JP2008265627A - Vibration damper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vibration damper increased in durability by suppressing the deformation of the vibrationproof base caused when installed in a vehicle. <P>SOLUTION: One end of a stopper bolt 40 is secured to an upper connection metal fitting 10 connected to an engine side, and the other end of the stopper bolt 40 is inserted into the through hole 22b of a lower connection metal fitting 20. A projecting member 80 is attached to the other end of the stopper bolt 40 projecting from the through hole 22b to the bottom surface side of the lower connection metal fitting 20. When the vibration damper is assembled in the vehicle, the relative position between the upper connection metal fitting 10 and the lower connection metal fitting 20 is prevented from being displaced. As a result, the durability of the vibration damper can be improved by suppressing the deformation of the vibrationproof base 30 caused when assembled in the vehicle. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  According to the present invention, an upper connecting member connected to the engine side, a lower connecting member connected to the vehicle body frame side, and the upper connecting member and the lower connecting member are connected to each other so as to be formed of a rubber-like elastic material. In particular, the present invention relates to a vibration isolator capable of suppressing the distortion of the vibration isolator base during assembly to a vehicle and improving durability.

  As an anti-vibration device for anti-vibration support of an automobile engine with respect to a vehicle frame, for example, there is an anti-vibration device disclosed in Patent Document 1.

  The vibration isolator of the type disclosed in Patent Document 1 includes an upper plate fitting (upper connecting member) connected to the engine side, a lower plate fitting (lower connecting member) connected to the vehicle body frame side, and these A pair of supporting rubber elastic bodies (vibration isolation bases) that elastically connect between the upper and lower plate fittings, and a positioning member 46 that is fixed to the bottom surface of the lower plate fitting.

When assembling this vibration isolator to the vehicle, with the upper plate fitting fastened to the engine side (transmission) with bolts, the engine side is lowered and the lower plate fitting is aligned with the vehicle body frame side. Fasten and fix the bracket and the body frame side with bolts. In this case, the positioning member fixed to the bottom surface of the lower plate metal member is guided by the guide portion formed on the vehicle body frame, whereby the lower plate metal member can be positioned with respect to the vehicle body frame.
Japanese Patent Laid-Open No. 2001-3987 (FIG. 1, paragraph [0017], etc.)

  However, the above-described conventional vibration isolator has a configuration in which a rubber-like elastic material is interposed between the positioning member and the upper plate metal fitting, so that the assembling work to the vehicle is performed between the upper plate metal fitting and the lower plate metal fitting. There was a problem that the relative position of the was easily shifted. Therefore, there has been a problem that the vibration isolator is assembled to the vehicle in a state where the vibration isolating base is distorted, and durability is reduced due to the distortion.

  The present invention has been made in order to solve the above-described problems, and provides a vibration isolator capable of improving durability by suppressing distortion of the vibration isolator base during assembly to a vehicle. It is an object.

  In order to achieve this object, the vibration isolator according to claim 1 includes a lower connecting member in which a through-hole is formed, and an upper connecting member disposed to face the lower connecting member with a predetermined distance therebetween. A member, a pair of anti-vibration bases made of a rubber-like elastic material connecting between the opposing surfaces of the upper connecting member and the lower connecting member, and a rubber-like member disposed on the inner peripheral surface and the peripheral edge of the through hole A stopper rubber portion made of an elastic material; and a shaft-like member having one end fixed to the upper connecting member and the other end inserted through the through hole of the lower connecting member. An upper mounting member that is connected to the engine side and a bottom surface of the lower connecting member is connected to the vehicle body frame side, and is attached to the upper connecting member via the shaft-shaped member; Attached to the lower connecting member and A lower mounting member disposed to face the member with a predetermined distance therebetween, a support base formed of a rubber-like elastic material that connects the opposing surfaces of the upper mounting member and the lower mounting member, and A columnar projecting member attached to the other end side of the shaft-shaped member and projecting from the bottom surface side of the lower connecting member, and the upper mounting member and the lower mounting member And the pair of vibration isolation bases are positioned along the left-right direction of the vehicle, and the fixed position where the shaft-like member is fixed to the upper connecting member is the pair of vibration isolation bases It is set as the position which shifted | deviated to the opposite side to the said support base | substrate with respect to the virtual line which connects the vehicle front-back direction center.

  The anti-vibration device according to claim 2 is the anti-vibration device according to claim 1, wherein an inner peripheral surface shape of the through-hole is formed in an elliptical shape, and the through-hole is in a major axis radial direction of the elliptical shape. Is oriented in the vehicle longitudinal direction and the minor axis radial direction is oriented in the vehicle left-right direction, and the stopper rubber portion has a shape of an inner peripheral surface through which the shaft-like member is inserted and a peripheral edge of the through hole. The outer shape of the portion disposed on the side facing the upper connecting member is formed in an elliptical shape corresponding to the through hole.

  The anti-vibration device according to claim 3 is the anti-vibration device according to claim 1 or 2, wherein the anti-vibration device is made of a rubber-like elastic material and is covered with the lower connecting member, and the pair of anti-vibration bases and the stopper A thin rubber-like lower rubber film part that connects the rubber part is provided.

  The anti-vibration device according to claim 4 is the anti-vibration device according to claim 3, wherein the anti-vibration device is formed of a rubber-like elastic material and is covered with the upper connecting member and is connected to the pair of anti-vibration bases. A rubber film part is provided.

  The anti-vibration device according to claim 5 is the anti-vibration device according to claim 3 or 4, wherein the anti-vibration device comprises a protrusion formed from a rubber-like elastic material and protruding from the lower rubber film portion, and the protrusion The portion is configured as a ridge that connects the pair of vibration-proof bases and the stopper rubber portion, and has a protruding height lower than that of the stopper rubber portion.

  According to the vibration isolator of the first aspect, when assembling to the vehicle, first, the upper connecting member is fastened and fixed to the engine side (transmission) with bolts, and then in this state, the engine side faces the vehicle body frame side. The lower connecting member is fastened and fixed to the vehicle body frame side. In this case, the cylindrical connecting member protruding from the bottom surface side of the lower connecting member is guided by the guide portion formed on the vehicle body frame, so that the lower connecting member can be positioned with respect to the vehicle body frame. it can.

  Here, according to the vibration isolator of the present invention, one end side of the shaft-like member is fixed to the upper connection member connected to the engine side, and the other end side of the shaft-like member is connected to the through-hole of the lower connection member. Since the projecting member is attached to the other end side of the shaft-like member that is inserted through the through hole and protruded from the through hole to the bottom surface side of the lower connecting member, The relative position between the lower connecting member and the lower connecting member can be prevented from shifting. As a result, there is an effect that it is possible to improve the durability by suppressing the distortion of the vibration-proof base during assembly to the vehicle.

