JP5907785B2 - Engine mount - Google Patents

Description

  The present invention relates to an engine mount that is interposed between a power unit of an automobile and a vehicle body and supports the power unit in a vibration-proof manner with respect to the vehicle body.

  Conventionally, a plurality of engine mounts are interposed between a power unit of an automobile and a vehicle body, and the power unit is supported in an anti-vibration manner with respect to the vehicle body. Such an engine mount is generally a main rubber in which a first mounting member attached to the power unit side and a second mounting member attached to the vehicle body side are interposed therebetween and fixed by vulcanization adhesion or the like. The structure is connected by an elastic body. And the vibration-proof characteristic is exhibited by supporting the load from the power unit which is a vibration source with the main body rubber elastic body.

  By the way, the engine mount is required to have high heat resistance and rigidity because the use environment is high temperature and it is necessary to carry a shared load from the power unit. Therefore, the first mounting member and the second mounting member of the engine mount are generally formed of a metal material such as an aluminum alloy or steel. However, since such a metal material has a relatively high thermal conductivity, in a conventional engine mount, high heat of the power unit is easily transmitted from the first mounting member attached to the power unit side to the main rubber elastic body. Deterioration of the rubber elastic body of the main body due to heat transfer from the mounting member 1 is unavoidable, and the durability of the engine mount is impaired.

  In order to cope with this problem, Japanese Patent Laid-Open No. 9-242821 (Patent Document 1) discloses that the first mounting member itself is made of a metal plate having a relatively low thermal conductivity, A plurality of grooves are formed in the contact surface with respect to the bracket on the power unit side, and a gap is provided between the contact surfaces of the first mounting bracket and the bracket, thereby reducing heat conduction from the bracket to the first mounting bracket. A configuration to be made is proposed.

  However, since a metal material such as stainless steel having a relatively low thermal conductivity is more expensive than steel and the like, the entire first mounting member made of such a metal material increases the manufacturing cost. Is undesirable. Further, if a plurality of grooves are formed to provide gaps between the contact surfaces of the first mounting bracket and the bracket, there is a concern that the strength of the first mounting bracket itself may be reduced, and the support rigidity required for the engine mount However, it was difficult to say that it was an effective measure.

  JP-A-2000-88029 (Patent Document 2) proposes a structure in which a separate heat insulating plate is interposed between the first mounting member and the power unit side bracket. However, since such a heat insulating plate is a separate body, it is easy to come off from the first attachment member in the assembly process to the vehicle, and handling becomes troublesome. Further, the assembly position of the separate heat insulating plate is likely to vary depending on the operator, and there is a problem that it is difficult to manage the heat insulating performance and the fixing force with respect to the bracket at each engine mount.

Japanese Patent Laid-Open No. 9-242821 JP 2000-88029 A

  The present invention has been made in the background of the above-mentioned circumstances, and the solution is to reduce the heat transfer from the first mounting member while ensuring the strength of the member and the assembly stability to the vehicle. Another object of the present invention is to provide an engine mount having a novel structure that can reduce deterioration of a rubber elastic body.

  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.

According to a first aspect of the present invention, in the engine mount in which a first attachment member attached to the power unit side and a second attachment member attached to the vehicle body side are connected by a main rubber elastic body, the first attachment with respect to the mounting portion of the power unit side of the member, the thermal conductivity than the first mounting member has a lower heat insulating member are integrally fixed by fixing means, heat insulating member is first A mounting surface is provided that is positioned on the power unit side of the mounting member and is directly overlapped and mounted on the power unit, and a surface of the first mounting member to which the heat insulating member is not fixed is configured as described above. It is characterized in that it is directly bonded to the main rubber elastic body .

  According to the present invention, the bracket on the power unit side and the first mounting member are fixed via the heat insulating member. Thereby, heat transfer from the power unit to the first mounting member can be reduced, and heat transfer from the first mounting member to the main rubber elastic body can be reduced. As a result, the thermal deterioration of the main rubber elastic body can be reduced, and the durability of the engine mount can be improved.

  In particular, instead of forming the entire first mounting member with a heat insulating member, it is possible to configure only a portion that directly contacts a heat source such as a bracket on the power unit side with a heat insulating member, which increases the manufacturing cost. While suppressing, the durability of the engine mount can be improved. In addition, the heat insulating member is fixed to and integrated with the first mounting member by the fixing means. Therefore, the member strength of the first mounting member can be secured stably, and the fixed state to the power unit can be stably maintained. Further, since the heat insulating member is integrated with the first mounting member by the fixing means, the heat insulating member may fall off the first mounting member when the engine mount is fixed to the power unit side bracket or the vehicle body. There are few, and the assembly work to the vehicle of an engine mount can be made easy. As a result, it is possible to solve the problems of the heat insulation performance due to the variation during the assembly work and the variation in the fixing force to the bracket on the power unit side, and the assembly to the vehicle can be performed easily and stably.

  As the heat insulating member, various members can be adopted as long as they have a thermal conductivity lower than that of the first mounting member, but preferably a metal material in order to ensure strength. Is used. Further, as the fixing means, for example, when the first mounting member is cast, the heat insulating member is set in the mold and the molten metal of the first mounting member is poured to fix the first mounting member to the first mounting member. Arbitrary means may be employed, such as caulking and fixing one of the first mounting member and the heat insulating member to the other, or pressing and fixing the heat insulating member into the first mounting member.

