JP2010084791A - Vibration isolating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance rigidity without increasing the size of a vibration isolating device, in the vibration isolating device for supporting a transmission on a vehicle body while suppressing the vibration. <P>SOLUTION: The isolating vibration device 1 includes lower side and upper side attaching brackets 3, 5 and support rubber elastic bodies 7, 7. The lower side attaching bracket 3 has a lower side horizontal portion 3a mounted on the vehicle body, and lower side inclining portions 3b, 3b extending from both sides of the lower side horizontal portions 3a obliquely upward. The upper side attaching bracket 5 has an upper side horizontal portion 5a, upper side inclining portions 5b, 5b extending from the upper side horizontal portion 5a obliquely upward, and upper side attaching brackets 5c, 5c mounted on the transmission. The support rubber elastic bodies 7, 7 connect the upper side inclining portions 5b, 5b and lower side inclining portions 3b, 3b. The isolating vibration device 1 includes a stopper rubber 11 for covering the periphery of a through-hole 5d of the upper side horizontal portion 5a, and a trestle 9 mounted on the lower side horizontal portion 3a opening in the attaching bracket longitudinal direction by fixing the lower end of a stopper bolt 31 passing through the through-hole 5d. <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.

  Conventionally, a support rubber elastic body (insulator) which is attached to a vehicle body frame such as a cross member so as to support a power unit such as an engine or a transmission (transmission) and attenuates vibration from the power unit so as not to be transmitted to the vehicle body, A vibration isolator having a stopper that suppresses excessive displacement of a support rubber elastic body is known.

  For example, Patent Document 1 discloses a vibration isolator that can be disposed in a narrow mounting space between an engine and a vehicle body member. As shown in FIG. 9, the vibration isolator 101 is provided with an upper plate 105 having a mounting hole 105d formed at the center thereof, and opposed to the lower portion of the upper plate 105, and an insertion hole 109c formed at the center. The lower plate metal fitting 103 having the intermediate projecting portion 109 is provided, and a pair of support rubber elastic bodies 107 and 107 elastically connect the upper plate metal fitting 105 and the lower plate metal fitting 103.

  In this vibration isolator 101, the threaded portion 131 of the mounting support 133 is sequentially inserted into the insertion hole 109c of the intermediate projecting portion 109 and the mounting hole 105d of the upper plate fitting 105, and is fixed to the engine (not shown). The lower plate fitting 103 is fixed to a vehicle body side member (not shown) with bolts (not shown) and nuts 115 and 115. Accordingly, the upper plate metal 105 is pressed against the engine side, the flat head portion 135 of the mounting support 133 is accommodated in the central protrusion 109, and the intermediate protrusion 109 of the lower plate metal 103 is connected to the upper plate metal 105. And the head 135 of the mounting support 133.

By configuring the vibration isolator 101 in this manner, the upward displacement of the engine is restricted by a stopper constituted by the head 135 and the intermediate protrusion 109. Further, the upper plate metal 105 functions as a stopper for the intermediate projecting portion 109, and the mounting support 133 functions as a vehicle front-rear and left-right direction stopper for the insertion hole 109c.
JP-A-2005-240926

  However, the thing of the said patent document 1 has the following problems. That is, when attaching the vibration isolator to a cross member (vehicle body), for example, the bolt insertion holes formed in the longitudinal direction (vehicle width direction) of the cross member are often used. When the interval between the formed bolt insertion holes is narrower than the interval between the bolt insertion holes 103a and 103a of the vibration isolator 101 and is substantially equal to the interval between the vertical portions 109a and 109a constituting the intermediate protrusion 109, the vertical The portions 109a and 109a interfere with the nuts 115 and 115. In order to prevent such interference between the vertical portions 109a and 109a and the nuts 115 and 115, if a new bolt insertion hole is formed in the cross member in addition to the existing bolt insertion hole, the strength of the cross member may be reduced. .

  For this reason, it can be considered that the interval between the vertical portions 109a and 109a is increased, that is, the central protruding portion 109 is enlarged. However, if the central protruding portion 109 is enlarged, the vibration isolator 101 itself is increased in size. .