  That is, in the conventional vibration isolator, the positioning member (projecting member) is attached to the lower plate metal fitting (lower connection member), and the rubber-like elastic material is interposed between the positioning member and the upper plate metal fitting. is there. Therefore, for example, if the positioning member is displaced with respect to the guide portion due to dimensional variation or work error, the engine side is lowered to the vehicle body frame side with the upper plate fitting fastened to the engine side. In this case, the positioning member is guided in the horizontal direction by the guide member, and the lower metal member is displaced together with the positioning member, so that there is a problem that the relative position between the upper metal plate and the lower metal plate is shifted. As a result, the anti-vibration base is assembled to the vehicle in a state where the distortion is generated, resulting in a decrease in durability.

  On the other hand, according to the vibration isolator of the present invention, the protruding member is connected (fixed) to the upper connecting member via the shaft-shaped member, while the lower connecting member is connected via the vibration isolating base, Even if a load is applied to the projecting member (shaft-shaped member) with the upper connecting member held, the relative position between the upper connecting member and the lower connecting member changes. Does not occur.

  Therefore, even when the projecting member is guided in the horizontal direction by the guide member when the engine side is lowered to the vehicle body frame side with the upper coupling member fastened to the engine side, the lower connection is performed together with the projecting member. The displacement of the member can be avoided, and the relative position between the upper connecting member and the lower connecting member can be maintained. As a result, there is an effect that it is possible to improve the durability by suppressing the distortion of the vibration-proof base during assembly to the vehicle.

  In addition, according to the vibration isolator of the present invention, the upper attachment member attached to the upper connection member, the lower attachment member attached to the lower connection member, the upper attachment member, and the lower side A support base that connects the opposing surfaces of the attachment member, and the upper attachment member and the lower attachment member (that is, the support base) are positioned along the vehicle front-rear direction. There is an effect that it is possible to improve the ride comfort and the handling stability of the vehicle by increasing the rigidity and appropriately adjusting the rigidity in the left-right direction of the vehicle.

  In addition, by increasing the rigidity in the vehicle longitudinal direction, the shaft-shaped member collides with the inner peripheral surface of the through hole even when a large displacement vibration in the vehicle longitudinal direction is input as the vehicle starts or stops. It is possible to suppress the occurrence of hitting sound (abnormal noise).

  Further, according to the vibration isolator of the present invention, the upper attachment member is attached to the upper connecting member via the shaft-like member, that is, the function for the shaft-like member to exert a stopper action and the upper attachment. Since it is the structure which combines the function for attaching a member to an upper side connection member, there is an effect that the number of parts can be reduced and the assembly cost can be reduced and the weight can be reduced accordingly.

  Here, according to the vibration isolator of the present invention, the upper connecting member and the lower member are composed of three pieces of a pair of vibration isolating bases located along the vehicle left-right direction and one support base located along the vehicle front-rear direction. In the configuration in which the side connecting member is connected, the fixing position at which the shaft-like member is fixed to the upper connecting member is shifted to the opposite side of the support base with respect to the virtual line connecting the center of the pair of vibration isolating bases in the vehicle front-rear direction. First, distortion of the vibration isolation base and the support base when manufacturing the vibration isolation device can be suppressed, and second, distortion of the vibration isolation base and the support base during assembly to the vehicle. As a result, the durability can be improved.

  That is, in the manufacture of the vibration isolator, the upper attachment member and the lower attachment member to which the support base is vulcanized and bonded are attached to the upper connection member and the lower connection member to which the vibration isolation substrate is vulcanized and bonded. The structure is attached via a member and a nut. By fixing the fixing position of the shaft-shaped member to the position opposite to the support base as described above, the vibration-proof base and the support base are prevented from being distorted. Meanwhile, the upper attachment member and the lower attachment member can be attached to the upper connection member and the lower connection member.

  Furthermore, when assembling the vibration isolator to the vehicle, the position where the shaft-shaped member is fixed is shifted to the opposite side to the support base as described above, while suppressing the distortion of the vibration isolation base and the support base. The vibration isolator can be assembled to the vehicle.

  According to the vibration isolator described in claim 2, in addition to the effect produced by the vibration isolator described in claim 1, there is an effect that it is possible to suppress the occurrence of sound hitting (abnormal noise).

  Here, according to the vibration isolator of the present invention, a through hole is formed in the lower connecting member, and the other end side of the shaft-like member having one end fixed to the upper connecting member is inserted into the through hole. . Thereby, for example, when a large displacement vibration in the vehicle front-rear direction is input from the engine and a large relative displacement occurs between the upper connecting member and the lower connecting member, the shaft-like member is interposed via the stopper rubber portion. By being received by the inner peripheral surface of the through hole, the displacement of the shaft-like member is restricted, and the stopper action is exhibited.

  In this case, the vibration isolator of the present invention has a configuration in which the inner peripheral surface shape of the through hole is formed in an elliptical shape, and the major axis radial direction of the elliptical shape is oriented in the vehicle front-rear direction. The gap between the holes can be sufficiently ensured in the vehicle front-rear direction. Thereby, even when a large displacement vibration in the vehicle front-rear direction is input as the vehicle starts or stops, the shaft-like member is prevented from colliding with the inner peripheral surface of the through-hole, and the hitting sound (abnormal noise) ) Can be suppressed.

  On the other hand, according to the present invention, the shape of the inner peripheral surface of the through hole is formed in an elliptical shape, and the short axis radial direction of the elliptical shape is directed in the vehicle left-right direction, that is, the entire inner peripheral surface of the through hole is large. Since the vehicle has a smaller diameter in the left-right direction of the vehicle than in the front-rear direction of the vehicle, the displacement of the engine in the left-right direction of the vehicle can be reliably regulated to improve the steering stability of the vehicle. effective.

  As a result, it is not necessary to change the shape and hardness of the vibration isolating base in order to ensure steering stability, and it is possible to avoid sacrificing the spring characteristics of the vibration isolating base in the vehicle vertical direction and vehicle longitudinal direction. In addition to attenuating the vibration in the vehicle vertical direction and adjusting the vehicle longitudinal rigidity appropriately to improve the riding comfort of the vehicle, it is possible to achieve the effect of preventing the generation of abnormal noise. is there.

  Here, for example, when a large displacement vibration in the vehicle vertical direction is input from the engine and a large relative displacement occurs between the upper connecting member and the lower connecting member, the upper connecting member is interposed via the stopper rubber portion. By being received by the lower connecting member, the displacement of the upper connecting member is restricted and the stopper action is exhibited.

  In this case, according to the vibration isolator of the present invention, the stopper rubber portion has an elliptical shape corresponding to the through hole in the outer peripheral portion of the through hole and disposed on the side facing the upper connecting member. Since it is formed, even if it is sandwiched between the upper connecting member and the lower connecting member, the stopper rubber portion is prevented from being damaged and the durability of the stopper rubber portion is improved. There is an effect that can be. As a result, it is possible to reliably exert a buffering action against vibration input in the vehicle vertical direction.

