JPH09112633A - Silencer hanger rubber - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a silencer hanger rubber which ensures enhancement of the durability, facilitates manufacture, and makes it possible to perform independent tuning of the static spring characteristics and dynamic spring characteristics without embedding a mass. SOLUTION: A body 1 and a pair of arms 2, 2 are formed through a vulcanized molding process of rubber. The body part is provided with a central cavity spreading to the left and right in the middle position of a rubber block over its height and is composed of an upper mounting part 11 having the first mounting hole 13 to admit insertion of a supporting member 16 from the car body, a lower mounting part 12 having the second mounting hole 14 to admit insertion of a supporting member 17 from a silencer S, and main springs 15, 15 in the form of circular arc which are located on both sides. The roots 21 of the arms are located over the main springs, and the protruding ends 22 are left protrusive outward aslant to the left and right in inclination to the normal to each main spring. The protruding end of each arm is vibrated with deformation of the main spring associate with the vibratory input in the vertical direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a silencer hanger rubber used for elastically supporting a silencer for reducing exhaust noise of an automobile on a vehicle body for vibration isolation.

[0002]

2. Description of the Related Art Conventionally, as this type of silencer hanger rubber, a first mounting portion having a first mounting hole into which a mounting member from the vehicle body side is inserted, and a second mounting member from which the mounting member from the silencer side is inserted. A second mounting portion having a mounting hole, a pair of side portions as main spring portions extending between both sides of the first mounting portion and the second mounting portion and connecting the both, and the pair of side portions. There is known a so-called θ type one in which a central connecting portion that laterally connects the central portions of the above is integrally formed of a rubber material (for example, Japanese Patent Laid-Open No. Hei 3 (1999) -311).
-66953 gazette).

Further, instead of the central connecting portion, the first attaching portion and the second attaching portion are vertically connected to each other to provide a central main spring portion, and a mass is interposed in the middle of the central main spring portion. Some are known (see, for example, Japanese Utility Model Laid-Open No. 59-186574).

[0004]

However, it is extremely difficult to tune the static spring characteristic and the dynamic spring characteristic independently of each other in the above-mentioned θ type among the above-mentioned conventional silencer hanger rubbers. However, there is an inconvenience that the applicable range is limited to an extremely narrow range. That is, since the θ type is configured such that the central connecting portion suppresses the displacement of the pair of side portions opening and closing sideways relative to each other when a load is applied. , If the central connecting part is made thinner to change the dynamic spring characteristics to a higher frequency side, the static spring characteristics will change to softer accordingly, while conversely if the central connecting part is made thicker, the static spring The characteristics also change to hard ones.

Further, in the case where the above mass is provided,
By adjusting the mass, it is possible to tune the dynamic spring characteristic separately from the static spring characteristic, but this brings about a disadvantage that durability is deteriorated and the total weight and manufacturing cost are increased. is there. That is, when a mass is added to the central main spring part, the entire length of the rubber part of the central main spring part is shortened by the added mass, and the amount of displacement shortened by the same amount as when there is no mass. Since it is handled by the part, the strain rate of the rubber is increased as compared with the case without the mass. Therefore, the durability of the central main spring portion may be deteriorated due to repeated expansion and contraction of a large strain rate. Further, since the mass is embedded in the middle of the central main spring portion, it takes time and labor to manufacture the mass, and the manufacturing cost increases as the man-hour increases.

Further, in the case where the above-mentioned mass is added, it is almost impossible to change the mass by reducing or increasing the mass in order to change the dynamic spring characteristic after manufacturing.

The present invention has been made in view of the above circumstances, and an object thereof is to improve the durability while allowing the static spring characteristic and the dynamic spring characteristic to be tuned independently of each other. It is intended to facilitate manufacturing.

[0008]

In order to achieve the above object, the invention according to claim 1 is arranged between a vehicle body and a silencer, and a support member is inserted from the vehicle body side. A first mounting portion having a first mounting hole, a second mounting portion having a second mounting hole into which a support member from the silencer side is inserted, and extending between the first mounting portion and the second mounting portion. It is premised that the main spring portion that connects the two to each other is integrally formed of a rubber material, and elastically supports the silencer with respect to the vehicle body. In this structure, a part of the main body portion including the first mounting portion, the second mounting portion, and the main spring portion is projected in a direction different from the direction connecting the first mounting hole and the second mounting hole, The protruding end is provided with an arm portion that constitutes a free end that vibrates in response to a vibration input in a direction connecting the first mounting hole and the second mounting hole. Then, the arm portion is formed integrally with the main body portion from a rubber material.