  In addition, since the intermediate protrusion 109 is formed by bending the lower plate metal fitting 103, when the power unit vibrates greatly in the rolling direction with respect to the vehicle body and a large load is input in the metal fitting longitudinal direction, There is a possibility that sufficient support rigidity cannot be secured.

  The present invention has been made in view of the above points, and an object of the present invention is to provide a vibration isolator that supports a transmission with respect to a vehicle body in a vibration isolating manner without increasing the size of the vibration isolator. It is to provide a technology for improvement.

  1st invention is a metal fitting of a long thing, and it inclines upwards as it goes to the metal plate longitudinal direction outside from the metal plate longitudinal direction both ends attached to a vehicle body, and the lower horizontal part. A lower mounting bracket having a pair of lower inclined portions, an upper horizontal portion in which a through-hole extending in the vertical direction is formed in the center, and a bracket from both ends of the upper horizontal portion in the longitudinal direction of the bracket A pair of upper inclined portions extending obliquely upward as going outward in the longitudinal direction, and an upper mounting portion extending from the both ends of the upper inclined portion in the longitudinal direction of the bracket to the outer side in the longitudinal direction of the bracket and attached to the transmission An upper mounting bracket disposed opposite to the lower mounting bracket, a pair of support rubber elastic bodies respectively connecting the upper inclined portions and the lower inclined portions, and the through holes The upper horizontal so as to cover the inner peripheral surface and peripheral edge An annular stopper rubber formed on the annular stopper rubber, a stopper pin passing through the stopper rubber with a predetermined interval in the radial direction thereof, and an upper stopper attached to the stopper pin above the upper horizontal portion. A stopper plate, a fastening member for mounting the lower horizontal portion to the vehicle body, which is arranged in parallel with the lower horizontal portion, and a closed cross section that opens in the metal longitudinal direction; It is attached to the said lower horizontal part so that the said fastening member may be straddled, and the mount to which the lower end part of the said stopper pin is being fixed to the upper end part is provided.

  According to the first aspect of the present invention, the lower surface of the stopper rubber formed on the upper horizontal portion abuts against the upper surface of the gantry during the bump, while the upper surface of the stopper rubber contacts the stopper plate during the rebound. Excessive vertical displacement of the elastic body can be suppressed.

  In addition, when a large load is input in the bracket longitudinal direction and the bracket longitudinal direction (direction perpendicular to the bracket longitudinal direction and the vertical direction), the annular stopper rubber contacts the stopper pin. Excessive displacement in the direction and the direction perpendicular to the longitudinal direction of the metal fitting can be suppressed.

  Furthermore, since the base to which the lower end of the stopper pin is fixed has a closed cross section that opens in the longitudinal direction of the metal fitting and is attached to the lower horizontal part so as to straddle the fastening member, the number of fastening members increases. Even if the interval between the fastening members in the longitudinal direction of the metal fittings is increased, interference with the fastening members can be avoided. Therefore, since it is not necessary to enlarge the mount in order to avoid interference with the fastening member, it is possible to suppress an increase in the size of the vibration isolator.

  In addition, the gantry has a closed cross section with the lower mounting bracket, and its side surface extends in the longitudinal direction of the bracket and functions as a rib of the lower mounting bracket. Can be increased.

  In a second aspect based on the first aspect, the lower and upper mounting brackets are mounted on the vehicle body and the transmission, respectively, such that the longitudinal direction of the bracket is substantially coincident with the vehicle width direction. Is.

  According to the second invention, for example, even when the transmission vibrates greatly in the rolling direction with respect to the vehicle body and a large load is input in the vehicle width direction, the relative vibration between the transmission and the vehicle body is caused by the support rubber elastic body. Can be absorbed. Further, the support strength in the vehicle width direction can be increased by matching the longitudinal direction of the metal fitting whose rigidity is enhanced by the gantry with the vehicle width direction.