  That is, according to the vibration isolator of the present invention, the outer shape of the stopper rubber portion is formed in an elliptical shape, and the major axis radial direction and the minor axis radial direction of the elliptical shape are directed in the vehicle longitudinal direction and the vehicle lateral direction, respectively. In addition, since the elliptical shape of the stopper rubber portion is similar to the elliptical shape of the through hole, the wrap margin (overlap margin) between the lower connection fitting and the stopper rubber portion at the peripheral portion of the through hole Can be made uniform in the circumferential direction.

  As a result, even if the stopper rubber part is sandwiched between the upper and lower connecting members, it is possible to suppress deformation from concentrating on a part of the circumferential direction, and to prevent damage or dropping off from the through hole. As a result, the durability of the stopper rubber portion can be improved and the stopper action (buffer action) can be reliably exhibited.

  In addition, according to the vibration isolator of the present invention, the shape of the inner peripheral surface (elliptical shape) of the stopper rubber portion through which the shaft-shaped member is inserted is also the elliptical long axis as in the case of the outer shape described above. The radial direction and the minor axis radial direction are directed in the vehicle longitudinal direction and the vehicle lateral direction, respectively, and the elliptical shape of the stopper rubber portion is similar to the elliptical shape of the through hole.

  Therefore, a sufficient gap can be ensured in the vehicle front-rear direction between the shaft-shaped member and the inner peripheral surface of the stopper rubber portion. Accordingly, even when a large displacement vibration in the vehicle front-rear direction is input as the vehicle starts or stops, the displacement of the shaft-like member is inhibited by the stopper rubber portion, and the occurrence of abnormal noise is suppressed. There is an effect that can be.

  At the same time, since the thickness of the stopper rubber portion disposed on the inner peripheral surface of the through hole can be made uniform in the circumferential direction, the stopper rubber portion is sandwiched between the shaft-shaped member and the inner peripheral surface of the through hole. Even if it is done, it can suppress that a part of circumferential direction breaks early.

  Thereby, since the durability of the stopper rubber portion can be improved, the shaft-like member is brought into direct contact with the inner peripheral surface of the through hole (that is, contacted without the stopper rubber portion). As a result, there is an effect that the stopper action (buffer action) can be surely exhibited and the generation of abnormal noise can be more reliably suppressed.

  According to the vibration isolator according to claim 3, in addition to the effect of the vibration isolator according to claim 1 or 2, the lower side that is formed in a thin film shape from the rubber-like elastic material and is covered by the lower connecting member Since the rubber film portion is provided and the vibration isolating base and the stopper rubber portion are connected by the lower rubber film portion, the separation between the vibration isolating base and the lower connecting member, and the stopper rubber portion There is an effect that peeling between the lower connecting member and the durability can be improved.

  According to the vibration isolator of the fourth aspect, in addition to the effect of the vibration isolator according to the third aspect, the upper rubber film portion that is formed in a thin film shape from the rubber-like elastic material and is covered with the upper connecting member is provided. Since the upper rubber film portion is connected to the pair of vibration isolating bases, it is possible to suppress the peeling between the vibration isolating base and the upper connecting member and to improve the durability thereof. There is.

  According to the vibration isolator of claim 5, in addition to the effect of the vibration isolator according to claim 3 or 4, the ridge portion constituted by a rubber-like elastic material and projecting from the lower rubber film portion is provided. And the anti-vibration base and the stopper rubber part are connected by the protruding portion, so that the separation between the anti-vibration base and the lower connecting member, and the stopper rubber part and the lower connecting member As compared with the configuration in which only the lower rubber film portion is provided, there is an effect that the durability can be further improved by more reliably suppressing the peeling.

  In addition, since the projecting height of the protruding portion is lower than the protruding height of the stopper rubber portion, a step is provided, so that the displacement of the upper connecting member is caused by the vibration input of the large displacement in the vehicle vertical direction. When receiving by the lower connecting member, the buffer effect is effectively exerted by the effect of the step, and the impact at the time of collision can be moderated. There is an effect that can be.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described with reference to the accompanying drawings. FIG. 1 is a top view of a vibration isolator 100 according to the first embodiment of the present invention. 2 is a partial cross-sectional view of the vibration isolator 100, FIG. 3 is a bottom view of the vibration isolator 100, and FIG. 4 is a side view of the vibration isolator 100.

  2 corresponds to a cross-sectional view taken along line II-II in FIG. Moreover, arrow UD, arrow LR, and arrow FB in each figure have each shown the up-down direction, the left-right direction, and the front-back direction of the vehicle.

  The vibration isolator 100 is an engine mount that supports an FR (front engine / rear drive) type engine at three points (supported by two front points and one rear point). (See FIG. 2), as shown in FIG. 1 to FIG. 4, the upper connection fitting 10, the lower connection fitting 20, and the vibration-proof base 30, a stopper bolt 40, an upper mounting bracket 50, a lower mounting bracket 60, and a support base 70.

  As shown in FIG. 2, the upper connection fitting 10 is a portion connected to the engine side (transmission TM) via fastening means (not shown) such as a bolt and expands upward (upper side in FIG. 2). The left and right mounting plate portions 11 are opened, and the bottom plate portion 12 and the top plate portion 13 are provided between the left and right mounting plate portions 11.

  The left and right mounting plate portions 11 are portions formed on both sides of the bottom plate portion 12 by bending a long plate made of a steel material symmetrically with respect to the center line L, and are shown in FIGS. As shown in FIG. 4, two plate members are welded and fixed on the upper surface side (upper side in FIG. 2), and two insertion holes 11 a are drilled in a total of four places in the overlapped portions. Yes. Fastening means such as a bolt inserted into the insertion hole 11a is screwed into the engine side member (transmission TM), whereby the upper coupling fitting 10 is fastened and fixed to the transmission TM.

  The upper surface plate portion 13 is a flat plate member on which an upper mounting bracket 50 to be described later is placed. As shown in FIGS. 1 and 2, the upper surface plate portion 13 is installed between the left and right mounting plate portions 11 and fixed by welding. In addition, it is arranged parallel to the bottom plate 12.

  The upper surface plate portion 13 and the bottom surface plate portion 12 are respectively provided with fastening holes 13a and 12a in the center in the width direction (left and right direction in FIG. 2). The fastening holes 13a and 12a are portions to which a stopper bolt 40, which will be described later, is fastened and fixed. The inner peripheral surfaces of the fastening holes 13a and 12a are screwed with male screws engraved on the outer peripheral surface of the stopper bolt 40. Possible female screws are engraved.

  As shown in FIG. 2, the lower connection fitting 20 is a part connected to the vehicle body frame BF via fastening means (not shown) such as a bolt, and is formed by bending a long plate made of a steel material. Thus, the left and right connecting plate portions 21 are expanded toward the upper side (upper side in FIG. 2), and the seating surface plate portion 22 is located between the left and right connecting plate portions 21.

  As shown in FIGS. 1, 2 and 4, the left and right connecting plate portions 21 are arranged so as to face the mounting plate portion 11 of the upper connecting fitting 10 described above, and through a vibration isolation base 3 which will be described later. The upper connection fitting 10 is connected to the mounting plate 11.