  A second aspect of the present invention is the one described in the first aspect, wherein the heat insulating member is formed of stainless steel.

  Since stainless steel has a lower thermal conductivity than aluminum or iron generally used as the first mounting member, heat transfer to the first mounting member can be advantageously reduced. Further, the processing can be easily performed.

  According to a third aspect of the present invention, in the first or second aspect, the first attachment member has a solid rod shape, and one axial direction of the first attachment member is one. Is fixed in an embedded state to the main rubber elastic body, while the other end in the axial direction of the first mounting member is formed with a flange-like portion that extends in the direction perpendicular to the axis, The mounting portion is constituted by the flange-shaped portion.

  According to this aspect, in the first mounting member, the power unit side mounting portion is located at the end portion in the axial direction that is farthest from the main rubber elastic body, and therefore, the power unit via the first mounting member. The heat transfer from the main rubber elastic body to the main body can be advantageously reduced. Furthermore, since the heat insulating member can be fixed to the flange-like portion which is a flat region extending in the direction perpendicular to the axis of the first mounting member, the heat insulating member can be stably fixed to the mounting portion.

  According to a fourth aspect of the present invention, in the above-described third aspect, the first attachment member is formed with an accommodation recess that opens on the upper surface of the flange-shaped portion. The heat insulating member is accommodated in the recess, the outer peripheral edge of the heat insulating member is surrounded by the first mounting member, and the upper surface of the heat insulating member is above the upper surface of the flange-shaped portion. In a protruding state, the heat insulating member is fixed to the flange-like portion by the fixing means.

  According to this aspect, since the heat insulating member is fixed to the first attachment member in the accommodated state in the accommodation recess, the secured state to the first attachment member can be more stably ensured. In addition, since the outer peripheral edge of the heat insulating member is surrounded by the first mounting member, the heat accumulated in the heat insulating member is transferred to the atmosphere in the flange-shaped portion by utilizing the heat dissipation of the first mounting member. It is possible to dissipate heat from the exposed surface.

  Furthermore, since the upper surface of the heat insulating member is positioned above the upper surface of the flange-shaped portion, the first mounting member and the bracket, etc. A gap can be provided between them. Thus, direct heat transfer from the bracket or the like to the first mounting member can be prevented, and thermal deterioration of the main rubber elastic body can be further reliably reduced. In particular, since it is possible to provide a gap between the bracket on the power unit side and the flange-like portion without providing a groove or the like in the first mounting member, the rigidity and support of the first mounting member Heat transfer from the power unit side can be reduced without a decrease in strength.

  According to a fifth aspect of the present invention, in the above-described fourth aspect, an engaging portion that protrudes outward is formed on the outer peripheral edge portion of the heat insulating member, while the accommodating recess is defined. The peripheral wall portion is bent toward the locking portion and fixed by caulking, and the fixing means is constituted by the locking portion and the peripheral wall portion fixed by caulking to the locking portion. is there.

  In this aspect, the heat insulating member is fixed to the mounting portion of the first mounting member by caulking. Therefore, the heat insulating member can be reliably and easily fixed by a relatively simple method.

  According to a sixth aspect of the present invention, in the above-described fourth aspect, a locking portion that protrudes outward is formed at an outer peripheral edge portion of the heat insulating member, and defines the receiving recess. The peripheral wall portion is cast so as to surround the outer peripheral edge portion of the heat insulating member along the locking portion, and the fixing means is formed by the locking portion and the peripheral wall portion cast around the locking portion. Is configured.

  In this aspect, the first mounting member is cast using the heat insulating member as an insert. Thereby, in the 1st attachment member, the surrounding wall part which surrounds a heat insulation member can be easily stuck to the heat insulation member over the perimeter, and the attachment part of the 1st attachment member of a heat insulation member can be made. Fixing can be performed reliably and easily, and a strong and stable fixing state can be obtained.

  According to a seventh aspect of the present invention, in the above-described fourth aspect, a peripheral edge portion of the heat insulating member is press-fitted and fixed to a peripheral wall portion defining the housing recess, and the heat insulating member and The fixing means is constituted by the pressure contact of the peripheral wall portion.

  In this aspect, the fixing means is realized by the press contact between the peripheral edge portion and the peripheral wall portion of the heat insulating member. Thereby, it is possible to more easily and quickly fix the heat insulating member to the first mounting member with a simple configuration.

  An eighth aspect of the present invention is the one according to the third aspect, wherein the heat insulating member is fixed so as to cover the entire upper surface of the flange-like portion.

  According to this aspect, since the entire upper surface of the flange-shaped portion of the first mounting member is covered with the heat-insulating member, the heat-insulating member is entirely provided between the opposing surfaces of the power unit-side bracket and the flange-shaped portion. Can intervene. Therefore, the heat transfer from the power unit side to the first mounting member can be reduced more effectively, and the thermal deterioration of the main rubber elastic body can be more reliably reduced.