In the case of the above configuration, when vibration is input in the direction connecting the first mounting portion and the second mounting portion, that is, in the vibration input direction, the free end, which is the projecting end of the arm portion, vibrates. The mass of the part acts as a mass on the main body part to damp the input vibration. On the other hand, the static spring characteristic is determined by the main spring section of the main body section, and the arm section does not affect the static spring characteristic. Therefore, by changing the arm length up to the protruding end of the arm section, the dynamic spring Even if the characteristics are tuned, the static spring characteristics are not affected. Therefore, it becomes possible to tune the static spring characteristic and the dynamic spring characteristic independently of each other. On the other hand, since the arm functioning as the mass is integrally formed with the main body by the rubber material, it can be manufactured more easily and is lighter in weight than the case where the mass is embedded separately, and is surely formed. To be done. Moreover, even after manufacturing once, it is possible to adjust the mass of the mass equivalent portion by cutting the protruding end side of the arm part or adding another mass member by means such as bonding, and the dynamic spring characteristics can be changed. This is easily possible later.

According to a second aspect of the invention, in the first aspect of the invention, the main spring portions are arranged at both side positions in a direction orthogonal to the direction connecting the first mounting hole and the second mounting hole, and respectively. It is configured by a pair of arcuate portions that are curved outward in the orthogonal direction. In addition, the arm part is provided with the first
Each arc-shaped portion is bent by a vibration input in a direction connecting the mounting portion and the second mounting portion, and the root of the arm portion receives a bending force due to a change in the curvature of each arc-shaped portion caused by the vibration. The structure is provided in a part of the arcuate portion.

In the above structure, when vibration is input in the vibration input direction, the pair of arcuate portions, which are the main spring portions, bend and the curvature thereof changes. With this change in curvature, the root of the arm portion, that is, the attachment portion of each arm portion with each arcuate portion is repeatedly stretched or compressed in the circumferential direction of each arcuate portion, and receives a bending force. This causes the arm part to vibrate. Therefore, it is possible to reliably vibrate the arm portion that has received the input vibration.

According to a third aspect of the invention, in the second aspect of the invention, the arm portion is projected outward from the outer peripheral side of each arcuate portion.

In the case of the above structure, the arm portion can be provided without being restricted by space, and the length of the arm portion can be freely set according to the dynamic spring characteristic to be tuned.

According to a fourth aspect of the present invention, in the third aspect of the invention, the arm portion is projected in an oblique direction with respect to the normal line of each arcuate portion.

In the case of the above construction, the arm portion is more likely to receive a bending force as the curvature of each arcuate portion changes, and the arm portion can be vibrated more reliably when vibration is input.

According to a fifth aspect of the present invention, in the first aspect of the invention, the arm portion is projected from either one or both of the first attachment portion and the second attachment portion.

In the case of the above configuration, when vibration is input to the first mounting portion or the second mounting portion from the support member inserted in the first or second through hole, the first mounting portion and the second mounting portion vibrate. Relative displacement in the input direction. Then, with this relative displacement, the protruding end side of the arm portion is swung and vibrates. Therefore, similarly to the second aspect of the invention, it is possible to reliably vibrate the arm portion that has received the input vibration.

According to a sixth aspect of the present invention, in the fifth aspect of the invention, the arm portion is located on the outer side with respect to the direction connecting the first attachment hole and the second attachment hole, and the end edge side of the attachment portion. Make it protrude from the site. In addition, a space is formed in the mounting portion between the arm portion and the mounting hole so as to penetrate therethrough in parallel with the mounting hole.

In the case of the above structure, when vibration is input to the first mounting hole side or the second mounting hole side, the mounting portion having a void does not have a void due to the existence of the void. It vibrates with a larger displacement. For this reason, the arm portion protruding from the end edge side portion of the mounting portion with the space therebetween is shaken more than in the case where there is no space, and a more reliable and greater vibration suppressing effect can be obtained.