  As shown in FIG. 3, the seating surface plate portion 22 has six fastening holes 22 a having internal threads on the inner peripheral surface. Fastening means such as bolts inserted into the vehicle body frame BF are provided on the bottom surface side (lower side in FIG. 2) of fastening holes 22a formed at four locations on one side (upper side in FIG. 3) of the seat surface plate part 22. ), And thereby the lower connection fitting 20 is fastened and fixed to the vehicle body frame BF.

  On the other hand, in the fastening holes 22a formed at two locations on the other side (lower side in FIG. 3) of the seat surface plate portion 22, bolts B inserted into the lower mounting bracket 60 described later are on the upper surface side of the seat surface plate portion 22. The lower mounting bracket 60 is fastened and fixed to the lower connecting bracket 20 (seat surface plate portion 22).

  Further, as shown in FIGS. 1 and 3, a through hole 22 b is formed in the seat surface plate portion 22 at the center in the width direction (left and right direction in FIG. 2). This through-hole 22b is a part for exhibiting a stopper action at the time of large displacement input by interaction with a stopper bolt 40 described later, and the fastening holes 12a and 13a and the top face of the bottom plate portion 12 and the top plate portion 13. It is arranged at an overlapping position in view.

  As shown in FIGS. 1 to 4, the vibration isolation base 30 is formed in a block shape from a rubber-like elastic material, and is between the attachment plate portion 11 of the upper connection fitting 10 and the connection plate portion 21 of the lower connection fitting 20. The two plate portions 11 and 21 are connected to each other in a state inclined at a predetermined angle. As shown in FIGS. 2 and 3, the anti-vibration base 30 has a cross-sectional shape that is a combination of two types of large and small rectangular shapes, and is arranged with the small rectangular parallelepiped sides facing each other.

  As shown in FIG. 2, an upper rubber film portion 31 that covers the bottom surface side (lower surface in FIG. 1) of the bottom surface plate portion 12 is connected to the upper end portion on the inner surface side of the vibration isolation base 30. The upper rubber film part 31 is provided with the same width (dimension in the vertical direction in FIG. 3) as the vibration isolating base 30 except for a predetermined range around the fastening hole 12a in the bottom plate part 12, and the left and right vibration isolating bases 30 are connected to each other. It is comprised so that it may connect.

  Further, as shown in FIG. 2, a lower rubber film portion 32 covering the upper surface side (upper side surface in FIG. 2) of the seat surface plate portion 22 is connected to the lower end portion on the inner surface side of the vibration isolating base 30 (see FIG. 6). ). The lower rubber film portion 32 is provided with the same width (dimension in the vertical direction in FIG. 3) as that of the vibration isolating base 30 except for a predetermined range around the fastening hole 22a in the seating surface plate portion 22. In addition to being connected to each other, a stopper rubber portion 33 and a ridge portion 34 are provided.

  The stopper rubber portion 33 is a portion that is sandwiched between the stopper bolt 40 or the bottom plate portion 12 and the seat plate portion 22 when a large displacement is input, and exhibits a stopper action (buffer action). It is arrange | positioned at the peripheral part and a peripheral part, and it is comprised by the upper surface side and bottom face side (FIG. 1 upper side surface and lower side surface) of the seat surface board part 22, and is comprised by the circular ring of front view circle. Here, with reference to FIG. 5, the detailed structure of the stopper rubber part 33 is demonstrated.

  5A is a cross-sectional view of the vibration isolator 100 taken along the line Va-Va in FIG. 3, and FIG. 5B is a cross-sectional view of the vibration isolator 100 taken along the line Vb-Vb in FIG. As shown in FIG. 5, the through hole 22 b of the bottom plate portion 22 is formed as a circular hole concentric with the axis O of the stopper bolt 40.

  As described above, the stopper rubber portion 33 is disposed on the inner peripheral portion and the peripheral portion of the through hole 22b. As shown in FIG. 5, the inner peripheral surface 33a through which the stopper bolt 40 is inserted, and the bottom plate It is arranged in a cylindrical shape having an upper end surface 33b and a lower end surface 33c that are arranged to face the portion 12 and the positioning member 80 and are formed in a circular shape in front view.

  The cross-sectional shape orthogonal to the axis O of the inner peripheral surface 33a is formed in a circle concentric with the axis O of the stopper bolt 40, and the circle is configured to have a larger diameter than the outer diameter (diameter) of the stopper bolt 40. A predetermined gap is formed between the outer peripheral surface of the stopper bolt 40 (see FIG. 2).

  As shown in FIG. 5, the through-hole 22 b is configured in a stepped shape in which a step portion is formed by forging, so that a larger diameter portion located on the upper end surface 33 b side than the larger diameter portion. A small-diameter portion having a small diameter and positioned on the lower end surface 33c side is provided on the inner peripheral surface.

  Thereby, without changing the clearance (gap) between the stopper rubber part 33 and the bottom plate part 12 or the flange part 41 at 1 W, the rubber volume (thickness dimension in the vertical direction in FIG. 5) of the stopper rubber part 33 is increased. It can be thick on the upper end surface 33b side and thin on the lower end surface 33c side. As a result, the dimension and shape of the vibration isolator 100 required from the mounting position and the installation space with respect to the vehicle (that is, the separation dimension between the upper connecting member 10 and the lower connecting member 20, the height dimension of the vibration isolator 100, etc.). Without changing, the stopper function (buffer function) of the stopper rubber portion 33 can be adjusted.

  Returning to FIG. 1 to FIG. The protrusion 34 is a part for improving the buffer function at the time of the stopper action and improving the durability of the vibration isolating base 30, and protrudes from the lower rubber film part 32 as shown in FIG. It is configured as a ridge. Here, with reference to FIG. 6, the detailed structure of the protrusion part 34 is demonstrated.

  6 is a cross-sectional view of the vibration isolator 100 taken along line VI-VI in FIG. As shown in FIG. 6, the protrusion 34 is formed so as to project in a circular arc shape from the lower rubber film portion 32 covered by the seating surface plate portion 22, and in the width direction of the lower connecting bracket 20 (see FIG. 6). 6 extending in the direction perpendicular to the plane of the drawing (FIG. 2), and is configured as a ridge that connects the lower end of the inner side surface of the vibration isolating base 30 and the stopper rubber portion 33 (see FIG. 2).

  As described above, according to the vibration isolator 100 in the present embodiment, since the protrusion 34 is configured to connect the lower end portion of the inner surface of the vibration isolator base 30 and the stopper rubber portion 33, the vibration isolator base 33 is configured. And the lower connecting fitting 20 (the connecting plate portion 21 and the seating plate portion 22) and the peeling between the stopper rubber portion 33 and the lower connecting fitting 20 (the seating plate portion 22) are Compared with the configuration in which only the rubber film portion 32 is provided, it is possible to more reliably suppress and further improve the durability.

