JP5085502B2 - Plastic cylindrical bracket and anti-vibration mount assembly using such plastic cylindrical bracket - Google Patents

Description

  The present invention relates to a resin cylindrical bracket that is assembled to an anti-vibration mount main body and fixes the anti-vibration mount main body to one member to be anti-vibration connected, and an anti-vibration mount assembly using the resin cylindrical bracket. It relates to solids.

  2. Description of the Related Art Conventionally, a fluid-filled vibration-proof mount is known as a type of vibration-proof mount that is interposed between members constituting a vibration transmission system and supports these members in a vibration-proof connection or vibration-proof manner. This fluid-filled vibration-proof mount generally has a structure in which a pressure receiving chamber and an equilibrium chamber each filled with an incompressible fluid are provided, and the pressure receiving chamber and the balance chamber communicate with each other through an orifice passage. A vibration isolation effect is obtained by a resonance action of an incompressible fluid flowing in the orifice passage based on a relative pressure fluctuation generated between the pressure receiving chamber and the equilibrium chamber at the time of vibration input.

  In addition, a fluid-filled vibration-proof mount has been proposed that employs a pneumatic actuator for switching control of vibration-proof characteristics. For example, Patent Document 1 proposes a structure in which a communication state and a cutoff state of an orifice passage are switched by a pneumatic actuator.

  Incidentally, as described in Patent Document 1, in the structure in which the vibration isolation characteristics are switched and controlled by the pneumatic actuator, it is necessary to assemble a pneumatic actuator separately formed on the vibration isolation mount body. Therefore, as described in Patent Document 1 (Japanese Patent Laid-Open No. 2005-106150), for example, a bracket that is assembled to a vibration-proof mount body and is fixed to one member to be vibration-proof connected. An anti-vibration mount assembly in which an anti-vibration mount body and a pneumatic actuator are assembled in a predetermined relative positional relationship has been proposed.

  Therefore, since the bracket is required to have strength in consideration of the input load to the vibration-proof mount body, conventionally, a metal bracket has been exclusively employed (see Patent Document 1). However, with the recent demand for higher energy efficiency in automobiles, it has become necessary to reduce the weight of the bracket. It should be noted that simply making the bracket made of synthetic resin has been impossible to achieve because the material strength of the metal and the synthetic resin is significantly different.

JP-A-2005-106150

  Here, the present invention has been made in the background as described above, and the problem to be solved is a resin cylindrical shape having a novel structure capable of ensuring sufficient load bearing strength. An object of the present invention is to provide an anti-vibration mount assembly using a bracket and such a plastic cylindrical bracket.

  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.

The present invention has a cylindrical portion into which a vibration-proof mount body is fitted and assembled, and a bottom wall portion is provided at one axial opening portion of the cylindrical portion, and the inside of the bottom wall portion The output member is opposed to the center, and the output member is urged away from the bottom wall portion by the urging force of the urging means, and the outer peripheral portion of the output member is annular with respect to the outer peripheral portion of the bottom wall portion. A working air chamber is formed between opposed surfaces of the bottom wall, the output member, and the rubber elastic wall, which are connected by a rubber elastic wall, and the output member is controlled by controlling the negative pressure action on the working air chamber from the outside. In a plastic cylinder bracket configured with a pneumatic actuator that is driven and displaced against the urging force of the urging means, the bottom wall part is integrally formed with the cylindrical part by integral molding of synthetic resin material The bottom wall is cylindrical A circular recess that opens inward is formed, while an annular fitting is fixed to the outer peripheral edge of the rubber elastic wall that is fixed to the outer peripheral edge of the output member and spreads to the outer peripheral side, A working air chamber is formed by fitting and fixing the fitting to the inner peripheral surface of the opening of the circular recess , and the bottom wall portion opens into the cylindrical portion to form a circular recess. It is configured to include a shallow bottomed cylindrical portion and an outer flange-shaped portion that extends outward from the opening peripheral edge of the bottomed cylindrical portion, and from the outer peripheral edge of the outer flange-shaped portion to the cylindrical portion Is continuously extended in the axial direction, and a fixed portion attached to one member to be vibration-proof connected in the vibration-proof mount body protrudes from the outer flange-like portion in a position overlapping with the axial direction. It is characterized by being.

  In such a resin-made cylindrical bracket structured according to the present invention, it is possible to improve the bracket strength by using the housing of the pneumatic actuator. As a result, a bracket made of synthetic resin can be provided with realizable strength.

  That is, in the present invention, the bottom wall portion constituting the housing of the pneumatic actuator is spread in the direction perpendicular to the axial direction of the cylindrical portion, and closes one axial opening of the cylindrical portion, Therefore, the deformation of the cylindrical portion is prevented and a very effective reinforcing effect can be achieved. In particular, the other opening portion of the cylindrical portion exhibits a reinforcing effect based on the deformation restraining effect by the vibration-proof mount body fitted therein, so that a further reinforcing effect can be obtained.

  In addition, for example, if the housing of the pneumatic actuator is only partially fixed, stress concentrates on the fixed portion, making it difficult to realize a resin bracket. However, in the present invention, the housing of the pneumatic actuator is formed integrally with the cylindrical portion so as to cover one axial opening of the cylindrical portion over the entire circumference. As a result, the stress is dispersed all around and the strength is dramatically increased. As a result, the plasticization of the bracket could be realized while ensuring sufficient bracket strength and rigidity.

  In addition, the impact at the time of the suction operation of the pneumatic actuator is dispersed throughout the bracket because the entire bracket is made of resin. Further, such a hitting impact is also reduced by the elasticity and damping effect of the synthetic resin material. As a result, it is possible to suppress abnormal noise and impact associated with the impact at the time of suction operation.

