JP2010078052A - Vibration damper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To attain fail-safe by restraining falling-off of a transmission, while restraining the deterioration in durability of a rubber member while restraining generation of an abnormal sound, in a vibration damper functioning as a stopper in three directions. <P>SOLUTION: This vibration damper 1 includes a lower side bracket 3, an upper side bracket 5, support rubber elastic bodies 7 and 7 for connecting both brackets 3 and 5, and first and second stopper rubbers 11 and 13. The lower side bracket 3 is formed in a substantially rectangular cylindrical shape, and is installed on a cross member, and the upper side bracket 5 is installed in a transmission. The first and second stopper rubbers 11 and 13 cover a lower side top wall part surface of the lower side bracket 3 and the inside of respective lower side sidewall parts 3c and 3c. and also have an abutting metal fitting 9 having a lower side abutting part 9a extending in the cylinder axis direction under the first stopper rubber 11, side abutting parts 9b and 9b extending upward at an interval from the first stopper rubber 11 and fastening parts 9c and 9c fastened to the upper side bracket 5. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a vibration isolator, and more particularly, to a vibration isolator that supports a transmission with respect to a vehicle body.

  2. Description of the Related Art Conventionally, a vibration isolator that is attached to a vehicle body frame such as a cross member so as to support a transmission (transmission) and functions as a stopper in a vertical direction, a vehicle front-rear direction, and a vehicle width direction is known. In this way, the vibration isolator that functions as a stopper in three directions has a more complicated structure than the vibration isolator that functions as a stopper in two directions (for example, the vertical direction and the vehicle width direction), and thus the number of manufacturing processes increases. Or the number of welds increases.

  In order to solve such a problem, for example, Patent Document 1 discloses a vibration isolator that functions as a stopper in three directions, in which the number of welded portions after vulcanization molding is reduced. As shown in FIGS. 15 and 16, the vibration isolator 101 is fixed to both ends in the longitudinal direction of the lower surface of the upper plate metal 105 and the upper plate metal 105 which is a rectangular plate made of iron and protrudes downward. A substantially U-shaped engagement fitting 109, a lower plate fitting 103 disposed opposite to the upper plate fitting 105 with a predetermined distance across the engagement fitting 109, and an intermediate position in the longitudinal direction of the lower plate fitting 103. The second engagement fitting 113 that is erected and surrounds the bottom plate 109a of the engagement fitting 109, and is bonded to both end sides of the lower surface of the upper plate fitting 105 and extends toward the lower plate fitting 103. A pair of support rubber elastic bodies 107 and 107 that are fitted and fixed to the respective holding portions 103a and 103a of the plate metal fitting 103 to elastically connect between the upper plate metal fitting 105 and the lower plate metal fitting 103, and a support rubber elastic body 107. , 107 and one piece It is constituted by a rubber elastic body covering portion 111 for covering the surface of the bottom plate 109a of the engaging alloy tool 109 is.

  In this vibration isolator, when a large load is input upward, the horizontal plate portion 113a of the second engagement fitting 113 comes into contact with the bottom plate 109a of the engagement fitting 109, so that the support rubber elastic bodies 107 and 107 are moved upward. Excessive displacement can be suppressed. Further, the movement of the support rubber elastic bodies 107 and 107 in the longitudinal direction and the width direction is surely suppressed by the first locking pieces 115 and 115 and the second locking pieces 117 and 117.

Further, in this vibration isolator, the support rubber elastic bodies 107 and 107 integrally formed with the upper plate metal fitting 105 and the engagement metal fitting 109 by vulcanization molding have respective tip portions of the holding portions 103a of the lower plate metal fitting 103. Since it is fitted and fixed to 103a by press fitting, the number of welded parts after vulcanization molding is reduced.
Japanese Patent No. 4120372

  However, the thing of the said patent document 1 has the following problems. That is, since the lower plate metal fitting 103 and the second engagement metal fitting 113 are attached by welding after assembling the vibration isolator, the work becomes complicated and the supporting rubber elastic bodies 107 and 107 and the rubber elastic body covering are caused by welding heat. The durability of the portion 111 may be deteriorated.

  The support rubber elastic bodies 107 and 107 are fitted and fixed to the holding portions 103a and 103a of the lower plate metal fitting 103 by press fitting. When water is applied to the holding portions 103a and 103a, the lower plate made of metal is used. There is a problem that the metal fitting 103 and the supporting rubber elastic bodies 107 and 107 are rubbed to generate abnormal noise.

  Further, in this vibration isolator, since the distance between the upper metal fitting 105 and the second engagement metal 113 and the distance between the engagement metal 109 and the lower metal fitting 103 are wide, the support rubber elastic bodies 107 and 107 should be If it breaks, the transmission may be greatly inclined and fall off.

  The present invention has been made in view of such points, and the object of the present invention is to improve the durability of a rubber member while suppressing the generation of abnormal noise from the vibration isolator in a vibration isolator that functions as a stopper in three directions. It is intended to provide a technique that achieves fail-safe by suppressing the deterioration of the transmission characteristics and reliably suppressing the dropout of the transmission.