According to a seventh aspect of the present invention, in the invention according to the sixth aspect, one of the facing surfaces facing each other in the direction connecting the first mounting hole and the second mounting hole in the void is provided with the above-mentioned direction. A convex portion protruding to the side is formed.

In the case of the above structure, the vibration is input and the mounting portion is displaced, whereby the void is narrowed in the vibration input direction and the convex portion in the void is pressed. For this reason,
The arm portion can vibrate more reliably with the convex portion as a fulcrum, and in addition, the arm portion vibrates in the direction opposite to the vibration input direction, and the mass of the arm portion itself functions as a counter mass.

According to an eighth aspect of the invention, in the first aspect of the invention, the main spring portion is penetrated in a range between the first mounting hole and the second mounting hole in a position separated from each other in parallel with the mounting hole. To form a plurality of vacant holes.

In the case of the above construction, the presence of the plurality of holes serves to distribute the load and suppress the surging, so that the surging frequency can be shifted to a higher frequency side. Therefore, the dynamic spring characteristics can be improved in a wide frequency range.

According to a ninth aspect of the invention, in the invention of the first aspect, a mass is added to the protruding end side of the arm portion.

In the case of the above construction, the increase in the mass of the arm portion can be adjusted without increasing the length or width of the protrusion of the arm portion.

[0026]

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

<First Embodiment> FIGS. 1 and 2 show a silencer hanger rubber according to a first embodiment of the present invention, and relate to the first to fourth aspects of the present invention. In the figure, 1 is a main body, and 2 and 2 are arms integrally formed with the main body 1. In the silencer hanger rubber, the main body 1 and the pair of arms 2 and 2 are rubber vulcanized. It is integrally formed by molding.

The main body 1 is a rubber block of a predetermined thickness having an oval shape or an elliptical shape having a long diameter arranged in the vertical direction (vertical direction in FIGS. 1 and 2), and is left and right at a substantially central position in the vertical direction. A cavity 10 extending in the direction (the left-right direction in FIGS. 1 and 2) is formed so as to penetrate therethrough. The upper part is the upper mounting part 11 as the first mounting part and the lower part is the lower mounting part 12 as the second mounting part with the space 10 sandwiched therebetween. A first mounting hole 13 and a second mounting hole 14 are formed at a substantially central position so as to penetrate in the thickness direction (direction orthogonal to the paper surface of FIG. 1). In addition, a pair of arc-shaped portions 15 and 15 are formed such that the left and right sides of the space 10 are curved outward in the left-right direction. Furthermore, the space 10 between the upper and lower mounting portions 11 and 12
Stopper portions 11a and 12a, which are protruded by a predetermined amount respectively, are formed on the mutually facing surfaces in the up-down direction sandwiching the, so that the mutually facing intervals have a predetermined dimension.
The displacement of the main body 1 on the vertical compression side is restricted to a predetermined amount by the stopper portions 11a and 12a. Therefore, in the present embodiment, the first mounting hole 13 and the second mounting hole 13
The direction connecting the mounting holes 14 is the vertical direction, and the direction orthogonal to that direction is the horizontal direction.

The roots 21 of the arms 2 are positioned on the upper side of the arcuate portions 15, that is, on the side of each arcuate portion 15 having the largest possible curvature, and the free ends from the roots 21 are positioned. The projecting ends 22 that are formed project in a direction inclined with respect to the normal line of each arcuate portion 15 and obliquely downward on both left and right sides. Each arm 2
The width and the protruding length are determined so as to have a mass capable of reducing the dynamic spring constant at the tuning frequency for vibration damping.

As shown in FIG. 2, the silencer hanger rubber having such a structure is vertically arranged between the vehicle body V and the silencer S. The supporting member 16 extending downward from the vehicle body V is inserted into the first mounting hole 13, while the supporting member 17 extending upward from the silencer S is inserted into the second mounting hole 14, whereby the silencer hanger rubber is attached. The self-weight of the silencer S acts to elastically support the silencer S with respect to the vehicle body V in a suspended state.