Further, in the present invention, the bottom wall portion opens outwardly from the opening peripheral portion of the bottomed cylindrical portion and the shallow bottomed cylindrical portion that opens into the cylindrical portion to form a circular recess. and a outer flange portion is composed, Ru Tei is adopted a mode that extends out in the axial direction the tubular portion from the outer peripheral edge of the outer flange portion continuously. In such an embodiment, a further reinforcing effect can be exhibited.
Furthermore, in the present invention, an aspect is adopted in which a fixed portion attached to one member to be vibration-proof connected in the vibration-proof mount main body is protruded at a position overlapping with the outer flange-shaped portion in the axial direction. Has been. In such an aspect, for example, a fixed portion to which a relatively large external force such as a support load of the power unit acts intensively is provided at one end portion in the axial direction where the reinforcing effect by the integral formation of the cylindrical portion and the bottom wall portion is exhibited Since it is provided, the reliability with respect to the bracket strength can be further improved.

Further, in the present invention, an annular member is provided which is overlapped and fixed to the outer flange portion of the bottomed cylindrical portion in the cylindrical portion, and the annular member abuts on the axial end surface of the fitting. Thus, a mode in which the fitting fitting is prevented from coming out of the bottomed cylindrical portion is preferably employed. In such an aspect, it is possible to effectively secure the fixing space of the annular member. The annular member is preferably made of a synthetic resin or a metal member. If an annular member made of synthetic resin is used, a fixing structure such as welding can be arbitrarily employed in addition to fixing by screws, caulking, adhesion, or the like.

  Moreover, in this invention, the reinforcement rib which straddles between a cylindrical part and a bottom wall part may be formed. Thereby, the further reinforcement effect can be acquired.

  Further, in the present invention, a stopper support portion that extends outward in the direction perpendicular to the axis is integrally formed at the opening-side end portion of the cylindrical portion, and protrudes outward in the axial direction from the opening portion of the cylindrical portion. A mode in which the rebound stopper member extending across the frame is attached to the stopper support portion is suitably employed. In such an aspect, for example, a support portion on which a relatively large external force such as a stopper load acts intensively is provided at the other end portion in the axial direction where the reinforcement effect by the fitting of the vibration-proof mount body is exhibited. Therefore, the reliability with respect to the bracket strength can be further improved.

  Furthermore, in the present invention, the first mounting member is spaced apart from one opening side of the cylindrical second mounting member, and the first mounting member and the second mounting member are connected by the main rubber elastic body. The other opening of the second mounting member is closed with a flexible membrane, while a partition member is disposed between the opposing surfaces of the main rubber elastic body and the flexible membrane, By supporting it, a pressure receiving chamber into which vibration is input is formed on one side of the partition member with a body rubber elastic body on one side, and a flexible membrane is formed on the other side. An orifice that forms an equilibrium chamber in which a part of the wall portion is configured to allow volume change, encloses an incompressible fluid in the pressure receiving chamber and the equilibrium chamber, and communicates the pressure receiving chamber and the equilibrium chamber with each other. Employs an anti-vibration mount body with a passage and extends outward in the direction perpendicular to the axis at the opening end of the cylindrical part. The second mounting member of the vibration-proof mount main body is fitted and fixed to the cylindrical portion of the resin cylindrical bracket having a structure in which the stopper support portion is integrally formed, and the orifice passage is opened to the equilibrium chamber side. An output member of a pneumatic actuator provided on a plastic cylindrical bracket is placed opposite to the part with a flexible film interposed therebetween, and the orifice passage is switched between a communication state and a blocking state by driving and displacing the output member. In addition, the anti-vibration mount assembly in which the rebound stopper member for restricting the amount of displacement of the first mounting member in the separation direction from the second mounting member is assembled to the resin cylindrical bracket is also characterized in that To do.

  In such an anti-vibration mount assembly constructed according to the present invention, since the strength of the bracket of the resin cylindrical bracket to which the anti-vibration mount body is assembled is sufficiently secured, the anti-vibration mount assembly The sufficient load bearing strength can be ensured.

  In addition, since the entire bracket is made of resin and the bracket is reduced in weight, the vibration-proof mount assembly can be reduced in weight.

  Hereinafter, in order to clarify the present invention more specifically, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 shows an anti-vibration mount assembly 10 as an embodiment of the present invention in a state where it is mounted on an automobile. This anti-vibration mount assembly 10 includes an anti-vibration mount in which a first attachment fitting 12 as a first attachment member and a second attachment fitting 14 as a second attachment member are elastically connected by a main rubber elastic body 16. A mounting body 18 as a main body and a cylindrical bracket 20 as a resin-made cylindrical bracket are included, and the first mounting bracket 12 is mounted on a mounting bracket 22 on the power unit side, while the second mounting bracket. 14 is fitted in the cylindrical bracket 20 and is attached to the vehicle body 23 as one member to be vibration-proof connected via the cylindrical bracket 20, so that the power unit is supported in a vibration-proof manner with respect to the vehicle body 23. It has become so.

  In the following description, the vertical direction means the vertical direction in FIG. 1 which is the main vibration input direction in principle. In FIG. 1, the left cross section and the right cross section across the center line show different cross sections with a 90 ° depression angle in the circumferential direction around the center line.

  More specifically, the first mounting member 12 is made of a metal material such as iron or aluminum alloy, and has a substantially inverted truncated cone block shape. A mounting bolt 24 that protrudes upward in the axial direction is integrally formed on the large-diameter side end surface of the first mounting bracket 12.