  Here, the protruding portion 34 has a protruding height (dimension in the vertical direction in FIG. 6) lower than the stopper rubber portion 33 (see FIG. 2). Accordingly, when the displacement of the upper connection fitting 10 (bottom plate portion 12) is received by the lower connection fitting 20 (seat surface plate portion 22) with a large displacement vibration input in the vehicle vertical direction (arrow UD direction). In this case, the effect of the step height of the stopper rubber portion 33 and the protruding portion 34 can effectively exert a buffering action, and the impact at the time of collision can be moderated. The occurrence of abnormal noise can be suppressed.

  Returning to FIG. 1 to FIG. The stopper bolt 40 is a part for exerting a stopper action at the time of large displacement input by interaction with the through hole 22b of the seating surface plate part 22, and as shown in FIG. The external thread which is comprised as a body and can be screwed with the internal thread of fastening hole 12a, 13a is engraved on the outer peripheral surface.

  Accordingly, as shown in FIG. 2, the stopper bolt 40 is threadedly engaged with the female thread of the fastening holes 12a and 13a so that one end side (upper side in FIG. 2) is the upper connecting bracket 10 ( The bottom plate portion 12 and the top plate portion 13 are fastened and fixed, and the other end side (the lower side in FIG. 2) is inserted and disposed in the through hole 22 b of the lower connection fitting 20.

  Here, as shown in FIGS. 1 and 2, a nut N is fastened to one end side (the upper side in FIG. 2) of the stopper bolt 40, and the nut N is prevented from loosening by a diameter expanding process. An upper mounting bracket 50 described later is sandwiched and fixed between the seat surface of the nut N and the upper surface of the upper surface plate portion 13.

  As shown in FIG. 2, a flange portion 41 is provided on the other end side (lower side in FIG. 2) of the stopper bolt 40 so as to project outward in the radial direction in a circular disc shape when viewed from the front. The flange portion 41 is a portion for exhibiting a stopper action by interaction with the seating surface plate portion 22 (stopper rubber portion 33) when a large displacement is input in the vehicle upward direction (arrow U direction).

  The state shown in FIG. 2 shows the product state. In this state, the stopper rubber portion 33 is compressed and deformed between the seating surface plate portion 22 and the flange portion 41 of the stopper bolt 40. On the other hand, when the vibration isolator 100 is mounted on the vehicle and supports the transmission TR (at the time of 1 W load), the vibration isolator base 30 is compressed and deformed, and the upper end surface 33b and the lower end surface 33c of the stopper rubber portion 33 (see FIG. 5). A predetermined gap (clearance) is formed between the bottom metal fitting 12 and the flange portion 41.

  As shown in FIGS. 1 to 4, a protruding member 80 is fitted on the other end side (lower side in FIG. 2) of the stopper bolt 40, and the protruding member 80 is prevented from coming off by a diameter expansion process. Has been. Thereby, the protruding member 80 is clamped and fixed between the flange portion 41 of the stopper bolt 40 and the diameter-expanded portion.

  After the upper connecting member 10 is fastened and fixed to the transmission TR, the projecting member 80 lowers the engine side and fastens and fixes the lower connecting member 20 to the vehicle body frame BF. This is a member for positioning the (fastening hole 22a), and is made of a resin material in a tapered cylindrical shape having a smaller diameter toward the tip (lower side in FIG. 2).

  As shown in FIGS. 1 to 4, the vibration isolator 100 includes an upper mounting bracket 50, a first component mainly composed of the upper coupling bracket 10, the lower coupling bracket 20, and the vibration isolation base 30. It is assembled by mounting a second part mainly composed of the lower mounting bracket 60 and the support base 70. Here, the detailed configuration of the second part composed of the upper mounting bracket 50, the lower mounting bracket 60, and the support base 70 will be described with reference to FIGS.

  FIG. 7A is a top view of the second component, and FIG. 7B is a cross-sectional view of the second component taken along line VIIb-VIIb in FIG. 7A. FIG. 8 is a cross-sectional view of the second part taken along line VIII-VIII in FIG.

  As described above, the second part mainly includes the upper mounting bracket 50, the lower mounting bracket 60, and the support base 70. The upper mounting bracket 50 is a portion that is fastened and fixed (attached) to the upper surface side of the upper coupling bracket 10 (upper surface plate portion 13) via a nut N and a stopper bolt 40 (see FIGS. 1 and 2). As shown in FIG. 7, it mainly includes a mounting plate portion 51, a hanging plate portion 52 that hangs down from the mounting plate portion 51, and a curved portion 53 that is positioned between these plate portions 51 and 52. Configured.

  The mounting plate portion 51 is a portion that is mounted on the upper surface of the upper connection fitting 10 (upper surface plate portion 13) (see FIGS. 1 and 2), and is configured in a flat plate shape as shown in FIG. An insertion hole 51a is formed at the center in the width direction (vertical direction in FIG. 7A). When the stopper bolt 40 is inserted into the insertion hole 51 a and the nut N is fastened, the upper mounting bracket 50 is sandwiched and fixed between the upper surface plate portion 13 and the nut N.

  As shown in FIG. 7, the hanging plate portion 52 is a portion to which a support base 70 to be described later is connected, and is suspended from the placement plate portion 51 in a substantially vertical direction (vertical direction in FIG. 7B). At the same time, it is formed wider than the width dimension (vertical dimension in FIG. 7 (a)) of the mounting plate portion 51. The curved portion 53 is a part for securing the strength of the upper mounting bracket 50, and is formed to be curved in an arc shape as shown in FIG.

  The lower mounting bracket 60 is a portion that is fastened and fixed (attached) to the upper surface side of the lower connecting bracket 20 (seat surface plate portion 22) via a bolt B (see FIGS. 1 and 4). As shown in FIG. 1, the mounting plate portion 61, the standing plate portion 62 standing from the mounting plate portion 51, and a pair of rib plate portions 63 that connect these plate portions 61 and 62 are mainly used. It is prepared for.

  The mounting plate portion 61 is a portion that is mounted on the upper surface of the lower connection fitting 20 (seat surface plate portion 22) (see FIGS. 1 and 4), and is configured in a flat plate shape as shown in FIG. At the same time, insertion holes 61a are formed at two locations which are symmetrical with respect to the center (center line L) in the width direction (the vertical direction in FIG. 7A). The bolt B inserted through the insertion hole 61 a is fastened to the fastening hole 22 a of the seating surface plate portion 22, so that the lower attachment fitting 60 is fastened and fixed to the lower connection fitting 20.

  As shown in FIG. 7, the standing plate portion 62 is a portion to which a support base 70 to be described later is connected, and is erected from the placement plate portion 61 in a substantially vertical direction (vertical direction in FIG. 7B). And is disposed so as to face the drooping plate portion 52. The pair of rib plate parts 63 is a part for ensuring the strength of the lower mounting bracket 60, and the rib plate part 63 connects the edge portions of the mounting plate part 61 and the standing plate part 62. Has been.

  As shown in FIG. 7, the support base 70 is formed of a rubber-like elastic material in a rectangular parallelepiped shape having a rectangular cross section, and includes a hanging plate portion 52 of the upper mounting bracket 50 and a standing plate portion 62 of the lower mounting bracket 60. Between the two plate portions 52 and 62, and the two plate portions 52 and 62 are connected to each other in a state where the plate plate is inclined at a predetermined angle (a state where the plate is inclined downward from the hanging plate portion 52 toward the standing plate portion 52).