When vibrations from the silencer S side or the vehicle body V side are input to the mounting portions 11 and 12 via the supporting members 16 and 17, both mounting portions 11 and 1 are received.
The two are relatively displaced in the vertical direction by moving away from each other or approaching each other. For example, in FIG. 1, when one mounting portion (lower mounting portion 12 in the figure) is immovable and the other mounting portion (upper mounting portion 11) is relatively displaced upward, as shown by a dashed line, the upper mounting portion With the upward movement of 11, the curvature of each arcuate portion 15 becomes smaller than that before the movement (the state shown by the solid line). Due to this change in curvature, the root 21 of each arm 2 is pulled and bent downward. As a result, the protruding end 22 of each arm 2 is swung downward. On the contrary, when the upper mounting portion 11 is relatively moved to the lower mounting portion 12 side, that is, when the lower mounting portion 12 is relatively moved downward, the curvature of each arc-shaped portion 15 is increased and the root 21 of each arm portion 2 is On the contrary, it is bent upward and each protruding end 22 is swung upward. By repeating this, the projecting end 22 of each arm 2 vibrates, and the mass of each arm 2 acts as a mass. As a result, the dynamic spring constant can be reduced at the predetermined resonance frequency.

As described above, each arm portion 2 formed of the rubber material integrated with the main body portion 1 exerts a function as a mass without embedding or adding a separate mass member in the rubber material. Therefore, it is possible to significantly reduce the number of manufacturing steps and to facilitate the manufacturing and reduce the manufacturing cost. Moreover, since each arm portion 2 corresponding to the mass is extended from the main body portion 1 to both sides,
Compared with the case where a mass member is embedded in a conventional central main spring portion, the mass of each arm member 2 can be reduced in comparison with the mass member in order to obtain the same dynamic spring characteristics, and the weight of the silencer hanger rubber as a whole can be reduced. You can also plan.
Moreover, the dynamic spring characteristic can be changed to a desired tuning frequency range by adjusting the protruding length, width, etc. of each of the arm portions 2, and the change is mainly made in the main body portion 2 where the static spring characteristic is exhibited. Both arc-shaped parts 15, 1 which are main spring parts
It can be performed independently of step 5.

In this silencer hanger rubber, the mass of each arm portion 2 itself is reduced by cutting the protruding end 22 side of each arm portion 2 and shortening the protruding length of each arm portion 2. And with this,
The above resonance frequency can be easily changed to a higher frequency side. On the contrary, by adding a rubber piece or a mass member to the protruding end 22 side by means such as adhesion, the mass of each arm portion 2 itself can be increased, and thereby the resonance frequency can be reduced to a lower frequency. Can be easily changed to the side. Therefore, even if the dynamic spring characteristics are tuned based on the normal temperature condition and the tuning frequency shifts due to the difference between the temperature condition and the ambient temperature under the actual use condition, as described above. By adjusting the protruding length of each arm portion 2 and the like, it is possible to adapt to the actual usage conditions. For example, in a vehicle evaluation that evaluates the performance by mounting a silencer hanger rubber on an actual vehicle, if there is a difference from the initial temperature condition under the influence of the actual exhaust temperature of the mounted vehicle, or, When the tuning frequency shifts due to the softening of the rubber when the room temperature is relatively high in the tropics, or when the room temperature is relatively low in the high latitudes. In addition, by adjusting the protruding length of each of the above-mentioned arm portions 2 and the like, it is possible to meet the actual usage conditions.

<Second Embodiment> FIG. 3 shows a silencer hanger rubber according to a second embodiment of the present invention. In this second embodiment, the mutual shapes of the main body 3 and the arm portions 4 are changed to change the arms. The part 4 is made to swing more positively than that of the first embodiment.

In the figure, 30 is a void, 31 is an upper mounting portion, 32 is a lower mounting portion, and 33 and 34 are first and second mounting portions formed through the upper and lower mounting portions 31 and 32, respectively. Holes 35 and 35 are a pair of main spring portions that connect the upper and lower mounting portions 31 and 32 to each other, and these portions 30 to 3 respectively.
The main body 3 is composed of 5. The reference numeral 32a is a stopper portion projecting upward from the lower mounting portion 32 toward the space 30.

Each of the main spring portions 35 has an upper mounting portion 3
Lateral extension pieces 35a extending from the lower end of the left side portion 1 to the left and right sides, and an arc-shaped piece 35b as an arc-shaped portion extending upward from the left and right side portions of the lower mounting portion 32 while curving outward in the left-right direction.
And a root 41 of the arm portion 4 is positioned at an intersection 35c between each of the laterally extending pieces 35a and each of the arcuate pieces 35b, and projecting ends 42 project from the respective roots 41 to the left and right sides. .