  On the other hand, the second mounting bracket 14 is made of a metal material similar to that of the first mounting bracket 12 and has a large-diameter, generally cylindrical shape as a whole. Accordingly, in the present embodiment, an inclined portion 26 that gradually decreases in diameter as it goes downward in the axial direction is formed in the axially intermediate portion of the second mounting bracket 14. Accordingly, the axially upper side of the inclined part 26 is a large diameter part 28, while the axially lower side of the inclined part 26 is a small diameter part 30. Moreover, the opening edge part by the side of the small diameter part 30 is used as the crimping part bent in the radial direction inner side.

  In addition, a constricted portion 32 that is recessed inward in the radial direction and extends in a substantially constant cross-sectional shape over the entire circumference is formed at the upper end portion in the axial direction of the second mounting member 14. Furthermore, a flange-like portion 34 that extends outward in the radial direction is formed integrally with the second mounting member 14 at the opening side edge of the constricted portion 32.

  Therefore, a pair of fixed pieces 36 and 36 that extend further outward in the radial direction are integrally formed in the flange-like portion 34 at portions facing each other in one radial direction. Further, the flange-like portion 34 is integrally formed with one contact piece 38 that protrudes to the outer peripheral side at one place on the circumference. A buffer rubber 40 is formed on the upper surface of the contact piece 38. Thereby, the mounting bracket 22 on the power unit side to which the first mounting bracket 12 is mounted is brought into contact, and the relative displacement amount in the approach direction between the first mounting bracket 12 and the second mounting bracket 14 is buffered. A bound stopper mechanism for limiting to the above is configured. In addition, the buffer rubber 40 of the present embodiment is integrally formed with a main rubber elastic body 16 described later.

  The first mounting member 12 is disposed on substantially the same central axis line, spaced apart from the opening side on the upper side in the axial direction of the second mounting member 14 having such a structure. A main rubber elastic body 16 is disposed between the first mounting bracket 12 and the second mounting bracket 14, and the first mounting bracket 12 and the second mounting bracket are arranged by the main rubber elastic body 16. 14 are elastically connected.

  The main rubber elastic body 16 has a truncated cone shape as a whole, and the first mounting bracket 12 is vulcanized and bonded so as to be inserted from the end surface on the small diameter side, and on the outer peripheral surface of the large diameter side end portion. In the second mounting bracket 14 including the constricted portion 32, the opening portion on the upper side in the axial direction is overlapped and vulcanized and bonded. That is, the main rubber elastic body 16 is formed as an integrally vulcanized molded product including the first mounting bracket 12 and the second mounting bracket 14, and the upper side of the second mounting bracket 14 by the main rubber elastic body 16. The opening is covered fluid-tightly. A mortar-shaped large-diameter recess 42 is formed on the large-diameter side end surface of the main rubber elastic body 16 and is opened in the second mounting bracket 14.

  Furthermore, a seal rubber layer 44 formed integrally with the main rubber elastic body 16 is formed on the second mounting bracket 14 so as to cover substantially the entire inner peripheral surface of the large diameter portion 28 and the inclined portion 26. ing. A stepped surface 46 extending in the direction perpendicular to the axis is formed at the boundary between the seal rubber layer 44 and the main rubber elastic body 16.

  A fitting rubber 48 is attached to the outer peripheral surface of the second mounting bracket 14 so as to cover from the upper end in the axial direction to the lower end of the large diameter portion 28. In this case, the fitting rubber 48 has a pressing portion 50 whose lower portion is fixed to the outer peripheral surface of the large-diameter portion 28 of the second mounting bracket 14, and its upper portion is the outer peripheral side of the constricted portion 32. The thick adhering portion 52 is filled in the concave groove-shaped portion formed in the inner wall. In particular, in this embodiment, the outer diameter dimension of the press contact part 50 is larger than the outer diameter dimension of the fixing part 52, and an annular annular step surface is formed at the boundary between the press contact part 50 and the fixing part 52. .

  In the present embodiment, the fitting rubber 48 is integrally formed with the main rubber elastic body 16 through a through hole (not shown) penetrating the flange-like portion 34, the constricted portion 32, etc. of the second mounting bracket 14. Has been. Although not necessarily clear in the figure, the press-contact portion 50 of the fitting rubber 48 in the present embodiment is formed with a plurality of groove-shaped portions that open to the outer peripheral surface and extend linearly in the axial direction. In addition, the outer peripheral surface of the press contact part 50 is formed in an uneven shape in the circumferential direction. An annular seal lip that extends in the circumferential direction in the shape of a small protrusion may be integrally formed on the outer peripheral surface of the fitting rubber 48.

  Further, a partition member 54 and a diaphragm 56 as a flexible film are sequentially inserted into the second mounting bracket 14 from the opening portion in the axial direction and are fixedly fitted to the second mounting bracket 14. ing. The partition member 54 has a structure in which upper and lower partition plates 58 and 60 each having a substantially disc shape formed of a hard material such as a metal material or a synthetic resin material are overlapped with each other in the axial direction. The diaphragm 56 is formed of a thin rubber film, has a substantially thin disk shape with rippled slack, and a cylindrical support fitting 62 is vulcanized and bonded to the outer peripheral edge thereof. ing.

  Then, the partition member 54 and the diaphragm 56 are sequentially inserted in the axial direction with respect to the second mounting bracket 14, and then the second mounting bracket 14 is subjected to diameter reduction processing such as eight-way drawing. The outer peripheral surfaces of the partition member 54 and the support bracket 62 are fitted and fixed to the second mounting bracket 14, and the partition member 54 and the support bracket 62 are supported by the second mounting bracket 14. Thereby, the partition member 54 is arranged between the opposing surfaces of the main rubber elastic body 16 and the diaphragm 56. Note that the lower opening of the second mounting bracket 14 is caulked and locked to the lower end of the support bracket 62.