  In the present invention, a heat insulating member having a lower thermal conductivity than that of the first mounting member is fixed to and integrated with the mounting portion of the first mounting member on the power unit side by the fixing means. Accordingly, heat transfer from the power unit to the first mounting member can be reduced, and heat transfer from the first mounting member to the main rubber elastic body can be reduced. As a result, the thermal degradation of the main rubber elastic body can be reduced and the durability of the engine mount can be improved. Furthermore, since the heat insulating member is integrated with the first mounting member using the fixing means, the strength of the first mounting member and the mounting stability to the vehicle can be ensured.

Sectional drawing which shows the assembly | attachment state to the vehicle of the engine mount as 1st embodiment of this invention. Sectional drawing of the engine mount as 2nd embodiment of this invention. Sectional drawing of the engine mount as 3rd embodiment of this invention. Sectional drawing of the engine mount as 4th embodiment of this invention. Sectional drawing of the engine mount as 5th embodiment of this invention.

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

  FIG. 1 shows an engine mount 10 as a first embodiment of the present invention. The engine mount 10 has a structure in which a first mounting member 12 and a second mounting member 14 are connected by a main rubber elastic body 16. The first attachment member 12 is attached to a bracket 18 provided on the power unit side, and the second attachment member 14 is attached to a vehicle body (not shown) so that the power unit is supported by the vehicle body in a vibration-proof manner. It has become. In the following description, the axial direction and the vertical direction refer to the vertical direction in FIG. 1 in principle.

  More specifically, the first mounting member 12 is a high-rigidity member made of a metal material such as aluminum or iron, and is made of aluminum in the present embodiment. The first mounting member 12 has a substantially circular rod shape that is solid and extends in the vertical direction. On the central axis of the first mounting member 12, a bolt hole 20 is formed in which an inner peripheral surface is threaded, and the bolt hole 20 is opened on the upper surface 22 of the first mounting member 12. Yes. Further, a flange-like portion 24 that protrudes in the direction perpendicular to the axis and extends over the entire circumference is integrally formed at the upper end portion of the first mounting member 12.

  The flange-like portion 24 is formed with an accommodation recess 26 that extends around the central axis of the first mounting member 12 with a substantially constant cross section. The housing recess 26 is formed continuously over the entire circumference of the first mounting member 12 with a certain substantially rectangular cross section opening on the upper surface 22 of the first mounting member 12, and opens to the upper surface 22. It is a circular concave groove shape.

  A heat insulating member 28 is housed in the housing recess 26. The heat insulating member 28 is made of a material having a lower thermal conductivity than that of the first mounting member 12, and is preferably made of a metal material in order to ensure member strength. In the present embodiment, since the first mounting member 12 is made of aluminum (thermal conductivity: 236 W / mk), the heat insulating member 28 has a smaller thermal conductivity than aluminum, for example, austenitic stainless steel. (SUS304, thermal conductivity: 16 W / mk) or the like.

  The heat insulating member 28 has a predetermined thickness dimension (vertical direction dimension in FIG. 1): t, and has a substantially annular shape with a central hole 30 penetrating through the central axis. The heat insulating member 28 is continuously formed in the circumferential direction with a certain substantially rectangular cross-sectional shape, and protrudes outward in the radial direction (left and right direction in FIG. 1) at the lower end edge of the outer peripheral edge portion 32. The locking part 34 is formed continuously over the entire circumference. Such a heat insulating member 28 may be formed by casting or cutting, or after cutting out from a long cylindrical shape with a predetermined thickness dimension: t, the upper edge of the outer peripheral edge 32 is tapped. Alternatively, the locking portion 34 may be formed by reducing the diameter by cutting or the like.

  The thickness dimension t of the heat insulating member 28 is preferably 5 mm to 20 mm, more preferably, in order to effectively exhibit the heat insulating effect described later without impairing the member strength of the first mounting member 12. , 7 mm to 18 mm. The thickness dimension of the heat insulating member 28: By setting t to 5 mm or more, the first attachment from the bracket 18 is interposed between the bracket 18 and the first attachment member 12 described later with a predetermined thickness dimension. The heat conduction to the member 12 can be effectively reduced. Further, even if the thickness dimension of the heat insulating member 28: t is thicker than 20 mm, since the improvement of the heat insulating effect is poor, it is effective by suppressing the thickness dimension: t of the heat insulating member 28 to 20 mm or less. The material cost of the heat insulating member 28 can be reduced while ensuring the heat insulating effect. At the same time, it is possible to prevent the first mounting member 12 from becoming relatively small by increasing the size of the heat insulating member 28, and to secure the member strength of the first mounting member 12.

  Such a heat insulating member 28 is fixed to the first attachment member 12 in a state of being accommodated in the accommodation recess 26 of the first attachment member 12. In the present embodiment, the first mounting member 12 is formed in a state where the heat insulating member 28 is embedded in the flange-shaped portion 24 by casting the first mounting member 12 using the heat insulating member 28 as an insert. It has become so. That is, the heat insulating member 28 separately formed in advance is set in the mold of the first mounting member 12, and the molten metal of the first mounting member 12 is poured to cast the first mounting member 12. Thereby, the heat insulating member 28 is fixed to the flange-like portion 24 of the first mounting member 12 and integrated with the first mounting member 12.

