cover plate member are inserted into the press-fitting hole of the press-fit pin provided on the outer peripheral side of the storage region. The fluid-filled vibration isolator according to claim 1 or 2, which is fixed in a state of being overlapped with each other by press fitting.   The press-fitting pin penetrates the press-fitting hole of the lid plate member, the tip of the press-fitting pin protrudes from the press-fitting hole, and the tip inclined surface of the press-fitting pin protrudes from the press-fitting hole. The fluid-filled type vibration damping device according to any one of claims 1 to 3, wherein the fluid-filled type vibration damping device is formed at a distal end portion.   The said orifice member is provided with the said several press-fit pin, and the said cover plate member is provided with the said some press-fit hole corresponding to these press-fit pins. Fluid-filled vibration isolator.   The press-fit pin includes a pin main body protruding from the orifice member and a plurality of press-fitting ribs protruding from the outer peripheral surface of the pin main body and extending in the protruding direction of the pin main body. 6. The fluid sealing according to claim 1, wherein the press-fitting hole is smaller than an inner size of the press-fitting hole, and a portion where the press-fitting rib is formed in the press-fitting pin is press-fitted and fixed to the press-fitting hole. Type vibration isolator.   The fluid-filled vibration isolator according to any one of claims 1 to 6, wherein a load necessary for removing the press-fit pin from the press-fit hole of the lid plate member is 0.5 kN or more.

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