  Further, under such an assembled state, the partition member 54 and the support fitting 62 are overlapped with each other in the axial direction between the stepped surface 46 of the main rubber elastic body 16 and the lower end crimped portion of the second attachment fitting 14. , Is positioned in the axial direction. A seal rubber 64 that is integrally formed with the diaphragm 56 and is attached to the outer peripheral surface of the support fitting 62 is sandwiched between the support fitting 62 and the second attachment fitting 14. As a result, the lower opening of the second mounting member 14 is fluid-tightly closed. A seal rubber layer 44 is sandwiched between the partition member 54 and the second mounting bracket 14. As a result, a pressure receiving chamber 66 is formed on the upper side in the axial direction of the partition member 54. A part of the wall portion is formed of the main rubber elastic body 16, and a pressure change is caused when vibration is input. On the other hand, on the lower side in the axial direction of the partition member 54, a part of the wall portion is constituted by a diaphragm 56, and an equilibrium chamber 68 in which volume change is allowed is formed. The pressure receiving chamber 66 and the equilibration chamber 68 are fluid-tightly partitioned with respect to the external space, and incompressible fluids such as water, alkylene glycol, polyalkylene glycol, and silicone oil are sealed therein, respectively. The fluid is sealed in the pressure receiving chamber 66 and the equilibrium chamber 68 by drawing the partition member 54 and the diaphragm 56 into the second mounting bracket 14 in an incompressible fluid and drawing the second mounting bracket 14. It can be advantageously made by applying.

  In addition, the upper partition plate 58 constituting the partition member 54 is formed with a circumferential groove 70 having an outer peripheral edge portion extending in a substantially constant cross-sectional shape so as to open to the outer peripheral surface and to have a predetermined length in the circumferential direction. On the other hand, the lower partition plate 60 has an outer peripheral groove 72 extending in the outer peripheral edge portion with a substantially constant cross-sectional shape, and is formed in a predetermined length in the circumferential direction by opening the outer peripheral surface and the axial upper surface. An inner circumferential groove 74 extending in the middle portion in the direction with a substantially constant cross-sectional shape is formed at a predetermined length in the circumferential direction by opening in the axial upper surface. Furthermore, a circular recess 76 that opens downward is formed in the central portion of the lower partition plate 60.

  The upper and lower partition plates 58 and 60 are overlapped in the axial direction, and the second mounting bracket 14 is fitted and fixed to each outer peripheral surface, so that the peripheral groove 70 and the outer peripheral groove 72 are covered. The partition member 54 is formed with upper and lower two-stage outer flow paths 78 and 80 each extending a predetermined length in the circumferential direction at the outer peripheral edge. In addition, these outer flow paths 78 and 80 are connected in series at a connection hole 82 formed in the upper partition plate 58 at one end, and the other end is connected to the upper and lower partition plates 58 and 60. The pressure receiving chamber 66 and the equilibrium chamber 68 are communicated with each other through the formed communication holes 84 and 86. As a result, a first orifice passage 88 is formed in the outer peripheral portion of the partition member 54 so as to extend in the circumferential direction by a length of one or more rounds and allow fluid flow between the pressure receiving chamber 66 and the equilibrium chamber 68. Yes.

  Further, since the inner peripheral groove 74 of the lower partition plate 60 is covered with the upper partition plate 58, an inner flow path 90 that extends in the radial intermediate portion by a predetermined length is formed inside the partition member 54. ing. One end portion of the inner flow path 90 is opened and communicated with the pressure receiving chamber 66 through a communication hole 92 formed in the upper partition plate 58, and the other end portion is formed in the lower partition plate 60. Through the communicating hole 94, the recess 76 opens to the equilibrium chamber 68 and communicates therewith. As a result, a second orifice passage 96 is formed in the radially intermediate portion of the partition member 54 so as to extend in the circumferential direction by a length of not more than one round and permit fluid flow between the pressure receiving chamber 66 and the equilibrium chamber 68. Has been.

  In the present embodiment, the first orifice passage 88 is tuned to a low frequency range of about 10 Hz so as to exhibit an effective vibration-proofing effect against engine shake, while the second orifice passage 96 is provided. Is tuned to a high frequency range of about 20 to 40 Hz so as to exhibit an effective anti-vibration effect against idling vibration.

  As shown in FIG. 1, the mount body 18 having such a structure is fixedly assembled to the cylindrical bracket 20. The cylindrical bracket 20 is formed of a hard synthetic resin material such as a fiber reinforced resin, and includes a cylindrical portion 98 having a substantially cylindrical shape into which the mount body 18 is fitted.

  Further, a bottom wall portion 100 extending in a direction perpendicular to the axis is integrally formed at the lower end portion in the axial direction of the cylindrical portion 98. Thereby, the opening part of the axial direction lower side of the cylindrical part 98 is covered by the bottom wall part 100. FIG.

  The bottom wall portion 100 has a structure in which an outer flange-like portion 104 is integrally formed at the opening peripheral edge portion of the shallow bottomed cylindrical portion 102. The bottomed cylindrical portion 102 has a structure in which an axial lower end opening of a cylindrical wall extending in a straight direction in the axial direction with a substantially constant inner and outer diameter dimension is covered with a bottom wall. In other words, the bottomed cylindrical portion 102 includes a circular recess 106 that extends in the axial direction with an approximately constant circular cross section and opens upward. Further, a central protrusion 108 having a substantially inverted cup shape is integrally formed at the central portion of the bottom wall of the bottomed cylindrical portion 102. Further, a port 110 extending downward is integrally formed on the upper bottom wall of the central protrusion 108. On the other hand, the outer flange-like portion 104 has an annular plate shape, and spreads outward in the radial direction from the opening peripheral edge portion of the bottomed cylindrical portion 102.