  When the molten metal of the first mounting member 12 is poured into the mold, the molten metal is introduced to the outer peripheral edge portion 32 of the heat insulating member 28, and the peripheral wall portion 36 that defines the outside of the housing recess 26 is cast. The Thereby, the surrounding wall part 36 is cast so that the outer peripheral edge part 32 may be surrounded over the perimeter along the latching | locking part 34 of the heat insulation member 28. FIG. And the upper end edge part of the surrounding wall part 36 protrudes radially inward so that it may turn above the latching | locking part 34, and is engaged with the latching | locking part 34 in the up-down direction. Thereby, the heat insulating member 28 is fixed to the first mounting member 12 so as not to be pulled out upward. As described above, the locking portion 34 and the peripheral wall portion 36 constitute fixing means for fixing the heat insulating member 28 to the first mounting member 12.

  The heat insulating member 28 is embedded in the first mounting member 12 so as to partially enter the inside of the first mounting member 12, and the first mounting member 12 and the heat insulating member 28 are arranged in the vertical direction. They enter each other and are fixed to each other. In a state of being fixed to the first mounting member 12, the heat insulating member 28 is disposed on the same central axis as the first mounting member 12, and the bolt hole 20 is directed upward through the central hole 30 of the heat insulating member 28. It is open. Particularly in the present embodiment, the central portion of the first mounting member 12 is inserted into the central hole 30, the upper surface 22 is positioned in the central hole 30, and the opening edge 37 of the bolt hole 20 is It is located in the central hole 30. Further, the upper surface 38 of the heat insulating member 28 protrudes above the upper surface 22 of the first mounting member 12 that becomes the upper surface of the flange-shaped portion 24, and is positioned slightly above the upper surface 22.

  On the other hand, the second mounting member 14 is a high-rigidity member having a thin, large-diameter, generally cylindrical shape, and is provided with a stepped portion 40 at an intermediate portion in the axial direction, and the upper side across the stepped portion 40 is large. While being a diameter cylinder part 42, the lower side is a small diameter cylinder part 44 across the step part 40.

  The first mounting member 12 and the second mounting member 14 having such a structure are disposed on the same central axis, and the first mounting member 12 is disposed above the second mounting member 14. The The first attachment member 12 and the second attachment member 14 are elastically connected by a main rubber elastic body 16.

  The main rubber elastic body 16 has a thick-walled large-diameter substantially truncated cone shape, and the end portion on the small-diameter side (upper side) is vulcanized and bonded to the first mounting member 12, and the large-diameter side ( The outer peripheral surface of the lower side end portion is overlapped with the inner peripheral surface of the second mounting member 14 and vulcanized and bonded. The main rubber elastic body 16 is bonded to the outer peripheral surface below the flange-like portion 24 of the first mounting member 12, whereby the first mounting member 12 is connected to the lower end in the axial direction. Is fixed to the main rubber elastic body 16 in an embedded state, and the peripheral wall portion 36 located at the outer portion of the flange-shaped portion 24 is located outside the main rubber elastic body 16 and exposed to the atmosphere. . In this way, the main rubber elastic body 16 is formed as an integrally vulcanized molded product including the first mounting member 12 and the second mounting member 14.

  At the lower end of the main rubber elastic body 16, a large-diameter recess 46 having a substantially mortar shape in the opposite direction is formed and opened on the lower surface of the main rubber elastic body 16. Furthermore, from the outer peripheral side of the large-diameter recess 46 in the main rubber elastic body 16, a seal rubber layer 48 is integrally formed and extends downward, and the inside of the small-diameter cylindrical portion 44 of the second mounting member 14. It is superimposed on the peripheral surface and vulcanized.

  A flexible film 50 is attached to the second attachment member 14. The flexible film 50 is a rubber elastic body having a thin and large-diameter substantially disk shape, and has sufficient slackness in the axial direction. Further, the outer peripheral surface of the flexible film 50 is overlapped with the annular fixing member 52 and vulcanized and bonded. Then, after the fixing member 52 is inserted into the lower end portion of the small-diameter cylindrical portion 44 of the second mounting member 14, the second mounting member 14 is subjected to diameter reduction processing such as eight-way drawing, which is possible. The flexible film 50 is attached to the second attachment member 14.

  By attaching the flexible film 50 to the second attachment member 14 in this way, the upper opening of the second attachment member 14 is closed by the main rubber elastic body 16, and the second attachment member 14. The lower opening is closed by the flexible membrane 50. As a result, a fluid sealing region 54 separated from the outside is formed between the axially opposing surfaces of the main rubber elastic body 16 and the flexible membrane 50, and incompressible fluid is sealed therein. The incompressible fluid sealed in the fluid sealing region 54 is not particularly limited, but water, alkylene glycol, polyalkylene glycol, silicone oil, or a mixed solution thereof is preferably employed. In particular, a low-viscosity fluid of 0.1 Pa · s or less is desirable in order to effectively obtain an anti-vibration effect based on the fluid flow action described below.