In the case of the second embodiment, FIG. 3 shows a case in which vibration is input in the vertical direction from the first mounting hole 33 side or the second mounting hole 34 side, and the upper mounting portion 31 is relatively displaced upward, for example. As indicated by the one-dot chain line, the lateral extension piece 35a is pulled obliquely upward, and the arcuate piece 35b is pulled by the lateral extension piece 35a and pulled upward to extend. Along with this, at the crossing portion 35c, the upper side of the root 41 of each arm portion 4 is pulled upward by the lateral extension piece 35a, while the root 41
Since the lower side is pulled downward by the arcuate piece 35b, the root 41 of each arm portion 4 is bent and the projecting end 42 is swung downward. When the first mounting portion 31 is relatively displaced downward, each arm portion 4 is swung upward and vibrates.

Therefore, the same effect as the effect obtained by the first embodiment can be obtained, and as described above, since each arm portion 4 is actively bent and vibrates with the crossing portion 35c as a fulcrum by the vibration input, As compared with the case of the first embodiment, each arm portion 4 can be operated more reliably,
It is possible to reduce the dynamic spring constant in a lower frequency range.

<Third Embodiment> FIGS. 4 and 5 show a silencer hanger rubber according to a third embodiment of the present invention. The third embodiment relates to the invention of claims 5 to 7, and the protruding positions of the arm portions 6 and 6 with respect to the main body portion 5 are different from those of the first or second embodiment in the upper and lower portions of the main body portion 5. Is projected in the thickness direction.

In the figure, 50 is a central space, 51 is an upper mounting portion, 52 is a lower mounting portion, and 53 and 54 are first and second penetrating portions formed in the upper and lower mounting portions 51 and 52, respectively. The mounting holes 55, 55 are a pair of main spring portions that connect the upper and lower mounting portions 51, 52 to each other.
The main body portion 5 is constituted by ~ 55. Also, 51
Reference numerals a and 52a denote stopper portions that project from the two mounting portions 51 and 52 toward the central space 50, respectively, on opposite sides. That is, the main body 5 has the same basic shape as the main body 1 in the first embodiment. In addition, in the mounting portions 51 and 52 described above, the inner cavities 51a and 52a and the outer cavities 51a and 52a are sandwiched so as to sandwich the respective mounting holes 53 and 54 from the vertical direction.
b and 52b are parallel to the mounting holes 53 and 54, that is, the thickness direction of the main body portion 5 (the direction orthogonal to the paper surface of FIG.
It is formed so as to penetrate in the left-right direction of FIG.

Each of the above-mentioned voids 51a, 51b, 52a, 52
The b is formed as an arc-shaped slit surrounding the mounting holes 53 and 54, and is arranged so as to extend in the left-right direction (left-right direction in FIG. 4). Then, the outer side cavities 51b and 52b are sandwiched between the mounting holes 53 and 54, that is, the end portions 51c and 52c, which are the positions located on the outer peripheral sides of the mounting portions 51 and 52 in the vertical direction.
The convex portions 51d and 52d are located in the outer cavities 51b and 5b.
It is formed so as to protrude toward the side opposite to each other in the vertical direction toward 2b. The respective convex portions 51d and 52d are positioned at the end positions on the opposite side of the thickness direction of the main body portion 5 from the protruding direction of the respective arm portions 6 to be described later.

The pair of arm portions 6 and 6 are integrally formed with the respective edge side portions 51c and 52c,
The projecting ends 61 are formed as free ends by projecting from the respective end side portions 51c, 52c in the thickness direction of the main body portion 5 in mutually opposite sides. Then, the pair of arm portions 6 and 6
The main body 5 and the main body 5 are integrally formed by vulcanization molding of rubber.

In the case of the third embodiment, the supporting members 16, 1
When vertical vibrations are input to the upper or lower mounting portions 51, 52 via 7, the upper mounting portion 51 and the lower mounting portion 52 are repeatedly displaced so as to move away from or approach each other in the vertical direction. In this case, for example, the upper mounting portion 51
5, the portion surrounding the first through hole 53 together with the support member 16 is displaced to the upper outer space 51b side and pushes up the convex portion 51d, as indicated by the dashed line arrow in FIG. As the convex portion 51d is pushed up, the upper arm portion 6 is swung so that the protruding end 61 rotates downward with the convex portion 51d as a fulcrum. When the upper mounting portion 51 is relatively displaced downward, on the contrary, the portion surrounding the first through hole 53 is separated from the convex portion 51d, and the protruding end 51d of the arm 6 is rotated upward. Will be shaken.