  The outer peripheral edge portion of the outer flange-like portion 104 of the bottom wall portion 100 is connected to the lower end edge in the axial direction of the tubular portion 98, and the circular recess 106 opens into the tubular portion 98. That is, the cylindrical portion 98 extends axially upward from the outer peripheral edge portion of the outer flange-shaped portion 104.

  An attachment leg 112 as a fixed part is integrally formed at the lower end of the tubular part 98. The mounting leg portion 112 has a plate shape that spreads outward in the direction perpendicular to the axis of the tubular portion 98. The mounting legs 112 may be formed in an annular plate shape over the entire circumference, or may be formed in a plurality spaced apart on the circumference, but in this embodiment, the diameter of the cylindrical portion 98 is A pair of mounting leg portions 112 and 112 are formed facing each other in one direction. Further, in the present embodiment, the mounting leg portion 112 is formed at a position overlapping the outer flange-like portion 104 in the axial direction of the tubular portion 98. In short, the outer flange-shaped portion 104 is formed so as to spread in the same plane as the mounting leg portion 112 at a position where the mounting leg portion 112 extends inward in the direction perpendicular to the axis of the cylindrical portion 98. In the present embodiment, the thickness of the outer flange-shaped portion 104 is thinner than that of the mounting leg 112, and the axial outer surface of the outer flange-shaped portion 104 is the axial outer surface of the mounting leg 112 and The cylindrical portion 98 extends on the same plane as the lower end surface in the axial direction.

  In addition, a flange-like portion that extends radially outward is integrally formed at the upper end edge of the tubular portion 98, and the flange-like portions constitute fixed support pieces 114, 114 as a pair of stopper support portions. Has been. The pair of fixed support pieces 114 and 114 are protruded in the opposing direction of the pair of mounting legs 112 and 112. A fixing bolt 116 is planted on the fixed support piece 114. Furthermore, a contact support piece 118 protruding in a direction substantially orthogonal to the opposing direction of the pair of fixed support pieces 114 and 114 is integrally formed on the tubular part 98 by the flange-like part. Furthermore, reinforcing ribs 119 for reinforcing the fixed support pieces 114 and 114 and the contact support piece 118 are integrally formed on the outer peripheral surface of the cylindrical bracket 20. The reinforcing rib 119 has a substantially triangular side surface shape that connects a substantially straight end portion of the flange-shaped portion from an axially intermediate portion of the tubular portion 98, and a plurality of ribs 119 on the circumference of the tubular portion 98. In the place, it is set as the plate-shaped body which has predetermined thickness in the circumferential direction of the cylindrical part 98. As shown in FIG.

  The mount main body 18 is assembled to such a cylindrical bracket 20. The mount main body 18 is fitted from the upper opening of the cylindrical portion 98 in the cylindrical bracket 20, and the second mounting bracket 14 has a cylindrical shape of the cylindrical bracket 20 over substantially the entire area except for the flange-shaped portion 34. It is incorporated in a state of being accommodated in the shape portion 98.

  Under such an assembled state, the flange-shaped portion 34 of the second mounting bracket 14 is superimposed on the upper end surface in the axial direction of the cylindrical bracket 20. Further, a pair of fixed pieces 36, projecting from the second mounting bracket 14 with respect to the pair of fixed support pieces 114, 114 and the contact support piece 118 provided at the upper opening edge of the cylindrical portion 98, 36 and the abutting piece 38 are overlapped and supported from below.

  The mount body 18 and the cylindrical bracket 20 are fixed to the fixing support pieces 114 and 114 with respect to the bolt insertion holes 120 and 120 formed in the fixing pieces 36 and 36 of the second mounting bracket 14. The bolts 116 and 116 are inserted to be positioned in the radial direction. Therefore, in the present embodiment, the second mounting bracket 14 is fixed to the cylindrical bracket 20 by fixing the rebound stopper bracket 144 as described later.

  Further, the fitting rubber 48 is interposed between the second mounting bracket 14 and the cylindrical bracket 20 with the mount body 18 being fitted into the cylindrical bracket 20 as described above. Therefore, problems such as relative displacement of the mount body 18 and the cylindrical bracket 20 in the twisting direction and the radial direction can be effectively prevented, and securing of the pull-out resistance due to the frictional resistance of the fitting rubber 48 can be advantageously realized. I can do it.

  Further, the vibration-proof mount assembly 10 is provided with a pneumatic actuator 122 using the bottom wall portion 100 of the cylindrical bracket 20. The pneumatic actuator 122 includes a rubber elastic wall 124 as an elastic partition wall.

  The rubber elastic wall 124 has an annular plate shape as a whole, and an inner peripheral edge portion thereof is vulcanized and bonded to an opening peripheral edge portion of a press fitting 126 as an output member having a substantially reverse cup shape. The pressing metal fitting 126 is disposed above the bottom wall portion 100 at a central portion of the bottom wall portion 100. A covering rubber 128 formed integrally with the rubber elastic wall 124 is attached to the entire surface of the pressing metal 126. Further, the outer peripheral edge of the rubber elastic wall 124 is vulcanized and bonded to a fitting ring 130 as a substantially annular fitting.

  Then, the elastic ring wall 124 is assembled to the bottom wall portion 100 by fitting the fitting ring 130 into the circular recess 106 of the bottom wall portion 100. As a result, a working air chamber 134 separated from the external space is formed between the bottom wall of the bottomed cylindrical portion 102 and the opposed surfaces of the rubber elastic wall 124 and the pressing fitting 126.