  According to the present invention, the frame on which the lower end portion of the stopper pin is fixed is attached to the lower horizontal portion so as to form a closed cross section that opens in the longitudinal direction of the metal fitting and straddles the fastening member. The anti-vibration device can be prevented from increasing in size and form a closed cross section with the lower mounting bracket and also functions as a rib for the lower mounting bracket. The rigidity in the longitudinal direction of the metal fitting can be increased.

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

-Configuration of anti-vibration device-
FIG. 1 is a front view showing a vibration isolator according to the present invention, FIG. 2 is a top view, and FIG. 3 is a side 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. 8), 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 attached to the cross member 27, an upper mounting bracket 5 attached to the transmission 25, and a pair of support rubbers integrally connecting the mounting brackets 3 and 5. Elastic bodies (insulators) 7, 7, a base 9 attached to the lower mounting bracket 3, a stopper bolt 31 fixed to the base 9, and a stopper plate 13 attached to the stopper bolt 31 A stopper rubber 11 formed integrally with the upper mounting bracket 5, and two crimping bolts (fastening members) 15, 15 for mounting the lower mounting bracket 3 to the cross member 27.

  The lower mounting bracket 3 is a long bracket formed by bending a substantially rectangular steel plate. The lower mounting bracket 3 includes a lower horizontal portion 3a to be attached to the cross member 27, and a longitudinal length of the lower horizontal portion 3a in the bracket longitudinal direction (a direction connecting the pair of support rubber elastic bodies 7 and 7). A pair of lower inclined portions 3b, 3b extending obliquely upward as they go outward in the longitudinal direction of the metal fitting from both ends in the direction.

  The lower horizontal portion 3a is provided with two bolt insertion holes 3c, 3c extending in the vertical direction in the longitudinal direction of the metal fitting. Caulking bolts 15 and 15 are inserted through these bolt insertion holes 3c and 3c. The caulking bolts 15 and 15 are attached to the lower horizontal portion 3a by caulking the hole wall portions of the bolt insertion holes 3c and 3c. The lower mounting bracket 3 is fixed to the vehicle body by fastening these caulking bolts 15, 15 to the cross member 27 of the vehicle. Further, the gantry 9 is attached to the lower horizontal portion 3a.

  Each of the lower inclined portions 3b and 3b extends obliquely upward at an angle of approximately 30 degrees from both ends of the lower horizontal portion 3a in the longitudinal direction of the metal fitting. Each of these lower inclined portions 3b, 3b is provided with lower reinforcing portions 35, 35 for enhancing the spring characteristics of the vibration isolator 1 in the vertical direction of the bracket perpendicular to the vertical direction and the longitudinal direction of the bracket. Yes.

  The gantry 9 is formed by bending a steel plate, and is inclined to the outer side in the bracket longitudinal direction as it goes downward from both ends of the substantially rectangular top wall 9a and the bracket longitudinal perpendicular direction of the top wall 9a. It has the substantially trapezoidal side wall parts 9b and 9b extended. As shown in FIG. 4, the gantry 9 forms a closed cross section that opens in the longitudinal direction of the metal fitting by welding the lower ends of the side wall portions 9b and 9b to the lower horizontal portion 3a. It is fixed to the lower horizontal part 3a so as to straddle. In other words, the gantry 9 is formed in a hollow trapezoidal shape with the lower horizontal portion 3a as the bottom when viewed from the longitudinal direction of the bracket, and extends in the longitudinal direction of the bracket so as to cover the two caulking bolts 15 and 15. An attachment hole 9c extending in the vertical direction for attaching and fixing the stopper bolt 31 is formed in the center of the top wall portion 9a. Furthermore, a nut 39 is attached to the lower surface of the top wall portion 9a by welding so as to cover the peripheral portion of the attachment hole 9c.

  On the other hand, the lower reinforcing portion 35 is formed by bending a steel plate having a thickness smaller than that of the lower mounting bracket 3, extends in the inclination direction of the lower inclined portion 3 b, and is a lower end portion of the support rubber elastic body 7. The reinforcing main body portion 35a is formed in an inverted V-shaped cross section when viewed from the inclined direction so as to be cut out, and the flange portions 35b and 35b extending outward from the lower end portion of the reinforcing main body portion 35a in the direction perpendicular to the metal fitting longitudinal direction. And have. The lower reinforcing portions 35 and 35 are attached to the lower mounting bracket 3 by welding the flange portions 35b and 35b to the lower inclined portions 3b and 3b.