The input vibration of the arm portions 6 and 6 in the direction opposite to the input vibration attenuates the input vibration, and the dynamic spring constant can be reduced in a predetermined resonance frequency range. Moreover, in this case, the presence of the projections 51d and 52d allows the arms 6 to vibrate more positively, and the action of the arms 6 as the counter mass can be more positively obtained.

In the third embodiment described above, even if the outer cavities 51b and 52b are present without the convex portions 51d and 52d, the upper or lower mounting portion 5 is not provided.
By the relative displacement of 1, 52 in the vertical direction, each arm 6
The protruding end 61 can be swung, and the action as a mass can reduce the dynamic spring constant.
In this case, due to the existence of the outer cavities 51b and 52b,
The arm portions 6 can be swung more freely.
Further, even if the outer cavities 51b and 52b are not provided, if the upper or lower mounting portions 51 and 52 are relatively displaced in the vertical direction, the protruding end 61 of each arm portion 6 is swung by the reaction thereof. It is possible to reduce the dynamic spring constant by its action as a mass.

<Fourth Embodiment> FIGS. 6 and 7 show a silencer hanger rubber according to a fourth embodiment of the present invention. The fourth embodiment relates to the invention described in claim 8, and has a large number of holes 76 in the main spring portion 75 of the main body portion 7.
76, ... are formed.

In the figure, the main body portion 7 is composed of a rubber block having a predetermined thickness in a shape that bulges in an arc shape on the upper and lower portions of an ellipse whose major axis is arranged in the vertical direction, and the upper end portion is on the upper side. The mounting portion 71, the lower side portion are the lower side mounting portion 72, and the portion between the mounting portions 71, 72 is the main spring portion 75. Then, a first mounting hole 73 through which the above-mentioned supporting member 16 (see FIG. 2) is inserted is formed through the upper mounting portion 71 in the thickness direction (direction orthogonal to the paper surface of FIGS. 6 and 7), and Second in which the support member 17 is inserted into the side attachment portion 72
The mounting hole 74 is formed so as to penetrate in the thickness direction.

Further, at an intermediate portion in the vertical direction between the first mounting hole 73 and the second mounting hole 74 of the main spring portion 75,
The large number of holes 76, 76 having a relatively small diameter are provided in the middle of the left-right direction excluding the arc-shaped portions 75a, 75a on the left and right sides.
Are formed so as to penetrate in parallel with the respective mounting holes 73, 74. These holes 76, 76, ... Are adjacent to each other.
The two holes 76, 76 are arranged in a staggered manner so that they do not overlap each other in the vertical direction, and the portion obliquely extending between the adjacent holes 76, 76 transmits the load between the upper mounting portion 71 and the lower mounting portion 72. Is responsible for one wing of the main spring portion 75.

Then, each root 81 of the pair of arm portions 8, 8
Are positioned so as to be continuous with the outer peripheral surface of the slightly upper portion of each arc-shaped portion 75a.
Reference numeral 2 is an outer side in the left-right direction and is projected in a direction obliquely inclined from the normal line of each arc-shaped portion 75a.

In the case of the fourth embodiment, in addition to the reduction of the dynamic spring constant due to the action of the arms 8, 8 as a mass as described in the first to third embodiments, the main spring 7
5 is not only a pair of arcuate portions 75a, 75a but also a main body portion 7
Of the holes 76, 76, ...
Is formed and serves to disperse the vertical load due to the vibration input, so that surging can be suppressed and the surging frequency can be shifted to a higher frequency range. As a result, the dynamic spring constant can be reduced in a wide frequency range.

<Other Embodiments> The present invention is based on the first embodiment.
The present invention is not limited to the fourth embodiment and includes various other embodiments. That is, in the first and second embodiments, the arm portions 2 and 4 are projected to the outer side in the left-right direction. However, the present invention is not limited to this. You may make it make an arm part protrude inward.

Further, in the first to fourth embodiments, each arm portion 2, 4, 6, 8 is made of only a rubber material, but another mass member should be bonded to each protruding end side thereof. Alternatively, the mass member M may be embedded in advance as shown by M in FIG.