In the present embodiment, the fitting ring 130 is pressed over the entire circumference by the resin ring 132 as an annular member in a state where the rubber elastic wall 124 is assembled to the bottom wall portion 100. Resin ring 13 2 is formed of a thermoplastic material and has a ring-shaped plate. Further, in the bottom wall portion 100, the upper end surface of the bottomed cylindrical portion 102 and the upper surface in the axial direction of the outer flange-shaped portion 104 cooperate to form an annular flat surface extending in the direction perpendicular to the axis. With respect to the flat surface of the annular resin ring 13 2 are superimposed, a suitable site on the circumference, is fixed by ultrasonic welding or bonding or the like. Inner diameter of the resin ring 13 2 is smaller than the inner diameter of the fitting ring 130 which is fitted into the circular recess 106. Inner peripheral edge portion of the resin ring 13 2 protruding from the opening radially inward of the circular recess 106 is abutted against the axially upper end surface of the fitting ring 130. This prevents the fitting ring 130 from coming out of the bottomed cylindrical portion 102.

  The fitting ring 130 is a metal fitting that extends over the entire circumference in a substantially L-shaped cross section in which the lower end in the axial direction is bent inward. A seal projection 133 that protrudes toward the bottom wall of the bottomed cylindrical portion 102 of the bottom wall portion 100 is formed integrally with the rubber elastic wall 124 at the inwardly bent portion of the lower end portion. The seal projection 133 protrudes from the fitting ring 130 downward in the axial direction at a substantially constant height, and is formed over the entire circumference. The seal protrusion 133 is held between the axially opposed surfaces of the fitting ring 130 pressed in the axial direction by the resin ring 132 and the bottomed cylindrical portion 102, whereby the rubber elastic wall 124 is retained. The outer peripheral edge of the working air chamber 134 is fluid-tightly assembled to the outer peripheral edge of the bottom wall of the bottomed cylindrical portion 102 to ensure the fluid tightness of the working air chamber 134.

  In addition, a coil spring 136 as an urging means is accommodated and disposed in the central portion of the working air chamber 134 and is disposed between the bottom wall of the bottomed cylindrical portion 102 and the opposing surface of the pressing fitting 126. . In particular, in the present embodiment, the coil spring 136 is positioned and supported by being fitted to the center protrusion 108 and the rubber protrusion 138. The pressing fitting 126 is constantly urged in a direction away from the bottom wall portion 100 in the axial direction by the urging force of the coil spring 136.

In such a pneumatic actuator 122, the upper bottom portion of the press fitting 126 is disposed to face the center of the bottom portion of the partition member 54 with the diaphragm 56 interposed therebetween. In this state, when the working air chamber 134 is connected to the atmosphere, as shown in FIG. 1, the pressing fitting 126 is elastically protruded upward by the biasing force of the coil spring 136. Thus, the diaphragm 56 is pressed against the opening of the recess 76 by the upper bottom portion of the pressing fitting 126, so that the second orifice passage 96 is maintained in a shut-off state. On the other hand, by exerting a negative pressure from the outside to the working air chamber 134 of the pneumatic actuator 122, and the clamping shoe 126 is displaced downward against the biasing force of the coil spring 136 to release the pressing force to the diaphragm 56 Thus, the second orifice passage 96 can be maintained in a communicating state. Note that the amount of displacement of the pressing metal fitting 126 when the pressing metal fitting 126 is pulled down by negative pressure suction is limited by the contact of the buffer stopper rubber 139 with the bottomed cylindrical portion 102 in a buffering manner.

  The anti-vibration mount assembly 10 having the above-described structure has the first mounting bracket 12 attached to the mounting bracket 22 on the power unit side of the automobile via the mounting bolt 24 and the second mounting bracket. The cylindrical bracket 20, and thus the second mounting bracket 14, is fixed by a fixing bolt 142 inserted into a fixing hole 140 formed in the mounting leg portion 112 of the cylindrical bracket 20 that is externally fitted and fixed to 14. It is attached to a vehicle body 23 such as a subframe in an automobile. As a result, the anti-vibration mount assembly 10 is interposed between the power unit and the vehicle body 23 so that the power unit is supported in an anti-vibration manner with respect to the vehicle body 23.

  Note that, under such a state in which the vibration-proof mount assembly 10 is mounted on an automobile, a shared support load of the power unit is exerted between the first mounting bracket 12 and the second mounting bracket 14 in a substantially axial direction. Thus, the main rubber elastic body 16 is elastically deformed by a predetermined amount, and the first mounting bracket 12 and the second mounting bracket 14 in the mount main body 18 are displaced by a predetermined amount in the approaching direction in the axial direction. State. Thereby, in a state where no external force is exerted, the diaphragm 56 is held at a position separated from the lower surface of the partition member 54, but in a state where the atmospheric pressure is exerted on the working air chamber 134, the press fitting 126 is configured to elastically protrude upward based on the urging force of the coil spring 136, and the diaphragm 56 is pressed against the opening of the recess 76 by the upper bottom portion of the press fitting 126. The second orifice passage 96 is maintained in the blocked state.

  Further, the anti-vibration mount assembly 10 mounted on the automobile as described above is mounted with a rebound stopper metal fitting 144 as a rebound stopper member. The rebound stopper metal 144 has leg portions 148 and 148 extending downward from both ends in the extending direction of the top plate portion 146 extending in a substantially horizontal direction, and has a gate shape as a whole. In addition, reinforcing ribs 150 and 150 are integrally formed over the entire length including the top plate portion 146 and both leg portions 148 and 148 at both edges in the width direction of the rebound stopper fitting 144. Further, a bolt escape recess 152 that is recessed upward and opened downward is formed in the central portion of the top plate portion 146. Furthermore, a thick-walled rebound stopper rubber 154 protrudes from the lower surface of the top plate portion 146 so as to surround the bolt escape recess 152.