  A partition member 56 is disposed in the fluid sealing region 54. The partition member 56 has a thick and large-diameter substantially disk shape, and is formed of, for example, a metal material, a hard synthetic resin material reinforced with fiber, or the like. The outer peripheral portion 58 of the partition member 56 is thicker than the central portion, and has a large-diameter annular shape extending over the entire circumference in the circumferential direction. The outer peripheral portion 58 is formed with a circumferential groove 60 that opens to the outer peripheral surface and extends a length of slightly less than two.

  Such a partition member 56 is accommodated in the fluid sealing region 54 and supported by the second mounting member 14. More specifically, the partition member 56 is inserted into the small-diameter cylindrical portion 44 of the second mounting member 14, and the outer peripheral portion 58 is positioned so as to overlap the lower end surface of the main rubber elastic body 16. This is fixed to the second mounting member 14 together with the fixing member 52 by the diameter reduction processing. As a result, the partition member 56 is disposed so that the outer peripheral portion thereof is supported by the second mounting member 14 and spreads in the axial direction in the fluid sealing region 54.

  By disposing the partition member 56, the fluid sealing region 54 is vertically divided into two with the partition member 56 interposed therebetween. Thereby, on the upper side across the partition member 56, a part of the wall portion is constituted by the main rubber elastic body 16, and a pressure receiving chamber 62 in which an internal pressure fluctuation is exerted upon vibration input is formed, and the partition member 56. A part of the wall portion is formed of the flexible film 50 and a balance chamber 64 in which volume change is easily allowed is formed on the lower side of the wall. The pressure receiving chamber 62 and the equilibrium chamber 64 are filled with an incompressible fluid sealed in the fluid sealing region 54.

  Further, the outer peripheral surface of the partition member 56 is overlapped with the inner peripheral surface of the second mounting member 14 via the seal rubber layer 48. Thereby, the outer peripheral opening of the circumferential groove 60 is fluid-tightly closed by the second mounting member 14, and a tunnel-like flow path extending in the circumferential direction is formed. One end of this tunnel-shaped flow path is connected to the pressure receiving chamber 62 through a communication hole 66 formed in the partition member 56, and the other end is formed in the partition member 56 (not shown). It communicates with the equilibration chamber 64 through the communication hole. Thus, an orifice passage 68 that communicates the pressure receiving chamber 62 and the equilibrium chamber 64 with each other is formed using the circumferential groove 60. The communication hole 66 opened in the pressure receiving chamber 62 is formed in a communication projecting portion 70 projecting upward from the partition member 56 and opens toward the inner peripheral side of the orifice passage 68.

  The engine mount 10 having such a structure is formed of a metal material such as iron or aluminum or a synthetic resin material, and the bracket 18 provided on the power unit side is attached to the flange-like portion 24 of the first mounting member 12. The first mounting member 12 is attached to the power unit side by being overlapped and screwed into the bolt hole 20 with the fixing bolt 74 inserted into the bolt insertion hole 72 penetrating the bracket 18. Thus, in the present embodiment, the flange-shaped portion 24 is a mounting portion on the power unit side of the first mounting member 12. At the same time, the second attachment member 14 is attached to the vehicle body side (not shown) via a bracket (not shown). As a result, the power unit is supported by the vehicle body in a vibration-proof manner via the engine mount 10.

  When vibration is input in the vertical direction between the first mounting member 12 and the second mounting member 14 in the mounted state of the engine mount 10, the internal pressure is applied to the pressure receiving chamber 62 due to elastic deformation of the main rubber elastic body 16. Variations are produced. Then, based on the relative pressure difference between the pressure receiving chamber 62 and the equilibrium chamber 64, the fluid flow through the orifice passage 68 is generated, so that the intended vibration isolation effect is exhibited based on the flow action. It is like that.

  In this embodiment, the bracket 18 on the power unit side is fixed to the first mounting member 12 in a state of being superimposed on the upper surface 38 of the heat insulating member 28, and the bracket 18 is connected to the first through the heat insulating member 28. 1 fixing member 12 is fixed. Thereby, it can reduce that the heat of the bracket 18 which uses a power unit etc. as a heat source is transmitted to the 1st attachment member 12, and it is to the main rubber elastic body 16 fixed to the 1st attachment member 12. Heat transfer can be reduced. As a result, the thermal degradation of the main rubber elastic body 16 can be reduced and the durability of the engine mount 10 can be improved.

  In particular, since the upper surface 38 of the heat insulating member 28 is located above the upper surface 22 of the flange-like portion 24 of the first mounting member 12, the bracket 18 is in contact with only the heat insulating member 28, and the first The mounting member 12 is in a non-contact state with a gap 76 therebetween. Thereby, the heat transfer from the bracket 18 to the 1st attachment member 12 can be reduced more effectively. As a heat transfer path from the bracket 18 to the first mounting member 12, a path through the fixing bolt 74 may be considered, but the contact between the screw formed on the fixing bolt 74 and the screw formed on the bolt hole 20. Since the area is actually sufficiently small, the heat transfer from the fixing bolt 74 is sufficiently small. In addition, the entire first mounting member 12 is not formed of a heat insulating material, but the heat insulating member 28 is used only in a portion where the bracket 18 abuts, thereby suppressing an increase in manufacturing cost and durability of the engine mount 10. Can be improved.