  In the state where the vibration isolator 100 is mounted on the vehicle and supports the transmission TR (at the time of 1 W load), as described above, the vibration isolator base 30 is compressed and deformed, so that the lower mounting bracket 60 is supported. The upper mounting bracket 50 is lowered, and the support base 70 is arranged in a state parallel to the seat surface plate portion 22. Thereby, the rigidity in the vehicle front-rear direction can be increased, and the riding comfort of the vehicle and the handling stability can be improved.

  Next, an assembling operation when assembling the vibration isolator 100 configured as described above to the vehicle will be described. The anti-vibration device 100 is assembled as a finished product by vulcanizing and molding the first part and the second part in separate processes and mounting the second part on the first part as described above. It is done.

  When assembling the vibration isolator 100 to a vehicle, first, the upper coupling fitting 10 is fastened and fixed to the engine side (transmission TR) with a bolt, and then in this state (a state where the vibration isolator 100 is hung on the engine side). The engine side is lowered toward the vehicle body frame BF, and the fastening hole 22a of the lower connection fitting 20 is aligned with the insertion hole of the vehicle body frame BF.

  In this case, the projecting member 80 protruding from the bottom surface side of the lower connection fitting 20 is guided by the guide portion formed on the vehicle body frame BF, thereby positioning the relative position of the lower connection member 20 with respect to the vehicle body frame BF. can do. Therefore, by inserting the bolt through the insertion hole of the vehicle body frame BF, the bolt can be screwed into the fastening hole 22a of the lower connection fitting 20, and thereby, as shown in FIG. Can be fastened to the vehicle body frame BF, and the vibration isolator 100 can be assembled to the vehicle.

  Here, according to the vibration isolator 100 in the present embodiment, as shown in FIG. 2, one end side of the stopper bolt 40 is fixed to the upper connection fitting 10 connected to the engine side (transmission TR). The other end side of the stopper bolt 40 is inserted into the through hole 22b of the lower connection fitting 20, and a protruding member 80 is attached to the other end side of the stopper bolt 40 protruding from the bottom surface side of the lower connection fitting 20. This is a configuration.

  Therefore, it is possible to suppress the relative position between the upper coupling fitting 10 and the lower coupling fitting 20 from being shifted during the assembly work to the vehicle. As a result, the vibration isolating base 30 and the support at the time of the assembly to the vehicle are supported. It is possible to improve the durability by suppressing the distortion of the base body 70.

  That is, in the conventional vibration isolator, the positioning member (projecting member) is attached to the lower connection fitting, and the vibration isolation base is interposed between the positioning member and the upper connection fitting. For this reason, for example, if the positioning member is displaced with respect to the guide part of the vehicle body frame due to dimensional variation or work error, the engine side is connected to the vehicle body frame side with the upper coupling fitting fastened to the engine side. When the positioning member is lowered to the horizontal position, the positioning member is guided in the horizontal direction by the guide member, and the lower connecting bracket is displaced together with the positioning member, so that the relative position between the upper connecting bracket and the lower connecting bracket is shifted. There was a point. As a result, the anti-vibration base is assembled to the vehicle in a state where the distortion is generated, resulting in a decrease in durability.

  On the other hand, according to the vibration isolator in the present embodiment, as shown in FIG. 2, the protruding member 80 is connected (fixed) to the upper connection fitting 10 via the stopper bolt 40, while the lower side The connection fitting 20 is connected to the upper connection fitting 10 via the vibration isolating base 30 and the support base 70, and a load is applied to the protruding member 80 (that is, the stopper bolt 40) while the upper connection fitting 10 is held. Even if this acts, there is no change in the relative position between the upper connection fitting 10 and the lower connection fitting 20.

  Therefore, the projecting member 80 is guided in the horizontal direction by the guide member of the vehicle body frame BF when the engine side is lowered to the vehicle body frame BF side with the upper coupling fitting 10 fastened and fixed to the engine side (transmission TR). However, it is possible to avoid the displacement of the lower connection fitting 20 together with the projecting member 80, and the relative position between the upper connection fitting 10 and the lower connection fitting 20 can be maintained. As a result, it is possible to improve the durability by suppressing the distortion of the vibration isolating base 30 and the support base 70 during the assembly to the vehicle.

  Further, according to the vibration isolator 100 of the present embodiment, as shown in FIGS. 1 to 4, the vibration isolator 100 is attached to the upper attachment member 50 attached to the upper connection fitting 10 and the lower connection fitting 20. A lower attachment member 60 and a support base 70 for connecting the upper attachment member 50 and the opposing surface of the lower attachment member 60 to each other, and the upper attachment member 50 and the lower attachment member 60 (that is, the lower attachment member 60). Since the support base 70) is positioned along the vehicle front-rear direction (arrow FB direction), the vehicle front-rear direction rigidity is increased and the vehicle left-right direction (arrow RL direction) rigidity is appropriately adjusted. In addition, it is possible to improve the riding comfort of the vehicle and improve the steering stability.

  In addition, by increasing the rigidity in the vehicle longitudinal direction, the stopper bolt 40 collides with the inner peripheral surface of the through hole 22b even when a large displacement vibration in the vehicle longitudinal direction is input as the vehicle starts or stops. It is possible to suppress the occurrence of a hitting sound (abnormal sound).

  Moreover, according to the vibration isolator 100 in the present embodiment, the upper attachment member 50 is attached to the upper connection fitting 10 via the stopper bolt 40, that is, the stopper bolt 40 exhibits a stopper action. Therefore, the number of parts can be reduced and the assembly cost can be reduced and the weight can be reduced. Can do.

  Here, according to the vibration isolator 100 in the present embodiment, as shown in FIGS. 1 to 4, a pair of vibration isolator bases 30 positioned along the vehicle left-right direction (arrow RL direction), and the vehicle When the upper connecting bracket 10 and the lower connecting bracket 20 are connected by three pieces with one support base 70 positioned along the front-rear direction (arrow FB direction), the stopper bolt 40 is connected to the upper connecting bracket. Since the fixed position fixed to 10 is shifted to the opposite side (lower side in FIG. 1) from the support base 70 with respect to the virtual line X connecting the center in the vehicle longitudinal direction of the pair of vibration isolation bases 30, The distortion of the vibration isolation base 30 and the support base 70 when manufacturing the vibration isolation device 100 can be suppressed, and secondly, the distortion of the vibration isolation base 30 and the support base 70 when assembled to the vehicle can be suppressed. As a result, the durability can be improved. Can.