  Such a rebound stopper metal fitting 144 is assembled from above the cylindrical bracket 20, and is spaced apart upward in the axial direction of the mount main body 18, and is disposed across the mount main body 18 in one radial direction. Further, the mounting plate portions 156 and 156 provided at the lower ends of both the leg portions 148 and 148 of the rebound stopper metal fitting 144 are fixed pieces of the second mounting metal piece 14 with respect to the fixing support pieces 114 and 114 of the cylindrical bracket 20. 36 and 36 are superimposed from above. Then, the fixing bolt 116 planted in the fixing support piece 114 and inserted into the bolt insertion hole 120 of the second mounting bracket 14 is inserted into the bolt insertion hole 158 formed in the mounting plate portion 156, and The plate portion 156 is fastened together with the fixing piece 36 by the fixing bolt 116 and the fixing nut 160 to be fixed to the cylindrical bracket 20.

  In the state where the rebound stopper metal fitting 144 is fixed to the cylindrical bracket 20 as described above, the lower surface of the rebound stopper rubber 154 is predetermined with respect to the mounting bracket 22 on the power unit side as shown in FIG. It is designed to be opposed to each other at a distance. Thereby, when the vibration load in the rebound direction in which the first mounting bracket 12 is separated from the second mounting bracket 14 is input, the mounting bracket 22 hits the rebound stopper bracket 144 via the rebound stopper rubber 154. A rebound stopper mechanism that limits the amount of relative displacement in the rebound direction is configured.

  Further, when the vibration isolating mount assembly 10 is mounted, the air pipe line 162 is connected to the port 110 formed in the bottom wall portion 100 that constitutes the housing of the pneumatic actuator 122. The working air chamber 134 is selectively connected to the atmosphere and a negative pressure source (not shown) through the air line 162. That is, a switching valve (not shown) is disposed on the air pipe line 162 connected to the working air chamber 134, and the switching valve is controlled by a control device (not shown) and switched. As a result, the working air chamber 134 is selectively switched and connected to the atmosphere and the negative pressure source.

  Then, by selectively applying atmospheric pressure and negative pressure to the working air chamber 134 in accordance with the running state of the automobile, the second orifice passage 96 is controlled to communicate / shut off as described above, and the vibration isolation of the mount body 18 is achieved. The characteristics can be switched and changed.

  In the anti-vibration mount assembly 10 having the above-described structure, the cylindrical bracket 20 to which the mount body 18 is assembled is made of a synthetic resin, but the shaft of the cylindrical portion 98 constituting the cylindrical bracket 20 is used. The lower opening in the direction is covered with a bottom wall portion 100 integrally formed with the cylindrical portion 98, and the mount body 18 is fitted and fixed from the upper opening in the axial direction of the cylindrical portion 98. Therefore, both end portions in the axial direction of the tubular portion 98 are reinforced, and a sufficient load resistance strength can be achieved in the tubular bracket 20.

  And in the vibration-proof mount assembly 10 comprised by assembling | attaching the mount main body 18 to such a cylindrical bracket 20, it becomes possible to achieve sufficient weight reduction, and the energy efficiency in a motor vehicle is high. It is possible to respond to improvement requests.

  Further, the bottom wall portion 100 is integrally formed over the entire circumference with respect to the axial lower opening of the tubular portion 98 and covers the axial lower opening of the tubular portion 98. Therefore, as compared with the case where the bottom wall portion 100 is partially formed integrally with the cylindrical portion 98, the stress is distributed over the entire circumference, and the load bearing strength is dramatically increased. It becomes.

  Further, since the entire cylindrical bracket 20 is formed of a synthetic resin material, the impact of the central protrusion 108 during the suction operation of the pneumatic actuator 122 is dispersed throughout the cylindrical bracket 20. Further, such impact impact is also reduced by the elasticity and damping effect of the synthetic resin material forming the cylindrical bracket 20. As a result, it is possible to suppress abnormal noise and impact associated with the impact of the central protrusion 108 during the suction operation of the pneumatic actuator 122.

  Therefore, in the cylindrical bracket 20 employed in the vibration proof mount assembly 10 of the present embodiment, the bottom wall portion 100 has an outer flange-like portion 104 at the opening peripheral edge portion of the bottomed cylindrical portion 102. Since the stepped shape is integrally formed, a further reinforcing effect can be obtained.

  Further, in the cylindrical bracket 20 employed in the vibration proof mount assembly 10 of the present embodiment, since the stepped bottom wall portion 100 is integrally formed with the cylindrical portion 98, the fitting ring 130 is provided. It is possible to advantageously secure a fixing space for the resin ring 132 that prevents the resin ring 132 from coming out of the circular recess 106.

  Furthermore, in the cylindrical bracket 20 employed in the vibration proof mount assembly 10 of the present embodiment, the fixed support pieces 114 and 114 are integrally formed at the upper end portion in the axial direction of the cylindrical portion 98 and the cylindrical shape. Since the mounting legs 112 and 112 are integrally formed at a position that is the lower end portion in the axial direction of the portion 98 and overlaps with the outer flange-shaped portion 104 in the axial direction, the rebound load and the support load of the power unit act intensively. The reinforcing effect is exerted on the portion, and the reliability of the cylindrical bracket 20 with respect to the load bearing strength can be further improved.

  As mentioned above, although one Embodiment of this invention was explained in full detail, this is an illustration to the last, Comprising: This invention is not limited at all by the specific description in this Embodiment.

  For example, as shown in FIG. 2, reinforcing ribs 164 that connect the bottomed cylindrical portion 102 and the cylindrical portion 98 may be provided. Thereby, the further reinforcement effect in the axial direction lower end part of the cylindrical part 98 can be acquired. In order to facilitate understanding, in FIG. 2, members and parts having the same structure as in the above embodiment are denoted by the same reference numerals as in the above embodiment.