  Further, since the bracket 18 is attached to the flange-like portion 24 that is positioned farthest from the main rubber elastic body 16 in the first mounting member 12, the bracket 18 is as far as possible from the main rubber elastic body 16. Therefore, the heat transfer from the bracket 18 to the main rubber elastic body 16 can be more advantageously reduced. Further, the peripheral wall portion 36 of the flange-like portion 24 is exposed to the atmosphere. As a result, heat can be radiated into the atmosphere using the surface area of the peripheral wall portion 36 that has higher heat dissipation than the heat insulating member 28, and heat transfer to the main rubber elastic body 16 can be further reduced. And the arrangement | positioning space of the heat insulation member 28 can also be advantageously ensured by arrange | positioning the heat insulation member 28 in the flange-shaped part 24 which spreads in an axial direction.

  In addition, by casting the first mounting member 12 by embedding the heat insulating member 28, the peripheral wall portion 36 that locks the locking portion 34 of the heat insulating member 28 is cast and the fixing means is configured. Can be formed in close contact with the outer surface of the heat insulating member 28, and the heat insulating member 28 can be firmly fixed to the first mounting member 12. Since the heat insulating member 28 is firmly fixed to the first mounting member 12 and integrated with the first mounting member 12, the heat insulating member 28 is attached to the first mounting member when the engine mount 10 is assembled to the vehicle. There is little possibility of dropping off from the member 12, and the support strength of the power unit can be stably secured. In particular, the first mounting bracket 12 is inserted into the central hole 30 of the heat insulating member 28, and the opening edge 37 of the bolt hole 20 is as close to the bracket 18 as possible while ensuring a gap 76. Therefore, the fixing force of the bracket 18 can be secured more stably. Further, since the fixing bolt 74 is screwed to the first mounting member 12 through the central hole 30 of the heat insulating member 28 and is not fixed to the heat insulating member 28, the bracket 18 is caused by vibration or the like during traveling of the vehicle. Even when displaced upward, no tensile force is exerted on the heat insulating member 28, and the state in which the heat insulating member 28 is fixed to the first mounting member 12 can be stably maintained.

  Next, FIG. 2 shows an engine mount 80 as a second embodiment of the present invention. Each embodiment described below is different only in the specific shapes of the first mounting member and the heat insulating member and the specific mode of the fixing means for fixing them to each other. Since the same configuration as that of the first embodiment can be adopted, in the following description, members or parts having substantially the same structure as the first embodiment are denoted by the same reference numerals in the drawings. The description is omitted by attaching.

  That is, the heat insulating member 82 in the present embodiment has an annular shape that is substantially the same as that of the first embodiment, and a locking portion 34 that protrudes outward in the axial direction is formed at the lower end portion thereof. Has been. On the other hand, the flange-like portion 24 of the first mounting member 84 is formed with a housing recess 86 that opens upward in a circular shape, and the outer side of the housing recess 86 is defined by the peripheral wall portion 36. Yes. And the heat insulation member 82 is accommodated in the accommodation recess 86, and the upper end part of the surrounding wall part 36 is bent and caulked to the engaging part 34 side, so that the upper end part of the surrounding wall part 36 is against the engaging part 34. The heat insulating member 82 is caulked and fixed to the first mounting member 12 so as to be integrated. As described above, in this embodiment, the locking portion 34 and the peripheral wall portion 36 constitute a fixing means.

  Note that the upper surface 38 of the heat insulating member 82 is slightly more than the upper surface 22 of the flange-shaped portion 24 formed by the upper edge of the peripheral wall portion 36 by bending the upper end portion of the peripheral wall portion 36 toward the locking portion 34. Projecting upward. In the present embodiment, the bolt hole 20 is opened on the bottom surface 88 of the receiving recess 86, and the opening edge 37 of the bolt hole 20 is positioned below the heat insulating member 82. As in the first embodiment, the housing recess 86 is an annular groove corresponding to the heat insulating member 82, so that the first mounting member 12 enters the center hole 30 and the bolt hole 20. The opening edge 37 may be positioned in the central hole 30.

  In the engine mount 80 as well, the power unit bracket 18 (see FIG. 1) is attached to the first attachment member 84 and the second attachment member 14 is attached to the vehicle body, as in the first embodiment. It is attached. In this embodiment, since the caulking structure is adopted as the fixing means for fixing the heat insulating member 82 to the first mounting member 12, the heat insulating member 82 is attached to the first mounting member 12 by a simple method. It can be easily and quickly fixed.

  Next, FIG. 3 shows an engine mount 90 as a third embodiment of the present invention. In the present embodiment, the housing recess 94 formed in the flange-like portion 24 of the first mounting member 92 opens upward and extends in a ring shape around the central axis of the first mounting member 92. It is formed continuously over the entire circumference with a constant rectangular cross-sectional shape. The outer side of the accommodation recess 94 is defined by a peripheral wall portion 36 formed on the outer side of the flange-like portion 24. On the other hand, the heat insulating member 96 has an annular shape that is continuous over the entire circumference with a constant rectangular cross-sectional shape.