Furthermore, in the above-described first to fourth embodiments, each arm portion 2, 4, 6, 8 is composed of a pair on the left and right sides, but the present invention is not limited to this, and for example, the fourth embodiment. In this case, as shown in FIG. 8, in addition to the upper arm portions 8 and 8, another pair of arm portions 9 and 9 may be provided on the lower side.

[0054]

EXAMPLE FIG. 9 and FIG. 10 respectively show the test results of the first embodiment and the fourth embodiment when vibration was actually applied. In FIG. 9, a change in absolute spring constant with respect to frequency is shown by a solid line, and a change in phase is shown by a broken line. Further, in FIG. 10, a change in absolute spring constant with respect to frequency in the fourth embodiment is shown by a solid line, and as a comparative example, change in absolute spring constant with respect to frequency in a conventional θ type is shown by a broken line.

According to this, in the case of the first embodiment of FIG. 9, a bottoming portion (reducing portion) of the dynamic spring constant occurs in the frequency range of 200 to 250 Hz, and this bottoming portion is the length of the arm portion 2. The shorter the value, the higher the frequency, and the longer the length of the arm section 2, the lower the frequency.

Further, in the case of the fourth embodiment of FIG. 10 and the comparative example, in the comparative example, the bottoming portion of the dynamic spring constant is 3
In contrast to the fact that it occurs 50 Hz before and increases toward the high frequency side, in the fourth embodiment, the bottoming portion of the dynamic spring constant was obtained in a wide frequency range of approximately 350 to 650 Hz. Therefore, in the effect of reducing the dynamic spring constant, the fourth embodiment can be obtained in a wider frequency range as compared with the comparative example, and the degree of the reduction is shown by the dashed line in FIG. I was able to get the one in the area.

[0057]

As described above, according to the silencer hanger rubber of the first aspect of the present invention, the mass of the arm portion can act as a mass on the main body portion to reduce the dynamic spring constant. be able to. The dynamic spring characteristic can be changed by adjusting the length of the arm portion, and the static spring characteristic determined by the main body portion and the dynamic spring characteristic determined by the arm portion can be tuned independently of each other. Moreover, since the arm portion functioning as a mass is formed integrally with the main body by the rubber material, the manufacturing can be facilitated and the weight can be reduced as compared with the case where the mass is embedded separately. In addition, even after manufacturing once, the dynamic spring characteristics can be easily changed by adjusting the length by cutting the arm portion or the like.

According to the second aspect of the invention, in addition to the effect of the first aspect of the invention, a bending force can be applied to the root of the arm portion due to the change in the curvature accompanying the bending of the arcuate portion,
Thereby, the arm portion can be vibrated with certainty.

According to the third aspect of the invention, in addition to the effect of the second aspect of the invention, the arm portion can be provided without being restricted by space, and the arm can be tuned according to the dynamic spring characteristic to be tuned. The length of the section can be set freely.

According to the invention of claim 4, in addition to the effect of the invention of claim 3, the arm portion is more likely to receive a bending force, so that the arm portion can be vibrated more reliably at the time of vibration input.

According to the fifth aspect of the invention, in addition to the effect of the first aspect of the invention, as in the second aspect of the invention, the arm portion can be reliably vibrated in accordance with the vibration input.

According to the invention described in claim 6, in addition to the effect of the invention described in claim 5, the presence of the void allows the arm portion to be displaced and vibrated to a greater extent than in the case without the void. Therefore, it is possible to more reliably obtain a greater vibration suppressing effect.

According to the invention of claim 7, in addition to the effect of the invention of claim 6, it is possible to vibrate the arm portion more reliably with the convex portion as a fulcrum.

According to the invention of claim 8, in addition to the effect of the invention of claim 1, surging can be suppressed by the presence of a plurality of holes, and the dynamic spring characteristic is improved in a wide frequency range. be able to.

According to the invention of claim 9, in addition to the effect of the invention of claim 1, when the mass of the arm part is increased, the protruding length of the arm part is lengthened or the arm part is thickened. It is possible to easily increase the mass of the arm portion without causing any trouble. In particular, in the case where the dynamic spring characteristics are changed and adjusted by increasing the mass of the arm part after manufacturing once, the change and adjustment of the dynamic spring characteristics to the low frequency side can be easily performed by adding a mass member by means such as bonding. it can.