  1st invention is the metal fitting formed in the substantially rectangular cylinder shape, Comprising: The lower side bottom wall part attached to a vehicle body, The lower side top wall part arrange | positioned facing this lower side bottom wall part, and a cylinder A lower mounting having a pair of lower side wall portions connecting the lower bottom wall portion and both ends of the lower top wall portion in a direction perpendicular to the cylinder axis perpendicular to the axial direction and the vertical direction A pair of side wall portions extending downward from both ends of the upper top wall portion in a direction perpendicular to the cylinder axis, the metal fitting, an upper top wall portion disposed opposite to the upper side of the lower top wall portion and attached to the transmission; A pair of upper mounting brackets having a pair of upper side wall portions disposed opposite to each other in the direction perpendicular to the cylinder axis, and a pair of lower mounting brackets formed symmetrically with respect to the lower mounting bracket. A support rubber elastic body integrally connecting the outer surface of the upper mounting bracket and the inner surface of the upper mounting bracket, and the upper top wall portion. A first stopper rubber that covers the surface of the lower top wall portion between the pair of supporting rubber elastic bodies at a predetermined interval in the downward direction, and a cylindrical shaft from the inner surface of each lower side wall portion A pair of second stopper rubbers formed so as to protrude inwardly in a right angle direction, and vertically spaced from the first stopper rubber and at a predetermined interval in a direction perpendicular to the pair of second stopper rubbers and the cylinder axis, A lower abutting portion extending in the cylinder axis direction below the first stopper rubber, and an upper portion spaced from the first stopper rubber and the cylinder axis direction by a predetermined distance from both ends of the lower abutting portion in the cylinder axis direction. A pair of side abutting portions extending from the upper end portion of each side abutting portion to the outer side in the cylinder axial direction, and a pair of fastening portions fastened to the upper top wall portion by a fastener. It is characterized by providing the contact metal fitting.

  According to the first invention, at the time of bumping, the upper top wall portion of the upper mounting bracket abuts on the first stopper rubber covering the surface of the lower top wall portion of the lower mounting bracket, while at the time of rebounding, the abutting bracket. Since the lower abutting portion abuts on the first stopper rubber, an excessive vertical displacement of the support rubber elastic body can be suppressed.

  Further, when a large load is input in the cylinder axis direction, the side contact portion of the contact metal abuts against the first stopper rubber, while when a load in the direction perpendicular to the cylinder axis is input, the lower side of the contact metal Since the abutting portion abuts against a pair of second stopper rubbers formed so as to protrude inward in the direction perpendicular to the cylinder axis from the inner side surface of each lower side wall portion of the lower mounting bracket, the cylindrical shaft of the supporting rubber elastic body Excessive displacement in the direction and the direction perpendicular to the cylinder axis can be suppressed.

  Further, since the pair of supporting rubber elastic bodies integrally connect the lower mounting bracket and the upper mounting bracket, noise is generated when the lower and upper mounting brackets and the supporting rubber elastic body are rubbed. Can be suppressed.

  In addition, since the abutment metal fitting is attached to the upper attachment metal fitting by fastening the fastening portion to the upper attachment metal fitting with the fastener, the support rubber elastic body and the first and second stopper rubbers are attached to the upper and lower attachment metal fittings. These rubber members can be prevented from deteriorating due to welding heat.

  Furthermore, since the upper mounting bracket and the abutment bracket are provided so as to surround the first stopper rubber formed on the lower mounting bracket with a predetermined interval, even if the support rubber elastic body breaks by any chance, It is possible to suppress the transmission from being largely inclined and falling off.

  Therefore, in the vibration isolator that functions as a stopper in three directions, it is possible to suppress the deterioration of the durability of the rubber member while suppressing the generation of abnormal noise from the vibration isolator, and to reliably prevent the transmission from falling off and to provide a fail safe. Can reach.

  According to a second invention, in the first invention, the lower top wall portion is formed with a pair of cutout portions cut out at both ends in the cylinder axis direction. The surface of the lower top wall main body between the notches is covered, and the thickness in the cylinder axis direction is set smaller than the notch depth of the notches It is.

  According to the second invention, the lower top wall portion of the lower mounting bracket is formed with a pair of notches cut out at both ends in the cylinder axis direction, and the lower side between the pair of notches Since the thickness of the first stopper rubber covering the surface of the top wall main body is set to be smaller than the notch depth of the notch portion, the first stopper rubber and the cylinder axis direction are arranged. The distance between the pair of side contact portions that are separated by a predetermined distance can be reduced. Thereby, a contact metal fitting can be made compact and a vibration isolator can be reduced in size.

  According to a third invention, in the first or second invention, the lower and upper mounting brackets are attached to the vehicle body and the transmission, respectively, such that the cylinder axis direction substantially coincides with the vehicle width direction. It is what.

  According to the third invention, for example, when the vehicle suddenly starts or stops, even when a large load is input in the vehicle longitudinal direction due to the inertial force of the transmission, the relative vibration between the transmission and the vehicle body is supported by the elastic rubber body. And the lower contact portion of the contact fitting abuts against the second stopper rubber, so that excessive displacement of the support rubber elastic body in the vehicle longitudinal direction can be suppressed.

  According to a fourth aspect of the present invention, in any one of the first to third aspects, the contact fitting is fastened together with the upper mounting fitting together with the lower end portion of the transmission together with the fastener. Is.

  According to the fourth aspect of the invention, the abutment metal fitting is fastened together with the upper mounting bracket to the lower end portion of the transmission by the fastener, so that the rubber member is hardly affected by the welding heat by, for example, spot welding. Temporary assembly is possible, and it is not necessary to separately provide a fastening member for fastening to the transmission, so the number of parts of the vibration isolator can be reduced.

  According to a fifth invention, in any one of the first to third inventions, the invention further includes a bracket member having a standing wall portion and a bottom wall portion attached to a rear end portion of the transmission. The abutment fitting is fastened together with the upper mounting bracket to the bottom wall portion of the bracket member by the fastener.

  According to the fifth aspect, since the length of the transmission is short, the vibration isolator is attached to the rear end portion of the transmission via the bracket member even when the rear end does not reach the mounting portion on the vehicle body side. Can do.

  Further, since the vibration isolator is attached to the vehicle body while being fastened to the bottom wall portion of the bracket member, there is no need for welding after vulcanization molding, so that the deterioration of the rubber member can be further suppressed. it can.