  Then, the heat insulating member 96 is press-fitted into the housing recess 94, and the outer peripheral edge 32 of the heat insulating member 96 is pressed against the peripheral wall portion 36, whereby the heat insulating member 96 is fixed to the first mounting member 12 and the first mounting member 12 is fixed. The mounting member 12 is integrated. In the present embodiment as well, the upper surface 38 of the heat insulating member 96 is positioned slightly above the upper surface 22 of the flange-shaped portion 24 in a press-fitted and fixed state in the receiving recess 94. Further, the upper surface 22 of the flange-shaped portion 24 is positioned in the central hole 30 of the heat insulating member 96, and the opening edge portion 37 of the bolt hole 20 is positioned in the central hole 30.

  In the present embodiment, the fixing means is configured by press-fitting the heat insulating member 96 into the housing recess 94 and press-contacting it with the peripheral wall portion 36 of the housing recess 94. In this way, the heat insulating member 96 can be easily and quickly fixed by the first mounting member 12 with a simple configuration. Also in the present embodiment, the bracket 18 on the power unit side is fixed only to the first mounting member 12 by the fixing bolt 74 (see FIG. 1) and is not fixed to the heat insulating member 96. Even when displaced upward, it is avoided that an upward pulling force acts on the heat insulating member 96, and the heat insulating member 96 is fixed to the first mounting member 12 with a simple configuration, and the fixed state is stable. Can be maintained.

  FIG. 4 shows an engine mount 100 as a fourth embodiment of the present invention. The first mounting member 102 of the present embodiment is formed with a press-fit hole 104 that opens upward and extends on the central axis of the first mounting member 102. The upper surface 22 of the first mounting member 102 is a flat surface throughout. On the other hand, the heat insulating member 106 has a structure in which a disc-shaped disc portion 108 extending in the direction perpendicular to the axis and a cylindrical rod-like portion 110 protruding on the central axis of the disc portion 108 are integrally formed. . The disc portion 108 has a disc shape having an outer diameter equal to that of the flange-like portion 24 of the first mounting member 102. Further, a bolt hole 112 is formed on the central axis of the rod-shaped portion 110 and opens on the upper surface 114 of the disc portion 108.

  The rod-shaped portion 110 of the heat insulating member 106 is press-fitted into the press-fitting hole 104 of the first mounting member 102, so that the heat insulating member 106 is fixed to the first mounting member 102. As described above, in this embodiment, the fixing means includes the press-fitting hole 104 of the first mounting member 102 and the rod-shaped portion 110 of the heat insulating member 106. In the state of being fixed to the first mounting member 102, the disk portion 108 of the heat insulating member 106 is overlapped with the upper surface 22 of the flange-shaped portion 24 of the first mounting member 102 to cover the entire upper surface 22. ing. Further, the bolt hole 112 of the heat insulating member 106 is positioned on the central axis of the first mounting member 102.

  In the engine mount 100 having such a structure, the bracket 18 (see FIG. 1) on the power unit side is overlapped with the disk portion 108 of the heat insulating member 106 and the bracket is substantially the same as in the first embodiment. The fixing bolt 74 inserted into the 18 bolt insertion holes 72 is screwed into the bolt holes 112 of the heat insulating member 106, whereby the bracket 18 is fixed to the first mounting member 102 via the heat insulating member 106. As a result, the disk portion 108 of the heat insulating member 106 is interposed between the bracket 18 and the first mounting member 102 so that heat transfer from the bracket 18 to the first mounting member 102 can be reduced. . In this embodiment, since the entire upper surface 22 of the first mounting member 102 is covered with the disk portion 108 of the heat insulating member 106, a larger contact area between the bracket 18 and the heat insulating member 102 is ensured. In addition, the heat insulating member 102 can be interposed between the opposing surfaces of the bracket 18 and the first mounting member 102, so that a more excellent heat insulating effect can be obtained. In addition, since a large contact area between the bracket 18 and the heat insulating member 106 can be secured, the bracket 18 can be stably fixed by the first mounting member 12. Furthermore, since the fixing bolt 74 for fixing the bracket 18 is screwed into the bolt hole 112 formed in the heat insulating member 102, heat transfer to the first mounting member 12 through the fixing bolt 74 is more effective. It can be reduced.

  Next, FIG. 5 shows an engine mount 120 as a fifth embodiment of the present invention. As for the 1st attachment member 122 in this embodiment, the upper surface 22 of the flange-shaped part 24 is made into the flat surface over the whole. On the other hand, the heat insulating member 124 has a substantially annular plate shape having an outer diameter that is slightly larger than the flange-shaped portion 24 of the first mounting member 122. A caulking piece 126 protruding downward is integrally formed at the outer peripheral edge of the heat insulating member 124. The caulking piece 126 may be formed continuously over the entire circumference of the heat insulating member 124 or may be formed intermittently in the circumferential direction.

  The heat insulating member 124 is superimposed on the upper surface 22 of the first mounting member 122, and the caulking piece 126 is bent and caulked from the outside to the inside of the flange-shaped portion 24. As a result, the heat insulating member 124 is fixedly integrated with the first mounting member 122. As described above, in this embodiment, the fixing means is configured to include the caulking piece 126 and the flange-like portion 24 with which the caulking piece 126 is engaged. In the fixed state to the first mounting member 122, the heat insulating member 124 is overlapped over the entire upper surface 22 of the first mounting member 122.