  That is, as described above, the vibration isolator 100 is manufactured by attaching the support base 70 to the upper connecting metal 10 and the lower connecting metal 20 to which the anti-vibration base 30 is vulcanized and bonded. As shown in FIG. 1 or 3, the member 50 and the lower attachment member 60 are attached via the stopper bolt 40 and the nut N (that is, the second part is attached to the first part). Furthermore, the position where the stopper bolt 40 is fixed is shifted to the opposite side (lower side in FIG. 1) from the support base 70 with respect to the virtual line X as described above, so that the vibration-proof base 30 and the support base 70 are distorted. The upper attachment member 50 and the lower attachment member 70 can be attached to the upper connection fitting 10 and the lower connection fitting 20 while suppressing the above.

  Further, when the vibration isolator 100 is assembled to the vehicle, as shown in FIG. 1 or 3, the fixing position of the stopper bolt 40 is opposite to the support base 70 with respect to the virtual line X as described above (FIG. 1). By setting the position shifted to the lower side, the vibration isolator 100 can be assembled to the vehicle while suppressing the distortion of the vibration isolator base 30 and the support base 70.

  Next, a second embodiment will be described with reference to FIG. FIG. 9 is a cross-sectional view showing a vibration isolator 200 according to the second embodiment, and FIGS. 9A and 9B correspond to FIGS. 5A and 5B, respectively. In FIG. 9, the initial position of the stopper bolt 40 at 1 W is virtually illustrated using a two-dot chain line.

  In 1st Embodiment, although the through-hole 22b of the seat surface board part 22 and the inner peripheral surface 33a of the stopper rubber part 33 were comprised by the front view circular shape, the seat surface board part 222 in 2nd Embodiment was demonstrated. The through hole 222b and the inner peripheral surface 233a of the stopper rubber part 233 are configured in an elliptical shape. In addition, the same code | symbol is attached | subjected to the part same as 1st Embodiment mentioned above, and the description is abbreviate | omitted.

  As shown in FIG. 9, the through hole 222b in the second embodiment is formed in an elliptical shape when viewed from the front. Specifically, the inner peripheral surface shape of the through hole 222b is formed in an elliptical shape when viewed from the front, and the major axis radial direction of this elliptical shape is the vehicle front-rear direction (the direction of the arrow FB) as shown in FIG. ) And the short-axis radial direction is directed in the left-right direction of the vehicle (arrow LR direction) as shown in FIG.

  Further, as shown in FIG. 9, the stopper rubber portion 233 is the shape of the inner peripheral surface 233a through which the stopper bolt 40 is inserted, and the peripheral portion of the through hole 222b. 2) and the shape of the lower end surface 233c disposed opposite to the flange portion 41 are formed in an elliptical shape corresponding to the inner peripheral shape of the through hole 222b.

  That is, as shown in FIG. 9, the stopper rubber portion 233 has an inner peripheral surface 233a and upper and lower end surfaces 233b and 233c formed in an elliptical shape when viewed from the front, and the major axis radial direction and minor axis radial direction of the ellipse are respectively shown. Oriented in the vehicle longitudinal direction (arrow FB direction) and vehicle left-right direction (arrow LR direction), and the elliptical shape of the inner peripheral surface 233a and the upper and lower end surfaces 233b, 233c is similar to the elliptical shape of the through hole 222b. The configuration is an elliptical shape.

  As a result, as shown in FIG. 9 (b), the gaps tF and tB in the vehicle front-rear direction (arrow FB direction) between the stopper bolt 40 and the through hole 222b can be sufficiently ensured. Even when a large displacement vibration in the vehicle front-rear direction is input as the vehicle starts or stops, the stopper bolt 40 is prevented from colliding with the inner peripheral surface of the through hole 222b, and a sound is generated (abnormal noise). Can be suppressed.

  The upper and lower end surfaces 233b and 233c are configured as surfaces parallel to the seat plate portion 222. The short axis radius of the upper end surface 233b (the horizontal dimension in FIG. 9A) is the width dimension (the horizontal dimension in FIG. 2) of the lower flat surface (the lower side surface in FIG. 2) of the bottom plate 12 of the upper coupling fitting 10. ) Is set to the same or shorter length, and the major axis radius of the upper end surface 233b (the horizontal dimension in FIG. 9B) is the lower flat surface (the lower side surface in FIG. 2) of the bottom plate portion 12 of the upper connection fitting 10. Is set to a length shorter than the depth dimension (dimension in the vertical direction in FIG. 2). On the other hand, the major axis radius (dimension in the left-right direction of FIG. 9B) of the lower end surface 233c is set to be equal to or shorter than the diameter of the flange portion 41 (see FIG. 2) of the stopper bolt 40.

  Thereby, damage, such as a piece of rubber of stopper rubber part 40, can be prevented and durability can be improved. In addition, the rubber volume can be effectively utilized to sufficiently exhibit the buffering action at the time of the stopper action, and the occurrence of the hitting sound (abnormal sound) can be suppressed.

  On the other hand, according to the vibration isolator 200 in the present embodiment, as shown in FIG. 9, the inner peripheral surface of the through hole 222b is formed in an elliptical shape when viewed from the front, and the short axis radius direction of the elliptical shape is set to the left and right sides of the vehicle. Rather than directing in the direction (arrow L-R direction), that is, increasing the diameter of the entire inner peripheral surface of the through-hole 222b, the vehicle left-right direction has a smaller diameter than the vehicle front-rear direction (arrow FB direction). With this configuration (tF, tB <tL, tR), the displacement of the engine in the left-right direction of the vehicle can be reliably regulated to improve the steering stability of the vehicle.

  As a result, it is not necessary to change the shape or hardness of the vibration isolating base 30 and the support base 70 in order to ensure the steering stability of the vehicle, and the vehicle vertical direction (arrow UD direction) or the vehicle front-back direction (arrow) Since it is possible to avoid sacrificing the spring characteristics of the vibration isolating base 30 and the support base 70 in the direction FB), the vibration in the vertical direction of the vehicle is attenuated and the rigidity in the front and rear direction of the vehicle is adjusted appropriately. The improvement of the riding comfort and the improvement of the handling stability can be achieved together with the prevention of abnormal noise.

  Further, as described above, since the upper and lower end surfaces 233b and 233c are formed in an elliptical shape corresponding to the through hole 222b, the stopper rubber portion 233 has a peripheral portion of the through hole 222b as shown in FIG. The lap allowance (overlap allowance) between the seat plate portion 222 and the stopper rubber portion 233 (upper and lower end surfaces 233b and 233c) can be made uniform in the circumferential direction.

  As a result, the stopper rubber portion 233 is sandwiched between the bottom plate portion 12 or the flange portion 41 (see FIG. 2) and the seat surface plate portion 22 in accordance with a large displacement input in the vehicle vertical direction (arrow UD direction). However, it is possible to suppress the deformation from being concentrated on a part of the stopper rubber portion 233 in the circumferential direction. As a result, it is possible to prevent the stopper rubber portion 33 from being damaged due to running out of rubber or the like and dropping off from the through hole 222b, so that the durability can be improved and the stopper action (buffer action) can be improved. It can be demonstrated reliably.