  According to the present invention, since the pair of supporting rubber elastic bodies integrally connect the lower mounting bracket and the upper mounting bracket, it is possible to suppress the generation of abnormal noise, and the abutment bracket is provided by the fastener. Since it is fastened to the upper mounting bracket, the deterioration of the rubber member due to welding heat can be suppressed, and the upper mounting bracket and the contact bracket surround the lower top wall portion of the lower mounting bracket with a predetermined interval. Therefore, even if the supporting rubber elastic body breaks, it is possible to prevent the transmission from being largely inclined and falling off.

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

(Embodiment 1)
-Configuration of anti-vibration device-
FIG. 1 is a perspective view showing a vibration isolator according to the present invention, FIG. 2 is a front view, FIG. 3 is a cross-sectional view, and FIG. 4 is a top view. The vibration isolator 1 is used for a connection portion between a transmission (transmission) 25 and a vehicle cross member (vehicle body) 27 (see FIG. 13), and mitigates transmission of vibration of the transmission 25 to the cross member 27. Further, the weight of the transmission 25 is supported while restricting the displacement of the transmission 25 due to the torque reaction force or the input load from the road surface.

  The vibration isolator 1 includes a lower mounting bracket 3, an upper mounting bracket 5, a pair of support rubber elastic bodies (insulators) 7 and 7 integrally connecting the mounting brackets 3 and 5, a first A stopper rubber 11, a pair of second stopper rubbers 13 and 13, and an abutment metal fitting 9 that is fastened to the upper mounting metal fitting 5 and surrounds the first stopper rubber 11 from below.

  The lower mounting bracket 3 is formed by bending a substantially rectangular steel plate into a substantially rectangular cylindrical shape. As shown in FIG. 5, a lower bottom wall portion 3a attached to the cross member 27, A lower top wall portion 3b disposed opposite to the side bottom wall portion 3a, and a pair of lower side wall portions 3c and 3c connecting the lower bottom wall portion 3a and the lower top wall portion 3b. is doing.

  Two bolt insertion holes 3e, 3e extending in the vertical direction are formed in the lower bottom wall portion 3a in a row in the cylinder axis direction, and caulking bolts 15, 15 are inserted into the bolt insertion holes 3e, 3e. Has been. The caulking bolts 15 and 15 are attached to the lower bottom wall portion 3a by caulking the hole wall portions of the bolt insertion holes 3e and 3e. The lower mounting bracket 3 attaches the caulking bolts 15 and 15 to the cross member of the vehicle. By fastening to 27, it is fixed to the vehicle body.

  The lower side wall portions 3c, 3c extend upward from both ends of the lower bottom wall portion 3a in the direction perpendicular to the cylinder axis (the direction perpendicular to the cylinder axis direction and the vertical direction). 3c is formed with through holes 3f and 3f penetrating in the direction perpendicular to the cylinder axis at the center of the cylinder axis and at a height of about 2/3 from the lower end. The through holes 3f and 3f are rubbers injected into a molding die (not shown) when the second stopper rubbers 13 and 13 are vulcanized and molded on the inner side surfaces of the lower side wall portions 3c and 3c. Is introduced from the outer side of the lower mounting bracket 3 (cavity for molding the support rubber elastic bodies 7, 7) to the inner side (cavity for molding the second stopper rubbers 13, 13). .

  As shown in FIG. 6, the lower top wall portion 3b extends from the upper ends of the lower side wall portions 3c and 3c to the inside in the direction perpendicular to the cylinder axis, and then welds the tips of the steel plates formed into an elongated shape. It is formed by connecting with. In other words, a pair of cutout portions 3g and 3g are formed in the center of the lower top wall portion 3b so as to cut out both ends in the cylinder axis direction, and a portion between the pair of cutout portions 3g and 3g is formed. An elongated top wall main body 3h is configured. For this reason, the lower top wall portion 3b has an H shape in plan view.

  The upper mounting bracket 5 is formed by bending a substantially rectangular steel plate into a substantially U-shaped cross section, and includes an upper top wall portion 5a attached to the transmission 25 and both ends of the upper top wall portion 5a in the direction perpendicular to the cylinder axis. And a pair of upper side wall portions 5b, 5b extending downward from the respective portions.

  The upper top wall portion 5a is disposed so as to face the lower top wall portion 3b of the lower mounting bracket 3 and is formed in a substantially rectangular plate shape. The upper top wall portion 5a is more cylindrical than the lower top wall portion 3b. It extends outward in the axial direction and outward in the direction perpendicular to the cylinder axis. The upper top wall portion 5a is bent so that the central portion 5c protrudes upward from both end portions 5d and 5d in the direction perpendicular to the cylinder axis and has a substantially hat-like cross section when viewed from the cylinder axis direction. Further, the center portion 5c protruding upward is formed with bolt insertion holes 5f and 5f extending in the vertical direction at both ends in the tube axis direction, whereas the tube shaft shaft protrudes downward from the center portion in the tube axis direction. A protruding strip portion 5e extending in the perpendicular direction is formed.

  As will be described later, the vibration isolator 1 is attached to the transmission 25 with bolts 19 and 19 (see FIG. 13) inserted through the bolt insertion holes 5f and 5f, so that the upper top wall 5a is sufficiently supported. Although the strength is required, the upper top wall portion 5a is bent in two directions, the cylinder axis direction and the cylinder axis perpendicular direction as described above, so that its rigidity is enhanced and sufficient support strength is provided. is doing. Further, the upper top wall portion 5a is formed with a projecting ridge portion 5e protruding downward, so that when a large downward load is input to the vibration isolator 1 from the transmission 25, the upper top wall portion 5a. Will abut on the first stopper rubber 11 covering the top wall body 3h.