  A plurality of such reinforcing ribs 164 are formed at appropriate intervals in the circumferential direction on the outer peripheral surface of the peripheral wall of the bottomed cylindrical portion 102 of the bottom wall portion 100. Each reinforcing rib 164 has a plate shape with an appropriate thickness and spreads in the longitudinal direction of the mount, and its inner peripheral edge is integrated with the outer peripheral surface of the peripheral wall of the bottomed cylindrical portion 102, and FIG. The inner upper edge portion is integrated with the lower end surface of the cylindrical portion 98.

  However, the specific shape of the reinforcing rib 164 is not limited to a substantially rectangular flat plate shape as illustrated, but a substantially triangular flat plate shape is adopted, and one side of the reinforcing rib 164 has an outer periphery of the peripheral wall of the bottomed cylindrical portion 102. It is possible to adopt a mode in which the other side is integrated with the lower end surface of the cylindrical portion 98 while being integrated with the surface. Further, by forming the reinforcing rib 164 up to the mounting leg 112 and integrating it with the lower surface of the mounting leg 112, the reinforcing effect by the reinforcing rib 164 can be exerted on the mounting leg 112. is there.

  In addition, although not listed one by one, the present invention can be carried out in a mode to which various changes, modifications, improvements and the like are added based on the knowledge of those skilled in the art. It goes without saying that all are included in the scope of the present invention without departing from the spirit of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal cross-sectional explanatory view showing a vibration-proof mount assembly as one embodiment of the present invention. The longitudinal cross-sectional explanatory drawing which shows the other aspect of the resin-made cylindrical brackets employable in this invention.

Explanation of symbols

18: Mount body, 20: Cylindrical bracket, 98: Cylindrical part, 100: Bottom wall part, 106: Circular recess, 122: Pneumatic actuator, 124: Rubber elastic wall, 126: Press fitting, 134: Working air Chamber 136: Coil spring

Claims (5)

The anti-vibration mount main body has a cylindrical portion to be fitted and assembled, and a bottom wall portion is provided at one opening portion in the axial direction of the cylindrical portion. The output member is disposed oppositely, and the output member is urged away from the bottom wall portion by the urging force of the urging means, and the outer peripheral portion of the output member is against the outer peripheral portion of the bottom wall portion. A working air chamber is formed between the opposed surfaces of the bottom wall portion, the output member, and the rubber elastic wall by being connected by an annular rubber elastic wall, and negative pressure action on the working air chamber is externally applied. In the resin-made cylindrical bracket in which the pneumatic actuator configured to drive and displace the output member against the biasing force of the biasing means by controlling,
The bottom wall portion is integrally formed with the tubular portion by integral molding of a synthetic resin material, and the bottom wall portion is formed with a circular recess that opens into the tubular portion. An annular fitting is fixed to the outer peripheral edge of the rubber elastic wall that is fixed to the outer peripheral edge of the output member and spreads to the outer peripheral side, and the fitting is connected to the inner periphery of the opening of the circular recess. The working air chamber is formed by being fitted and fixed to a surface ,
The bottom wall portion is a shallow bottomed cylindrical portion that opens into the cylindrical portion to form the circular recess, and an outer flange shape that extends outward from the opening peripheral edge of the bottomed cylindrical portion. And the cylindrical portion continuously extends in the axial direction from the outer peripheral edge of the outer flange-shaped portion, and
A resin cylindrical shape characterized in that a fixed portion attached to one member to be vibration-proof connected in the vibration-proof mount body protrudes at a position overlapping with the outer flange-like portion in the axial direction. bracket. An annular member is provided in the tubular portion so as to overlap and be fixed to the outer flange-like portion of the bottomed cylindrical portion, and the annular member is in contact with an axial end surface of the fitting. a resin cylindrical bracket according to claim 1, exit from the bottomed cylindrical portion of the fitting attachment fitting is prevented. The resin-made cylindrical bracket of Claim 1 or 2 with which the reinforcement rib which straddles between the said cylindrical part and the said bottom wall part is formed. A stopper support portion that extends outward in a direction perpendicular to the axis is integrally formed at the opening-side end portion of the cylindrical portion, and protrudes outward in the axial direction from the opening portion of the cylindrical portion and extends across the opening portion. The resin cylindrical bracket according to any one of claims 1 to 3 , wherein a rebound stopper member is attached to the stopper support portion. The first mounting member is spaced from one opening side of the cylindrical second mounting member, and the first mounting member and the second mounting member are connected by a main rubber elastic body. The other opening of the second mounting member is closed with a flexible membrane, while a partition member is disposed between the opposing surfaces of the main rubber elastic body and the flexible membrane and supported by the second mounting member. As a result, a pressure receiving chamber into which vibration is input is formed on one side of the partition member with a part of the wall made of the main rubber elastic body, and the flexible side is formed on the other side. A part of the wall is formed of a membrane to form an equilibrium chamber in which volume change is allowed, and an incompressible fluid is sealed in the pressure receiving chamber and the equilibrium chamber, and the pressure receiving chamber and the equilibrium chamber communicate with each other. orifice passage employing the vibration damping mount body provided with structures, cylindrical plastic cylindrical bracket according to claim 4, The second mounting member in the anti-vibration mount body is fitted into and fixed to the vibration-proof mount body, and the resin membrane is sandwiched between the opening of the orifice passage toward the equilibrium chamber. An output member of a pneumatic actuator provided on the bracket is disposed oppositely, and the output passage is driven and displaced so that the orifice passage is switched between a communication state and a shut-off state. An anti-vibration mount assembly, wherein a rebound stopper member that regulates a displacement amount in a direction away from the second mounting member is assembled to the resin-made cylindrical bracket.

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