  The upper mounting bracket 5 is formed by bending a substantially rectangular steel plate, and is inclined upward as it goes outward in the bracket longitudinal direction from the upper horizontal portion 5a and both ends of the upper horizontal portion 5a in the bracket longitudinal direction. A pair of upper inclined portions 5b, 5b that extend and a pair of upper mounting portions 5c, 5c that extend outward from these upper inclined portions 5b, 5b and are attached to the transmission 25; It is arranged opposite to the metal fitting 3.

  The upper horizontal portion 5a is disposed above the lower horizontal portion 3a of the lower mounting bracket 3 with a predetermined distance from the top wall portion 9a of the gantry 9 in the vertical direction. The upper horizontal portion 5a has a through hole 5d extending in the vertical direction at the center thereof.

  Each of the upper inclined portions 5b, 5b is inclined approximately 30 degrees from both ends of the upper horizontal portion 5a in the longitudinal direction of the metal fitting (in parallel with the lower inclined portions 3b, 3b) and extends obliquely upward. Oppositely arranged diagonally above the portions 3b, 3b. Each upper inclined portion 5b, 5b is provided with upper reinforcing portions 37, 37 for improving the spring characteristics in the direction perpendicular to the longitudinal direction of the vibration isolator 1.

  The upper mounting portions 5c and 5c are inclined by approximately 45 degrees from the upper wall portions 5f and 5f extending upward from the longitudinal ends of the upper inclined portions 5b and 5b, and from the upper ends of the vertical wall portions 5f and 5f. And inclined portions 5g and 5g extending obliquely upward. As described above, the upright wall portions 5f and 5f are formed on the upper mounting portions 5c and 5c in the state where the vibration isolator 1 is attached to the transmission 25 in the vertical direction between the transmission 25 and the vibration isolator 1. This is to ensure the interval (to suppress interference between the stopper bolt 31 and the transmission 25). Two bolt insertion holes 5e, 5e extending in a direction orthogonal to the inclined portions 5g, 5g are formed in each inclined portion 5g, 5g, and bolts inserted into the bolt insertion holes 5e, 5e (see FIG. The vibration isolator 1 is attached to the transmission 25.

  Each of the upper reinforcing portions 37, 37 is formed by bending a steel plate that is thinner than the upper mounting bracket 5, and swells outward from the top wall portion 37a and both ends of the top wall portion 37a in the direction perpendicular to the bracket longitudinal direction. Side walls 37b, 37b extending downward while forming a curved shape are formed so as to sandwich the upper end portions of the support rubber elastic bodies 7, 7 from the direction perpendicular to the metal fitting longitudinal direction. In other words, each of the upper reinforcing portions 37, 37 extends in the inclination direction of each of the upper inclined portions 5b, 5b, and is formed in an inverted U-shaped cross section when viewed from the inclined direction, as shown in FIG. The wall portions 37a and the side wall portions 37b and 37b surround the upper end portions of the supporting rubber elastic bodies 7 and 7, respectively. The upper reinforcing portions 37 and 37 are attached to the upper mounting bracket 5 by welding the top wall portions 37a and 37a to the upper inclined portions 5b and 5b. The side wall portions 37b and 37b extend downward within a range that does not overlap the lower reinforcing portion 35 in the vertical direction.