  The pair of upper side wall portions 5b, 5b respectively extend from both ends of the upper top wall portion 5a in the direction perpendicular to the cylinder axis to substantially the center in the vertical direction of the lower mounting bracket 3, and the pair of lower side wall portions 3c, The cylinder 3c is arranged opposite to the outside in the direction perpendicular to the cylinder axis. As shown in FIG. 7, bulging portions 5g and 5g that bulge inward are formed at the center portion in the cylinder axis direction of the upper side wall portions 5b and 5b, respectively. Thus, by forming the bulging parts 5g, 5g, the rigidity of the upper side wall parts 5b, 5b is increased, and the supporting rubber elastic bodies 7, 7 connected to the upper side wall parts 5b, 5b. Detachment in the cylinder axis direction is suppressed.

  The upper mounting bracket 5 has the upper top wall portion 5a and the pair of upper side wall portions 5b, 5b so as to have a substantially U-shaped cross section that opens downward, and surrounds the upper half of the lower mounting bracket 3. Are arranged as follows.

  Each of the support rubber elastic bodies 7 and 7 is formed by vulcanization so as to be symmetric with respect to the lower mounting bracket 3, and has an outer surface of the lower mounting bracket 3 and an inner surface of the upper mounting bracket 5. Are connected together. More specifically, each support rubber elastic body 7, 7 is inclined inward as it goes downward, and the lower top wall portion 3b and the lower side wall portions 3c, 3c of the lower mounting bracket 3 are formed. The outer corner portions 3i, 3i formed are connected to the inner corner portions 5h, 5h formed by the upper top wall portion 5a of the upper mounting bracket 5 and the upper side wall portions 5b, 5b. In other words, the support rubber elastic bodies 7 and 7 are vulcanized and bonded to the upper top wall portion 5a of the upper mounting bracket 5 and the upper side wall portions 5b and 5b, and the lower end portions of the support rubber elastic bodies 7 and 7 are lower. The side mounting bracket 3 is vulcanized and bonded to the lower top wall portion 3b and the lower side wall portions 3c and 3c. Each of the supporting rubber elastic bodies 7 and 7 is inclined by approximately 45 degrees, and is mainly configured to reduce and attenuate vibrations in the vertical direction and the direction perpendicular to the cylinder axis.

  As shown in FIG. 8, the first stopper rubber 11 has the lower top wall portion between the pair of supporting rubber elastic bodies 7 and 7 with a predetermined distance in the vertical direction from the upper top wall portion 5 a. The surface of 3b is covered. More specifically, as shown in FIG. 3, the first stopper rubber 11 is formed in a substantially rectangular annular shape so as to cover the upper surface, the lower surface, and the surfaces at both ends in the cylinder axis direction of the top wall main body portion 3 h. The top wall main body 3h extends in the direction perpendicular to the cylinder axis so as to cover the entire length thereof. The thickness of the first stopper rubber 11 in the cylinder axis direction is set to be smaller than the notch depth of the notch 3g of the lower top wall portion 3b of the lower attachment fitting 3, and the lower attachment fitting 3 so that it does not protrude outward in the cylinder axis direction. In addition, the first stopper rubber 11 has chamfered portions where each surface (upper and lower surfaces, both surfaces in the tube axis direction and both surfaces in the tube axis direction) intersects, and a portion above and below the lower top wall portion 3b. Are formed in a trapezoidal cross section when viewed in the cylinder axis direction, and a portion outside the lower axial wall 3b is formed in a trapezoidal cross section when viewed in the direction perpendicular to the cylinder axis.

  Each of the second stopper rubbers 13 and 13 is formed in a substantially rectangular cross section so as to protrude from the inner surface of each of the lower side wall portions 3c and 3c to the inside in the direction perpendicular to the cylinder axis, and each lower side wall portion 3c. , 3c is covered substantially over the entire length in the cylinder axis direction. The inner side surfaces of the second stopper rubbers 13 and 13 are substantially flush with the positions of both ends of the first stopper rubber 11 in the direction perpendicular to the cylinder axis. The second stopper rubbers 13, 13 are connected to the support rubber elastic bodies 7, 7 through through holes 3f, 3f formed in the lower side wall portions 3c, 3c.

  The contact metal fitting 9 is formed by bending a substantially rectangular steel plate into a substantially hat-shaped cross section when viewed from the direction perpendicular to the cylinder axis, and as shown in FIGS. 9 and 10, the lower contact part 9a, A pair of side contact portions 9b, 9b extending upward from both ends of the lower contact portion 9a in the cylinder axial direction, and from the upper ends of the side contact portions 9b, 9b to the outer side in the cylinder axial direction. A pair of fastening portions 9c, 9c is provided.

  The lower contact portion 9a is arranged below the first stopper rubber 11 with a predetermined distance in the vertical direction from the first stopper rubber 11 and in the direction perpendicular to the pair of second stopper rubbers 13, 13. It extends in the cylinder axis direction. More specifically, the lower contact portion 9a has a substantially square shape, is arranged to be spaced apart from the first stopper rubber 11 in the vertical direction, and each of the second stopper rubbers 13, 13 As described above, the first stopper rubber 11 is disposed at a position substantially perpendicular to the short axis of the first stopper rubber 11 formed in a trapezoidal cross section when viewed in the direction of the cylinder axis so as to be spaced in the direction perpendicular to the cylinder axis.

  The pair of side contact portions 9b, 9b extend upward from the first stopper rubber 11 at a predetermined interval in the cylinder axis direction. Each side contact portion 9b, 9b has a width in the direction perpendicular to the cylinder axis that is smaller than that of the lower contact portion 9a, and when displaced in the direction of the cylinder axis, it extends over the entire width in the direction perpendicular to the cylinder axis. The first stopper rubber 11 is brought into contact with the first stopper rubber 11.