  Furthermore, according to the vibration isolator 200 in the present embodiment, the shape (elliptical shape) of the inner peripheral surface 233a of the stopper rubber portion 233 is similar to the elliptical shape of the through hole 222b as in the case of the upper end surface 233b. Because of the configuration, a sufficient gap in the vehicle front-rear direction (arrow FB direction) between the stopper rubber portion 233 (inner peripheral surface 233a) and the stopper bolt 40 can be secured.

  As a result, even when a large displacement vibration in the vehicle longitudinal direction is input as the vehicle starts or stops, the displacement of the stopper bolt 40 is hindered by the inner peripheral surface 233a of the stopper rubber portion 233 and noise is generated. It can suppress becoming easy.

  At the same time, the thickness (for example, the horizontal dimension in FIG. 9A) of the stopper rubber portion 233 disposed on the inner peripheral surface of the through hole 222b (covering the inner peripheral surface) can be made uniform in the circumferential direction. Therefore, even if the stopper rubber portion 233 is sandwiched between the stopper bolt 40 and the inner peripheral surface of the through hole 222b, a part in the circumferential direction (that is, the portion where the above-described thickness is thin) is early. It is possible to suppress damage and the like.

  As a result, the durability of the stopper rubber portion 233 can be improved, so that the stopper bolt 40 is brought into direct contact with the inner peripheral surface of the through hole 222b (that is, without contact with the stopper rubber portion 233). As a result, the stopper action (buffer action) can be reliably exhibited, and the occurrence of abnormal noise can be more reliably suppressed.

  As shown in FIG. 9, the inner peripheral surface 233a of the stopper rubber portion 233 is formed linearly along the outer peripheral surface of the stopper bolt 40 (that is, along the vehicle vertical direction).

  The present invention has been described above based on the embodiments. However, the present invention is not limited to the above embodiments, and various improvements and modifications can be made without departing from the spirit of the present invention. It can be easily guessed.

  The numerical values (for example, the quantity, size, angle, etc. of each component) given in the above embodiments are examples, and other numerical values can naturally be adopted.

  In the second embodiment, the case where the through hole 222b and the inner peripheral surface 233a have an elliptical shape when viewed from the front has been described. However, the present invention is not necessarily limited to this, and other shapes are naturally possible. That is, it is sufficient that the gaps tF and tB in the vehicle front-rear direction (arrow FB direction) can be made larger than the gaps tR and tL in the vehicle left-right direction (arrow RL direction). Therefore, examples of other shapes include an oval shape and a rectangle.

  In each of the above-described embodiments, the case where the protrusion 34 is provided only on the lower rubber film portion 32 has been described. However, the present invention is not necessarily limited to this, and in addition to or instead of this, the upper rubber film portion 31 is provided. Of course, it is possible to provide the protrusion 34. Further, the number of the protrusions 34 is not limited to one, and it is naturally possible to dispose a plurality of protrusions with an interval in the depth direction (left-right direction in FIG. 2).

It is a top view of the vibration isolator in 1st Embodiment of this invention. It is a fragmentary sectional view of a vibration isolator. It is a bottom view of a vibration isolator. It is a side view of a vibration isolator. (A) is sectional drawing of the vibration isolator in the Va-Va line of FIG. 3, (b) is sectional drawing of the vibration isolator in the Vb-Vb line of FIG. It is sectional drawing of the vibration isolator in the VI-VI line of FIG. (A) is a top view of the second component, and (b) is a cross-sectional view of the second component taken along line VIIb-VIIb in FIG. 7 (a). It is sectional drawing of the 2nd components in the VIII-VIII line of FIG.7 (b). It is sectional drawing which shows the vibration isolator in 2nd Embodiment, (a) and (b) respond | correspond to Fig.5 (a) and FIG.5 (b), respectively.

Explanation of symbols

100 Anti-Vibration Device 10 Upper Connection Fitting (Upper Connection Member)
20 Lower connection bracket (lower connection member)
22b, 222b Through-hole 30 Anti-vibration base 31 Upper rubber film part 32 Lower rubber film part 33, 233 Stopper rubber part 33a, 233a Inner peripheral surface 33b, 233b Upper end surface 34 Projection part 40 Stopper bolt (shaft-shaped member)
50 Upper mounting bracket (Upper mounting member)
60 Lower mounting bracket (lower mounting member)
70 support base 80 projecting member TM transmission (part on the engine side)
BF Body frame FB Vehicle longitudinal direction LR Vehicle lateral direction X Virtual line

Claims (5)

A lower connecting member in which a through hole is formed, an upper connecting member arranged to face the lower connecting member with a predetermined interval therebetween, and a connection between the opposing surfaces of the upper connecting member and the lower connecting member. A pair of anti-vibration bases made of rubber elastic material, a stopper rubber portion made of rubber-like elastic material disposed on the inner and peripheral surfaces of the through hole, and one end side of the upper connecting member A shaft-shaped member that is fixed and has the other end side inserted and disposed in the through hole of the lower connecting member, and the upper surface of the upper connecting member is connected to the engine side and the bottom surface of the lower connecting member is In the vibration isolator connected to the body frame side,
An upper attachment member that is attached to the upper connection member via the shaft-like member, and an attachment member that is attached to the lower connection member and that faces the upper attachment member with a predetermined distance therebetween. A lower base member, a support base made of a rubber-like elastic material connecting the opposing surfaces of the upper side and lower side attachment members, and the other end of the shaft-like member A columnar protruding member protruding from the bottom surface side of the lower connecting member,
The upper mounting member and the lower mounting member are positioned along the vehicle front-rear direction, the pair of vibration isolation bases are positioned along the vehicle left-right direction, and the shaft-shaped member is connected to the upper connection The anti-vibration device according to claim 1, wherein the fixing position fixed to the member is a position shifted to the opposite side of the support base with respect to a virtual line connecting the center of the pair of anti-vibration bases in the vehicle front-rear direction. The inner peripheral surface of the through hole is formed in an elliptical shape, and the through hole has a direction in which the major axis radial direction of the elliptical shape points in the vehicle front-rear direction and the minor axis radial direction points in the vehicle left-right direction Placed in
The stopper rubber portion has a shape of an inner peripheral surface through which the shaft-shaped member is inserted and an outer shape of a portion disposed on the side of the peripheral portion of the through hole facing the upper connecting member. 2. The vibration isolator according to claim 1, wherein the vibration isolator is formed in an elliptical shape corresponding to the hole.   It is composed of a rubber-like elastic material, and is provided with a thin film-like lower rubber film portion that connects the pair of anti-vibration bases and the stopper rubber portion while being covered with the lower connection member. The vibration isolator according to claim 1 or 2.   4. The vibration isolator according to claim 3, further comprising a thin-film upper rubber film portion which is made of a rubber-like elastic material and is covered with the upper connecting member and connects the pair of vibration isolating bases. . Comprising a ridge formed of a rubber-like elastic material and projecting from the lower rubber film portion;
The said protrusion part is comprised as a protrusion which connects a pair of said anti-vibration base | substrate and the said stopper rubber part, The protrusion height is made lower than the said stopper rubber part, It is characterized by the above-mentioned. Or the vibration isolator of 4.

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