  Each of the supporting rubber elastic bodies 7 and 7 is a rubber member integrated with the upper mounting bracket 5 and the lower mounting bracket 3 by vulcanization, and is inclined outward in the longitudinal direction of the bracket as it goes downward. The upper inclined portion 5b and the left lower inclined portion 3b are connected to each other, and the right upper inclined portion 5b and the right lower inclined portion 3b are connected to each other. More specifically, each of the supporting rubber elastic bodies 7 and 7 connects the left upper reinforcing portion 37 and the left lower reinforcing portion 35 to each other, and the right upper reinforcing portion 37 and the right lower reinforcing portion 35 connected to each other. is doing. In other words, the upper ends of the support rubber elastic bodies 7, 7 are vulcanized and bonded to the upper reinforcing portions 37, 37 of the upper mounting bracket 5, and the lower ends of the supporting rubber elastic bodies 7, 7 are lower reinforcement of the lower mounting bracket 3. The parts 35 and 35 are vulcanized and bonded. Each of the supporting rubber elastic bodies 7 and 7 is inclined by approximately 30 degrees, and the ratio of the spring characteristics between the vertical direction and the metal fitting longitudinal direction is set to approximately 2: 1.

  Here, in the conventional vibration isolator, by adjusting the inclination angle of the upper inclined portion and the lower inclined portion, the load or vibration input from the vertical direction or the metal fitting longitudinal direction is applied to the support rubber elastic body in the compression direction. By acting as a vibration, it is possible to obtain high spring characteristics in the vertical direction and horizontal one direction, but when a load or vibration is input from the direction perpendicular to the longitudinal direction of the bracket, the angle of the support rubber elastic body is adjusted. However, since the load and vibration in the shear direction act on the support rubber elastic body, it is difficult to obtain high spring characteristics. For this reason, for example, the ratio of spring characteristics in the vertical direction, the longitudinal direction of the bracket (vehicle width direction), and the direction perpendicular to the longitudinal direction of the bracket (vehicle longitudinal direction) is approximately 2: 1: 0.625, which is When a large load is input in the direction, it is difficult to suppress the transmission of vibration to the vehicle body.

  On the other hand, as described above, the support rubber elastic bodies 7 and 7 of the present embodiment have their upper end portions sandwiched by the upper reinforcing portions 37 and 37 from the direction perpendicular to the longitudinal direction of the metal fitting and their lower end portions on the lower side. Since the reinforcements 35 and 35 restrict the movement in the metal longitudinal direction, the load and vibration in the compression direction act on the support rubber elastic bodies 7 and 7 when a load or vibration is input from the metal vertical direction. Therefore, desired high spring characteristics can be obtained.

  Further, the lower end portions of the supporting rubber elastic bodies 7 and 7 are notched by the lower reinforcing portions 35 and 35, but the upper reinforcing portions 37 and 37 are formed in an inverted U-shaped cross section, thereby supporting the elasticity of the supporting rubber. Since the rubber volume (volume of the rubber elastic body) at the center in the direction perpendicular to the longitudinal direction of the metal members 7 and 7 is secured, the deterioration of the spring characteristics in the vertical direction and the longitudinal direction of the metal fitting is suppressed. Therefore, according to the vibration isolator 1 of the present embodiment, for example, the ratio of the spring characteristics in the vertical direction, the vehicle width direction, and the vehicle longitudinal direction can be set to approximately 2: 1: 1. Note that the spring characteristics of the vibration isolator 1 in the vertical direction or the longitudinal direction of the metal fitting are set by adjusting the inclination angles of the upper inclined portion 5b and the lower inclined portion 3b, whereas the vibration isolating device in the vertical direction of the metal fitting longitudinal direction is set. The spring characteristic of the device 1 is set, for example, by adjusting the opening angle of the reinforcing main body portion 35a formed in an inverted V-shaped cross section.

  The stopper rubber 11 has an annular shape and is integrally formed with the upper horizontal portion 5a so as to cover the inner peripheral surface and the peripheral edge of the through hole 5d as shown in FIG. The stopper rubber 11 is connected to the support rubber elastic bodies 7 and 7 in order to mold the rubber member with one injection hole formed in the molding die.

  The stopper bolt 31 passes through the annular stopper rubber 11 and the stopper rubber 11 (through hole 5d) at an interval in the radial direction. The stopper bolt 31 has a lower end inserted through a mounting hole 9 c formed in the top wall 9 a of the gantry 9 and is fixed by the nut 39.