  The fastening portions 9c, 9c are arranged from the upper end portions of the side contact portions 9b, 9b to the cylindrical shaft so that both ends of the contact fitting in the cylinder axis direction are substantially coincident with both ends of the upper top wall portion 5a in the cylinder axis direction. Each extends in the direction. Bolt insertion holes 9d and 9d having the same diameter as the bolt insertion holes 5f and 5f are respectively formed in the fastening portions 9c and 9c at positions corresponding to the bolt insertion holes 5f and 5f of the upper top wall portion 5a. Yes. The fastening portions 9c and 9c are fastened to the upper top wall portion 5a by bolts 19 and nuts 21 (fasteners) inserted through the bolt insertion holes 9d and 9d. 5 is attached.

-Assembly procedure of vibration isolator-
Next, the assembly procedure of the vibration isolator 1 will be described.

  First, a molding die that opens and closes in the same direction as the cylinder axis of the lower mounting bracket 3 is prepared, and the upper mounting bracket 5 having a substantially U-shaped cross section surrounds the upper half of the lower mounting bracket 3 having a rectangular cross section. In such a positional relationship, the mounting brackets 3 and 5 are set in the molding die.

  Next, an unvulcanized rubber composition is injected and filled into a cavity in a molding die through a rubber injection hole (not shown). Then, mold clamping is performed, and the state is maintained at a predetermined temperature for a predetermined time. At this time, the rubber is vulcanized to form a pair of support rubber elastic bodies 7, 7, a first stopper rubber 11, and a pair of second stopper rubbers 13, 13. The side mounting bracket 3 is vulcanized and integrated.

  Thereafter, the molding die is opened, and as shown in FIG. 8, the lower mounting bracket 3, the upper mounting bracket 5, the pair of support rubber elastic bodies 7, 7, the first stopper rubber 11, and the pair of second stopper rubbers 13. , 13 and a semi-finished product integrally formed by vulcanization are taken out. Then, a pair of upper side wall portions 5b, 5b are opened so as to extend in the direction perpendicular to the cylinder axis so that the upper side wall portions 5b, 5b extend substantially straight downward from both ends of the upper top wall portion 5a in the direction perpendicular to the cylinder axis (see FIG. 2). 5b and 5b are squeezed inward in the direction perpendicular to the cylinder axis.

  Next, one end portion (fastening portion 9 c) of the contact fitting 9 is passed through the inside of the rectangular tube-shaped lower attachment fitting 3, and the lower attachment portion 9 a of the contact attachment 9 and the lower attachment fitting 3 are connected. The lower top wall 3b is opposed. Then, the pair of fastening portions 9c, 9c of the contact fitting 9 are brought into contact with the lower surface of the upper top wall portion 5a of the upper mounting fitting 5, and the bolt insertion holes 9d, 9d and the upper top wall portion of the fastening portions 9c, 9c are contacted. The positions of the bolt insertion holes 5f and 5f of 5a are matched. In this state, the contact metal fitting 9 and the upper mounting metal fitting 5 are temporarily assembled by spot welding. Thus, since the contact metal fitting 9 and the upper mounting metal fitting 5 are spot welded, the support rubber elastic bodies 7, 7, the first stopper rubber 11, and the second stopper rubbers 13, 13 are affected by welding heat. Hardly receive.

-Mounting state of vibration isolator to cross member and transmission-
FIG. 13 is a side view schematically showing a state in which the vibration isolator is attached to the transmission. Reference numeral 23 in FIG. 13 indicates an engine, reference numeral 25a indicates a manual transmission, and reference numeral 27 indicates a cross member of the vehicle. This vehicle is a two-wheel drive vehicle, and the engine 23 is mounted vertically. The cross member 27 extends in the vehicle width direction so as to cross the rear end of the manual transmission 25a.

  The manual transmission 25a is set so that the vibration and load in the vertical direction and the vehicle front-rear direction are larger than the vibration and load in the vehicle width direction, depending on conditions such as the arrangement, weight, number of support points, and output. For this reason, the vibration isolator 1 is attached to the cross member 27 and the manual transmission 25a so that the cylinder axis direction substantially coincides with the vehicle width direction.

  Specifically, the vibration isolator 1 places the lower bottom wall portion 3a of the lower mounting member 3 on the upper surface of the cross member 27 and inserts it into the bolt insertion holes 3e and 3e of the lower bottom wall portion 3a. The crimping bolts 15, 15 are inserted into bolt insertion holes 27 a, 27 a formed in the cross member 27 and tightened with nuts (not shown) to be fastened to the cross member 27.

  On the other hand, the vibration isolator 1 is in a state where the upper top wall portion 5 of the upper mounting bracket 5 is in contact with the lower end portion of the manual transmission 25a, and the bolt insertion holes 9d and 9d and the upper top wall portion 5a of the abutting bracket 9. The bolts 19 and 19 inserted from below into the bolt insertion holes 5f and 5f are fastened with nuts 21 and 21 provided on the manual transmission 25a, so that the bolts are attached to the manual transmission 25a. Thus, the abutment fitting 9 is fastened together with the upper mounting fitting 5 to the lower end portion of the manual transmission 25a by the bolts 19 and 19 and the nuts 21 and 21.

-Operation of vibration isolator-
Next, the operation of the vibration isolator 1 will be described.

  For example, when the vibration input from the manual transmission 25a is small, such as after the engine is started, the support rubber elastic bodies 7 and 7 mainly absorb and attenuate vibrations in the vertical direction and the vehicle front-rear direction. Relieve transmission to the car body.

  On the other hand, for example, when traveling on a rough road, if a large downward load is applied to the vibration isolator 1, the support rubber elastic bodies 7 and 7 are deformed downward, and accordingly, the upper mounting bracket 5 is moved downward. Displace. And the upper deformation | transformation of the support rubber elastic bodies 7 and 7 below is suppressed because the upper side top wall part 5a of the upper side attachment metal fitting 5 contact | abuts to the upper surface of the 1st stopper rubber 11. FIG. On the other hand, at the time of rebounding upward, the lower contact portion 9a of the contact fitting 9 contacts the lower surface of the first stopper rubber 11, so that excessive upward displacement of the support rubber elastic bodies 7 and 7 can be suppressed.