  Even in the engine mount 120 having such a structure, a large contact area between the bracket 18 and the heat insulating member 124 can be secured, and the heat insulating member 124 is interposed between the bracket 18 and the first mounting member 122. Therefore, more excellent heat insulation can be obtained. The heat insulating member 124 can be easily fixed to the first mounting member 122 with a simple structure in which the caulking piece 126 of the heat insulating member 124 is caulked and fixed to the flange-shaped portion 24. In particular, by skillfully using the flange-like portion 24, the caulking piece 126 can be caulked and fixed with a simple structure. As is apparent from the present embodiment, as the fixing means, the heat insulating member 124 side can be fixed by caulking and fixing to the first mounting member 122.

  As mentioned above, although embodiment of this invention was explained in full detail, this invention is not limited by the specific description. For example, it is needless to say that the specific mode of the fixing means for fixing the heat insulating member to the first mounting member is not limited to the mode described in each of the above embodiments. Specifically, as in the first embodiment, when the first mounting member is cast by embedding the heat insulating member, a recess is provided in the outer peripheral edge of the heat insulating member, and the first recess is provided in the recess. The heat insulating member may be fixed to the first mounting member by inserting and locking the molten metal of the mounting member.

  Further, the specific shapes of the heat insulating member and the first mounting member are not limited to the shapes described in the above embodiments. For example, the heat insulating member in each of the embodiments has an annular shape or a disk shape continuous in the circumferential direction, but the heat insulating member may be provided intermittently in the circumferential direction.

  Furthermore, the present invention can be widely applied to various engine mounts. For example, as described in Japanese Patent Application Laid-Open No. 2009-243511, the movable plate is slightly displaced between the pressure receiving chamber and the equilibrium chamber. A fluid pressure absorbing mechanism that can be arranged in a manner that can be arranged, or a device that can switch a plurality of orifice passages with an electromagnetic or negative pressure actuator, as described in JP 2009-52591 A, etc. The present invention can be applied to not only a fluid-filled engine mount but also an engine mount that does not have an incompressible fluid-filled region as described in JP-A-2007-255530. Is also possible.

10, 80, 90, 100, 120: engine mount, 12, 84, 92, 102, 122: first mounting member, 14: second mounting member, 16: main rubber elastic body, 18: bracket, 22: Upper surface (first mounting member), 24: flange-shaped portion, 26, 86, 94: receiving recess, 28, 82, 96, 106, 124: heat insulating member, 32: outer peripheral edge portion, 34: locking portion ( Fixing means), 36: peripheral wall portion (fixing means), 38: upper surface (heat insulating member), 74: fixing bolt, 76: gap, 104: press-fitting hole (fixing means), 110: rod-shaped portion (fixing means), 126 : Caulking piece (fixing means)

Claims (8)

In an engine mount in which a first attachment member attached to the power unit side and a second attachment member attached to the vehicle body side are connected by a main rubber elastic body,
Relative to the mounting portion to the power unit side of the first mounting member, the thermal conductivity than the first mounting member has a lower heat insulating member are integrally fixed by fixing means, heat insulating member Is positioned on the side of the power unit of the first mounting member to constitute a mounting surface that is directly overlapped and mounted on the power unit, and the heat insulating member is fixed to the first mounting member. An engine mount characterized in that a non-finished surface is directly bonded to the main rubber elastic body .   The engine mount according to claim 1, wherein the heat insulating member is formed of stainless steel.   The first mounting member has a solid rod shape, and one end in the axial direction of the first mounting member is fixed to the main rubber elastic body in an embedded state. 3. The engine mount according to claim 1, wherein a flange-like portion that protrudes and extends in a direction perpendicular to the axial direction is formed at the other end portion in the axial direction of the mounting member, and the mounting portion is configured by the flange-like portion. .   The first mounting member is formed with a housing recess that opens on the upper surface of the flange-shaped portion, while the heat insulating member is housed in the housing recess, and the outer peripheral edge of the heat insulating member. The heat insulating member is fixed to the flange-shaped portion by the fixing means in a state where the portion is surrounded by the first mounting member and the upper surface of the heat-insulating member protrudes above the upper surface of the flange-shaped portion. The engine mount according to claim 3.   The outer peripheral edge portion of the heat insulating member is formed with a locking portion that protrudes outward, while the peripheral wall portion that defines the housing recess is bent toward the locking portion and fixed by caulking, The engine mount according to claim 4, wherein the fixing means is constituted by the locking portion and the peripheral wall portion fixed by caulking to the locking portion.   The outer peripheral edge portion of the heat insulating member is formed with a locking portion that protrudes outward, and the peripheral wall portion that defines the housing recess surrounds the outer peripheral edge portion of the heat insulating member along the locking portion. The engine mount according to claim 4, wherein the fixing means is constituted by the locking portion and the peripheral wall portion cast around the locking portion.   The peripheral part of the said heat insulation member is press-fitted and fixed with respect to the surrounding wall part which defines the said accommodation recess, The said adhering means is comprised by the press-contact of this heat insulation member and this surrounding wall part. Engine mount.   The engine mount according to claim 3, wherein the heat insulating member is fixed so as to cover the entire upper surface of the flange-like portion.

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