  The stopper plate 13 is formed in an annular shape, is attached to the stopper bolt 31 above the upper horizontal portion 5a, and has an outer diameter larger than that of the through hole 5d of the upper horizontal portion 5a. . More specifically, the stopper plate 13 is placed on the upper end of a cylindrical spacer 33 placed on the top wall portion 9a of the gantry 9 so as to surround the stopper bolt 31, so that the stopper rubber 11 It is located above and is sandwiched between the upper end of the spacer 33 and the head 31 a of the stopper bolt 31. The spacer 33 penetrates the stopper rubber 11 with a predetermined interval in the radial direction between the annular stopper rubber 11. The stopper pin referred to in the present invention, which passes through the annular stopper rubber 11 at a predetermined interval in the radial direction, has a stopper plate 13 attached thereto, and is fixed to the upper end of the gantry 9 is a stopper pin. It corresponds to the bolt 31 and the spacer 33.

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

  First, the caulking bolts 15 and 15 are inserted into the bolt insertion holes 3c and 3c formed in the lower horizontal portion 3a of the lower mounting bracket 3, and the caulking bolts 15 and 15 are attached and fixed to the lower horizontal portion 3a. Next, the base 9 to which the nut 39 is welded is disposed on the lower horizontal portion 3a of the lower mounting bracket 3 so as to straddle the caulking bolts 15 and 15, and the lower ends of the side wall portions 9b and 9b of the base 9 are The gantry 9 is attached to the lower mounting bracket 3 by welding to the lower horizontal portion 3a. Further, the lower reinforcing portions 35 and 35 are attached to the lower mounting bracket 3 by welding the flange portions 35 b and 35 b to the lower inclined portions 3 b and 3 b of the lower mounting bracket 3.

  On the other hand, the upper reinforcing portions 37, 37 are arranged on the upper inclined portions 5b, 5b of the upper mounting bracket 5 so as to form an inverted U-shaped cross section when viewed from the inclined direction of the upper inclined portions 5b, 5b. The upper reinforcing portions 37 and 37 are attached to the upper mounting bracket 5 by welding the top wall portions 37a and 37a to the upper inclined portions 5b and 5b.

  Then, a molding die that opens and closes in the same direction as the bracket longitudinal direction of the lower mounting bracket 3 is prepared, and the upper horizontal portion 5a of the upper mounting bracket 5 is spaced from the top wall portion 9a of the gantry 9 by a predetermined distance. The lower mounting bracket 3 faces the lower horizontal portion 3a, and the pair of upper inclined portions 5b, 5b of the upper mounting bracket 5 faces the pair of lower inclined portions 3b, 3b of the lower mounting bracket 3. Due to the positional relationship, both 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 and 7 and a stopper rubber 11, and these rubber members include the lower reinforcement portions 35 and 35, the upper reinforcement portions 37 and 37, and the upper horizontal portion. 5a is vulcanized and integrated.

  Thereafter, the molding die is opened, and as shown in FIG. 7, the lower mounting bracket 3, the upper mounting bracket 5, the pair of support rubber elastic bodies 7 and 7, and the stopper rubber 11 are integrally vulcanized and molded. Take out the product.

  Next, the spacer 33 is inserted into the through hole 5d of the upper horizontal portion 5a, and the lower end of the spacer 33 is brought into contact with the peripheral portion of the mounting hole 9c formed in the mount 9. Then, with the stopper plate 13 placed on the upper end of the spacer 33, the stopper bolt 31 is inserted into the stopper plate 13 and the spacer 33 from above, and the lower end thereof is tightened with the nut 39, so that the stopper bolt 31 and the spacer 33 (stopper pin) and the stopper plate 13 are fixed to the gantry 9.

-Mounting state of the vibration isolator to the vehicle body and transmission-
FIG. 8 is a side view schematically showing an attachment state of the vibration isolator to the transmission. Reference numeral 23 in FIG. 8 indicates an engine, reference numeral 25 indicates a manual transmission, and reference numeral 27 indicates a cross member of the vehicle. This vehicle is a four-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 25.

  The manual transmission 25 receives a large load in the vertical direction and the vehicle width direction in relation to its arrangement, weight, number of support points, output, and the like. For this reason, the vibration isolator 1 is attached to the cross member 27 and the manual transmission 25 so that the metal fitting longitudinal direction substantially coincides with the vehicle width direction.