  Further, for example, when the vehicle suddenly stops, when the large load acts on the vibration isolator 1 due to the inertial force of the manual transmission 25a, the supporting rubber elastic bodies 7 and 7 are moved forward (in the direction perpendicular to the cylinder axis). ) And the contact fitting 9 is displaced forward of the vehicle. Then, the front end of the lower contact portion 9a of the contact fitting 9 is in contact with the second stopper rubber 13 on the front side, and excessive deformation of the support rubber elastic bodies 7 and 7 toward the rear of the vehicle is suppressed. On the other hand, when the abutting fitting 9 is displaced rearward due to rebounding backward or sudden start of the vehicle, the rear end of the lower abutting portion 9a of the fitting 9 contacts the second stopper rubber 13 on the rear side. In contact therewith, excessive deformation of the support rubber elastic bodies 7 and 7 toward the rear of the vehicle is suppressed.

  Further, when a load is input to the vibration isolator 1 in the vehicle width direction (cylinder axis direction), for example, when the contact fitting 9 is displaced to the right side, the left side contact portion 9b contacts the first stopper rubber 11. On the other hand, when the rebound abutment metal fitting 9 is displaced to the left side, the right side abutment portion 9b abuts on the first stopper rubber 11, and deformation of the support rubber elastic bodies 7 and 7 in the vehicle width direction is suppressed. .

-Effect-
According to the present embodiment, the pair of support rubber elastic bodies 7, 7 integrally connect the lower mounting bracket 3 and the upper mounting bracket 5, so that the lower and upper mounting brackets 3, 5 and the supporting rubber are connected. It is possible to suppress the generation of abnormal noise by rubbing the elastic bodies 7 and 7.

  The abutment metal fitting 9 is attached to the upper attachment metal fitting 5 by fastening the fastening portions 9c, 9c to the upper attachment metal fitting 5 with bolts 19 and nuts 21. After the support rubber elastic bodies 7, 7 and the first and second stopper rubbers 11, 13, 13 are vulcanized, it is possible to suppress the deterioration of the rubber members 7, 7, 11, 13 due to welding heat. it can.

  Furthermore, since the upper mounting bracket 5 and the abutting bracket 9 are provided so as to surround the first stopper rubber 11 formed on the lower mounting bracket 3 with a predetermined interval therebetween, in the unlikely event, the supporting rubber elastic bodies 7 and 7 are provided. Even when the gear is broken, it is possible to suppress the transmission 25 from being largely inclined and falling off.

  Therefore, in the vibration isolator 1 that functions as a stopper in three directions, the deterioration of the durability of the rubber member is suppressed while suppressing the generation of abnormal noise from the vibration isolator 1, and the fall of the transmission 25 is reliably suppressed to fail. Can reach safe.

  In addition, a pair of cutout portions 3g and 3g are formed in the lower top wall portion 3b of the lower mounting bracket 3 so as to cut out both ends in the cylinder axis direction, and between the pair of cutout portions 3g and 3g. Since the thickness of the first stopper rubber 11 covering the surface of the lower top wall main body 3h is set to be smaller than the notch depth of the notches 3g and 3g, The distance between the one stopper rubber 11 and the pair of side contact portions 9b, 9b that are spaced apart from each other in the cylinder axis direction can be reduced. Thereby, the contact metal fitting 9 can be made compact and the vibration isolator 1 can be miniaturized.

  Further, since the vibration isolator 1 is attached to the cross member 27 and the manual transmission 25a so that the cylinder axis direction substantially coincides with the vehicle width direction, for example, when the vehicle suddenly starts or stops, the inertia of the manual transmission 25a. Even when a large load is input in the vehicle longitudinal direction due to the force, the support rubber elastic bodies 7 and 7 absorb the relative vibration between the manual transmission 25a and the vehicle body, and the lower contact portion 9a of the contact fitting 9 2 Excessive displacement of the support rubber elastic bodies 7 and 7 in the longitudinal direction of the vehicle can be suppressed by contacting the stopper rubbers 13 and 13.

  Further, since the abutment fitting 9 is fastened together with the upper mounting fitting 5 to the lower end portion of the manual transmission 25a by the bolt 19 and the nut 21, the influence of the welding heat on the rubber members 7, 7, 11 and 13 by spot welding. Can be temporarily assembled without any need to be provided, and it is not necessary to separately provide a fastening member for fastening to the manual transmission 25a, so that the number of parts of the vibration isolator 1 can be reduced.

(Embodiment 2)
-Configuration of anti-vibration device-
The present embodiment is different from the first embodiment in that a bracket member 17 for attaching the vibration isolator 1 to the transmission 25 is provided. Hereinafter, differences from the first embodiment will be described.

  As shown in FIG. 11, the bracket member 17 includes a substantially rectangular bottom wall portion 17a, side wall portions 17b and 17b extending upward from both longitudinal ends of the bottom wall portion 17a, and a bottom wall portion 17a. It has the standing wall part 17c extended upwards from the one side edge part of a longitudinal orthogonal direction (direction orthogonal to a longitudinal direction and an up-down direction).

  The bottom wall portion 17a has a central portion in the longitudinal direction that is substantially horizontal so that the central portion 5c of the upper top wall portion 5a abuts the entire surface of the bottom wall portion 17a. In order to increase the rigidity of the bolt insertion holes 17e, 17e at both ends in the longitudinal direction, the both ends in the longitudinal direction are formed in a curved shape that swells downward. Two nuts 21 and 21 are welded to the top surface of the bottom wall portion 17a at positions corresponding to the bolt insertion holes 9d and 9d of the contact fitting 9 and the bolt insertion holes 5f and 5f of the upper top wall portion 5a. It is attached. In addition, a bulging portion 17d that bulges upward is formed at substantially the center in the longitudinal direction of the bottom wall portion 17a in order to increase the rigidity of a fastening portion with the transmission 25 (bolt insertion hole 17e in the central portion in the longitudinal direction). ing.