[Brief description of the drawings]

FIG. 1 is a front view showing a first embodiment of the present invention.

FIG. 2 is a perspective view showing a usage state of the thing of FIG.

FIG. 3 is a view corresponding to FIG. 1 showing a second embodiment.

FIG. 4 is a view corresponding to FIG. 1 showing a third embodiment.

FIG. 5 is a sectional view taken along line AA of FIG.

FIG. 6 is a view corresponding to FIG. 1 showing a fourth embodiment.

7 is a central cross-sectional view of FIG.

FIG. 8 is a view corresponding to FIG. 1 showing another embodiment.

FIG. 9 is a relationship diagram of a frequency, an absolute spring constant, and a phase in the first embodiment.

FIG. 10 is a relationship diagram between a frequency and an absolute spring constant in the fourth embodiment and a comparative example.

[Explanation of symbols]

1, 3, 5, 7 Main body part 2, 4, 6, 8, 9 Arm part 11, 31, 51, 71 Upper mounting part (first mounting part) 12, 32, 52, 72 Lower mounting part (second Mounting part) 13, 33, 53, 73 First mounting hole 14, 34, 54, 74 Second mounting hole 15, 55, 75a Arc-shaped part (main spring part) 16, 17 Support member 21, 41, 81 Root 22, 42, 61, 82 Protruding end 35b of arm portion 35b Arc-shaped piece (arc-shaped portion) 35, 75 Main spring portion 51b, 52b Outer space (cavity) 51c, 52c End edge portion 51d, 52d of mounting portion Convex part 75 Main spring part 76 Hole S Silencer V Body

Claims (9)

[Claims] 1. A first member, which is arranged between a vehicle body and a silencer, into which a support member from the vehicle body side is inserted.
A first mounting portion having a mounting hole, and a second mounting portion having a second mounting hole into which a support member from the silencer side is inserted,
A silencer hanger rubber, wherein a main spring portion extending between the first attachment portion and the second attachment portion and connecting the first attachment portion and the second attachment portion is integrally formed of a rubber material and elastically supporting the silencer with respect to a vehicle body. A part of the main body portion including the first mounting portion, the second mounting portion, and the main spring portion is projected in a direction different from the direction connecting the first mounting hole and the second mounting hole, and the projecting end thereof is First
The arm section is provided with a free end that vibrates in response to a vibration input in a direction connecting the mounting hole and the second mounting hole, and the arm section is integrally formed of a rubber material with the main body section. Silencer hanger rubber featuring. 2. The main spring portion according to claim 1, wherein the main spring portions are arranged at both side positions in a direction orthogonal to a direction connecting the first mounting hole and the second mounting hole, and are curved outward in the respective orthogonal directions. The arm portion is bent by the vibration input in the direction connecting the first attachment portion and the second attachment portion, and the curvature of each of the arc portions is increased. The silencer hanger rubber is provided in a part of each of the arcuate portions so that the root of the arm portion receives a bending force due to the change of 3. The silencer hanger rubber according to claim 2, wherein the arm portion projects outward from the outer peripheral side of each arcuate portion. 4. The silencer hanger rubber according to claim 3, wherein the arm portion projects obliquely with respect to a normal line of each arcuate portion. 5. The silencer hanger rubber according to claim 1, wherein the arm portion projects from either or both of the first attachment portion and the second attachment portion. 6. The arm portion according to claim 5, wherein the arm portion is projected from an end edge side portion of the mounting portion, which is located on an outer side with respect to a direction connecting the first mounting hole and the second mounting hole, A silencer hanger rubber, characterized in that a space is formed in a mounting portion between the mounting hole and the mounting hole in parallel therewith. 7. The protrusion according to claim 6, wherein a convex portion protruding in the above-mentioned direction is formed on either one of the facing surfaces facing each other in the direction connecting the first mounting hole and the second mounting hole in the void. Silencer hanger rubber that is characterized by. 8. The range between the first mounting hole and the second mounting hole of the main spring portion according to claim 1,
A silencer hanger rubber characterized in that a plurality of holes penetrating in parallel with the mounting holes are formed at positions distant from each other. 9. A silencer hanger rubber, wherein a mass is added to the protruding end side of the arm portion.