  Specifically, in the vibration isolator 1, the lower horizontal portion 3a of the lower mounting bracket 3 is placed on the upper surface of the cross member 27 and is inserted into the bolt insertion holes 3c and 3c of the lower horizontal 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 into the bolt insertion holes 5e and 5e formed in the inclined portions 5g and 5g in a state where the inclined portions 5g and 5g of the upper mounting bracket 5 are in contact with the manual transmission 25. The bolts are attached to the manual transmission 25 by tightening them with nuts (not shown) provided on the manual transmission 25.

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

  For example, when the vibration and load input from the manual transmission 25 are small, such as after the engine 23 is started, the support rubber elastic bodies 7 and 7 mainly absorb and attenuate vibrations in the vertical direction and the vehicle width direction. This reduces vibrations from being transmitted to the vehicle 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 stopper rubber 11 which covers the peripheral part of the through-hole 5d formed in the upper horizontal part 5a abuts on the top wall part 9a of the gantry 9, and the excessive deformation of the supporting rubber elastic bodies 7 and 7 below is carried out. It can be suppressed. On the other hand, at the time of rebounding upward, the stopper rubber 11 abuts against the lower surface of the stopper plate 13, so that excessive displacement of the supporting rubber elastic bodies 7, 7 can be suppressed.

  Further, when a large load is applied to the vibration isolator 1 in the vehicle front-rear direction due to the inertial force of the manual transmission 25, for example, when the vehicle suddenly stops or suddenly starts, the lower reinforcing portions 35, 35 and the upper The support rubber elastic bodies 7 and 7 whose spring characteristics are enhanced by the reinforcing portions 37 and 37 absorb the load and are deformed in the vehicle front-rear direction (the direction perpendicular to the longitudinal direction of the metal fitting). Displace. Then, the stopper rubber 11 covering the inner peripheral surface of the through hole 5d abuts on the spacer 33 (stopper pin), and excessive deformation of the support rubber elastic bodies 7, 7 in the vehicle front-rear direction is suppressed.

  Further, when the manual transmission 25 vibrates greatly in the rolling direction with respect to the vehicle body and a load is input to the vibration isolator 1 in the vehicle width direction (metal longitudinal direction), the upper mounting bracket 5 is displaced in the vehicle width direction and penetrates. The stopper rubber 11 covering the inner peripheral surface of the hole 5d contacts the spacer 33, and deformation of the support rubber elastic bodies 7 and 7 in the vehicle width direction is suppressed.

-Effect-
According to this embodiment, the gantry 9 to which the lower end portion of the stopper bolt 31 is fixed is attached to the lower horizontal portion 3a so as to form a closed section that opens in the longitudinal direction of the metal fitting and straddles the caulking bolts 15 and 15. Therefore, even if the number of the caulking bolts 15, 15 increases or the interval between the caulking bolts 15, 15 in the metal fitting longitudinal direction increases, interference with the caulking bolts 15, 15 can be avoided. Therefore, since it is not necessary to enlarge the mount 9 in order to avoid interference with the caulking bolts 15, 15, it is possible to suppress the vibration isolator 1 from being enlarged.

  Further, the gantry 9 forms a closed cross section with the lower mounting bracket 3, and the side wall portions 9 b and 9 b extend in the longitudinal direction of the bracket and function as ribs of the lower mounting bracket 3. The rigidity of the apparatus 1 in the longitudinal direction of the metal fitting can be increased.

  Further, even when the manual transmission 25 greatly vibrates in the rolling direction relative to the vehicle body and a large load is input in the vehicle width direction, the relative vibration between the manual transmission 25 and the vehicle body is absorbed by the support rubber elastic bodies 7 and 7. Can do. Further, the support strength in the vehicle width direction can be increased by matching the longitudinal direction of the metal fitting whose rigidity is enhanced by the gantry 9 with the vehicle width direction.