  Each of the side wall portions 17b and 17b is formed by rising both ends in the longitudinal direction of the bottom wall portion 17a formed in a curved shape, and extends upward as it approaches the standing wall portion 17c. These side wall portions 17b and 17b function as ribs that suppress buckling of the standing wall portion 17c together with the bulging portion 17d.

  The standing wall portion 17c is formed so as to have a substantially L-shaped cross section with the bottom wall portion 17a when viewed in the longitudinal direction. Three bolt insertion holes 17e extending in the direction perpendicular to the longitudinal direction for fastening the bracket member 17 to the rear end portion of the transmission 25 are formed in the standing wall portion 17c.

-Assembly procedure of vibration isolator-
Next, the assembly procedure of the vibration isolator 1 will be described. In addition, since the procedure until the lower contact part 9a of the contact metal fitting 9 and the lower top wall part 3b of the lower attachment metal fitting 3 are opposed to each other is the same as that in the first embodiment, the description thereof is omitted.

  As shown in FIG. 12, the direction perpendicular to the cylinder axis of the vibration isolator 1 is made substantially coincident with the longitudinal direction of the bracket member 17, and the pair of fastening portions 9 c, 9 c of the abutment metal fitting 9 is connected to the upper top wall portion of the upper attachment metal fitting 5. The upper surface of the upper top wall portion 5 a is brought into contact with the lower surface of the bracket member 17. Then, the bolt insertion holes 9d, 9d of the fastening portions 9c, 9c, the bolt insertion holes 5f, 5f of the upper top wall portion 5a, and the nuts 21, 21 of the bracket member 17 are aligned. In this state, the two bolts 19 and 19 are inserted from below into the bolt insertion holes 9d and 9d of the abutment metal fitting 9 and the bolt insertion holes 5f and 5f of the upper top wall portion 5a. , 21 to tighten. That is, the contact metal fitting 9 is fastened to the bottom wall portion 17 a of the bracket member 17 together with the upper mounting metal fitting 5 by the bolts 19 and 19 and the nuts 21 and 21 (fasteners). Thus, since the vibration isolator 1 is assembled with only the bolts 19 and 19 and the nuts 21 and 21 after the vulcanization molding, the supporting rubber elastic bodies 7 and 7, the first stopper rubber 11 and the second stoppers are assembled. The rubbers 13 and 13 are not affected at all by the welding heat.

-Mounting state of vibration isolator to cross member and transmission-
FIG. 14 is a side view schematically showing an attachment state of the vibration isolator to the transmission. Reference numeral 23 in FIG. 14 indicates an engine, reference numeral 25b indicates an automatic transmission, and reference numeral 27 indicates a vehicle cross member. This vehicle is a two-wheel drive vehicle, and the engine 23 is mounted vertically. The cross member 27 extends in the vehicle width direction so as to cross the rear of the automatic transmission 25b.

  The automatic transmission 25b is set so that the vibration in the vertical direction and the vehicle front-rear direction is larger than the vibration in the vehicle width direction depending on conditions such as the arrangement, weight, number of support points, and output. For this reason, the vibration isolator 1 is attached to the cross member 27 and the automatic transmission 25b so that the cylinder axis direction substantially coincides with the vehicle width direction.

  Specifically, the vibration isolator 1 places the lower bottom wall portion 3a of the lower mounting member 3 on the upper surface of the cross member 27 and inserts it into the bolt insertion holes 3e and 3e of the lower bottom wall portion 3a. The crimping bolts 15, 15 are inserted into bolt insertion holes 27 a, 27 a formed in the cross member 27 and tightened with nuts (not shown) to be fastened to the cross member 27.

  On the other hand, the vibration isolator 1 is inserted from the rear of the vehicle into the bolt insertion holes 17e, 17e, and 17e of the standing wall portion 17c with the standing wall portion 17c of the bracket member 17 being in contact with the rear end portion of the automatic transmission 25b. The three bolts (not shown) are attached to the automatic transmission 25b by tightening them with nuts (not shown) provided on the automatic transmission 25b.

-Effect-
According to the present embodiment, since the length of the automatic transmission 25b is short, even when the rear end does not reach the cross member 27 of the vehicle, the vibration isolator 1 is connected to the rear end of the automatic transmission 25b via the bracket member 17. Can be attached.

  Moreover, since the vibration isolator 1 is attached to the vehicle body in a state of being fastened to the bottom wall portion 17a of the bracket member 17, there is no need for welding after vulcanization molding. It can be further suppressed.

(Other embodiments)
In each of the above embodiments, the lower and upper mounting brackets 3 and 5 are respectively attached to the cross member 27 and the transmission 25 so that the cylinder axis direction substantially coincides with the vehicle width direction. When the transmission 25 that is set and arranged so that the vibration in the vehicle width direction is larger than that in the front-rear direction is supported by vibration isolation, the lower and upper mounting brackets are arranged so that the direction perpendicular to the cylinder axis substantially coincides with the vehicle width direction. 3 and 5 may be attached to the cross member 27 and the transmission 25, respectively.

  Further, in each of the above embodiments, the notches 3g and 3g are formed at both ends of the lower top wall 3b in the cylinder axis direction. You may make it the same width over the circumference.

  Further, in the first embodiment, the vibration isolator 1 is directly bolted to the manual transmission 25a, and in the second embodiment, the vibration isolator 1 is bolted to the automatic transmission 25b via the bracket member 17, For example, when the length of the manual transmission 25a is short and the length of the automatic transmission 25b is long due to the model of the transmission 25, the number of shift stages, and the like, the vibration isolator 1 is bracketed to the manual transmission 25a. Bolts may be fastened via the member 17 and bolted directly to the automatic transmission 25b.

  Moreover, in each said embodiment, although the vibration isolator 1 was attached to the cross member 27, it is not restricted to this, You may attach the vibration isolator 1 to another vehicle body frame member.

  Furthermore, in each said embodiment, each support rubber elastic body 7 and 7 is made to incline inside, so that it goes below, and the outer corner | angular part 3i of the lower side mounting bracket 3, 3i, and the inner side corner | angular part of the upper side mounting bracket 5 5h and 5h are connected to each other. However, the present invention is not limited to this, and a pair is formed so as to be symmetric with respect to the lower mounting bracket 3, and the outer surface of the lower mounting bracket 3 and the upper mounting bracket 5 Any shape (inclination angle, mounting position, etc.) may be used as long as the inner surface is integrally connected.

  The present invention is not limited to the embodiments, and can be implemented in various other forms without departing from the spirit or main features thereof.

  As described above, the above-described embodiment is merely an example in all respects and should not be interpreted in a limited manner. Further, all modifications and changes belonging to the equivalent scope of the claims are within the scope of the present invention.

  As described above, the present invention is useful for an anti-vibration device or the like that supports an anti-vibration of a transmission with respect to a vehicle body.

It is a perspective view which shows the vibration isolator which concerns on this invention. It is a front view which shows a vibration isolator. FIG. 3 is a cross-sectional view taken along line III-III in FIG. 2. It is a top view which shows a vibration isolator. It is a front view which shows a lower attachment metal fitting. It is a perspective view which shows a lower attachment metal fitting. It is a perspective view which shows an upper attachment metal fitting. It is a front view which shows the upper side and lower side attachment metal fitting after a vulcanization molding. It is a side view which shows a contact metal fitting. It is a top view which shows a contact metal fitting. It is a perspective view which shows a bracket member. It is a front view which shows the vibration isolator attached to the bracket member. It is a side view which shows typically the attachment state to the manual transmission of a vibration isolator. It is a side view which shows typically the attachment state to the automatic transmission of a vibration isolator. It is a front view which shows the conventional vibration isolator. It is arrow sectional drawing of the XVI-XVI line | wire of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Anti-vibration device 3 Lower side attachment metal fitting 3a Lower side bottom wall part 3b Lower side top wall part 3c Lower side wall part 5 Upper side attachment metal part 5a Upper side top wall part 5b Upper side wall part 7 Support rubber elastic body 9 Contact metal fitting 9a Below Side contact portion 9b Side contact portion 9c Fastening portion 11 First stopper rubber 13 Second stopper rubber 17 Bracket member 17a Bottom wall portion 17c Standing wall portion 19 Bolt (fastener)
21 Nut (fastener)
25a Manual transmission (transmission)
25b Automatic transmission (transmission)
27 Cross member (car body)

Claims (5)

A metal fitting formed in a substantially rectangular cylindrical shape, a lower bottom wall portion attached to a vehicle body, a lower top wall portion arranged to face the lower bottom wall portion, a cylinder axis direction and a vertical direction A lower mounting bracket having a pair of lower side wall portions connecting both ends of the lower bottom wall portion and the lower top wall portion in a direction perpendicular to the cylinder axis perpendicular to
An upper top wall portion that is disposed above the lower top wall portion and is attached to the transmission, and a cylinder shaft of the pair of side wall portions that extends downward from both ends of the upper top wall portion in a direction perpendicular to the cylinder axis. An upper mounting bracket having a pair of upper side wall portions opposed to each other at a right angle direction;
A pair of formed so as to be symmetric with respect to the lower mounting bracket, a support rubber elastic body integrally connecting the outer surface of the lower mounting bracket and the inner surface of the upper mounting bracket,
A first stopper rubber that covers the surface of the lower top wall portion between the pair of supporting rubber elastic bodies at a predetermined interval in the vertical direction from the upper top wall portion;
A pair of second stopper rubbers formed so as to protrude inward from the inner side surface of each lower side wall portion in the direction perpendicular to the cylinder axis;
A lower abutting portion extending in a cylinder axis direction below the first stopper rubber at a predetermined interval in a direction perpendicular to the first stopper rubber and in the direction perpendicular to the pair of second stopper rubbers. A pair of side contact parts extending upward from the first stopper rubber at a predetermined interval from both ends in the cylinder axis direction of the lower contact part, and the side contact parts And a contact fitting having a pair of fastening parts that extend outward from the upper end of the cylinder in the cylinder axial direction and are fastened to the upper top wall by a fastener. The vibration isolator according to claim 1, wherein
The lower top wall portion is formed with a pair of notches cut out at both ends in the cylinder axis direction,
The first stopper rubber covers the surface of the lower top wall main body between the pair of notches, and the thickness in the cylinder axis direction is set smaller than the notch depth of the notches. An anti-vibration device characterized in that The vibration isolator according to claim 1 or 2,
The anti-vibration device according to claim 1, wherein the lower and upper mounting brackets are attached to the vehicle body and the transmission, respectively, such that the cylinder axis direction substantially coincides with the vehicle width direction. In the vibration isolator as described in any one of Claims 1-3,
The anti-vibration device according to claim 1, wherein the contact metal fitting is fastened together with the upper mounting metal fitting to the lower end portion of the transmission by the fastener. In the vibration isolator as described in any one of Claims 1-3,
A bracket member having a standing wall portion and a bottom wall portion attached to a rear end portion of the transmission;
The anti-vibration device according to claim 1, wherein the contact metal fitting is fastened together with the upper mounting metal fitting to the bottom wall portion of the bracket member by the fastener.

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