  In addition, since the stopper bolt 31 and the spacer 33 pass through the through hole 5d of the upper mounting bracket 5 and the upper mounting bracket 5 is sandwiched in the vertical direction by the stopper plate 13 and the gantry 9, in the unlikely event, the supporting rubber elastic body Even when 7, 7 breaks, it is possible to suppress the manual transmission 25 from being largely inclined and falling off.

(Other embodiments)
In the above embodiment, the vibration isolator 1 is attached to the cross member 27 and the manual transmission 25 so that the longitudinal direction of the metal fitting and the vehicle width direction substantially coincide with each other. However, the present invention is not limited to this. When the manual transmission 25 set and arranged so as to increase the vibration in the front-rear direction is supported in an anti-vibration manner, the anti-vibration device 1 and the cross member 27 and You may attach to the manual transmission 25. FIG.

  Furthermore, in the said embodiment, although the vibration isolator 1 was bolted to the manual transmission 25, it is not restricted to this, For example, you may bolt to an automatic transmission.

  Moreover, in the said embodiment, although the vibration isolator 1 was attached to the cross member 27, you may attach the vibration isolator 1 to another vehicle body frame member not only in this.

  Further, in the above embodiment, the stopper pin 31 and the spacer 33 constitute the stopper pin. However, the present invention is not limited to this, and for example, a large-diameter stopper bolt that has sufficient strength and is integrally formed with the stopper plate 13. If 31 is used, the spacer 33 may not be used.

  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 front view which shows the vibration isolator which concerns on this invention. It is a top view which shows a vibration isolator. It is a side view which shows a vibration isolator. It is a perspective view which shows the lower attachment bracket with which the mount frame and the lower reinforcement part were attached. It is arrow sectional drawing of the VV line of FIG. It is arrow sectional drawing of the VI-VI line of FIG. 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 typically the attachment state to the manual transmission of a vibration isolator. It is a front view which shows the conventional vibration isolator.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Anti-vibration device 3 Lower side attachment metal fitting 3a Lower side horizontal part 3b Lower inclination part 5 Upper attachment metal part 5a Upper horizontal part 5b Upper inclination part 5c Upper attachment part 5d Through-hole 7 Support rubber elastic body 9 Base 11 Stopper rubber 13 Stopper Plate 15 Caulking bolt (fastening member)
27 Cross member (car body)
25 Transmission (Transmission)
31 Stopper bolt (stopper pin)
33 Spacer (Stopper pin)

Claims (2)

A pair of lower parts, which is a long metal fitting, extending downwardly from the lower horizontal part of the lower horizontal part and extending from both ends of the lower metal part in the longitudinal direction to the outer side in the longitudinal direction of the metal part. A lower mounting bracket having an inclined portion;
An upper horizontal portion in which a through-hole extending in the vertical direction is formed at the center, and a pair of upper inclined portions extending obliquely upward from the both ends in the longitudinal direction of the metal fitting to the outside in the metal longitudinal direction An upper mounting part that extends from both ends of the upper inclined part in the longitudinal direction of the bracket and is attached to the transmission, and that is disposed opposite to the lower mounting bracket.
A pair of support rubber elastic bodies respectively connecting the upper inclined portions and the lower inclined portions;
An annular stopper rubber formed on the upper horizontal part so as to cover the inner peripheral surface and the peripheral part of the through hole;
The annular stopper rubber and a stopper pin penetrating the stopper rubber at a predetermined interval in the radial direction;
A stopper plate attached to the stopper pin above the upper horizontal portion;
Fastening members for attaching the lower horizontal part to the vehicle body, which are juxtaposed in the longitudinal direction of the metal fitting on the lower horizontal part,
It has a closed section that opens in the longitudinal direction of the metal fitting and is attached to the lower horizontal portion so as to straddle the fastening member, and has a base on which the lower end portion of the stopper pin is fixed at the upper end portion. Anti-vibration device characterized by The vibration isolator according to claim 1, wherein
The anti-vibration device according to claim 1, wherein the lower and upper mounting brackets are mounted on the vehicle body and the transmission, respectively, such that the longitudinal direction of the bracket substantially matches the vehicle width direction.

Images