JP2010090996A - Strut mount and strut mount manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To satisfy both of a low spring constant and a high loss factor at the same time, while maintaining a high static spring constant so as to manufacture a strut mount easily. <P>SOLUTION: An engagement section 46 is formed integrally with a low density section 44. The engagement section 46 is inserted in an engagement hole 36 so as to fill the engagement hole 36 of an inside mounting member 30, and connects the low density section 44 laminated on one side of the inside mounting member 30 and the low density section 44 laminated on the other surface. Since the engagement section 46 is arranged so as to fill the engagement hole 36, the low density section 44 is mounted on the inside mounting member 30. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a strut mount for mounting a shock absorber constituting a suspension mechanism of a vehicle on a vehicle body, and a method for manufacturing the strut mount.

  Some vehicles, such as automobiles, have a strut-type suspension mechanism formed of a shock absorber or the like between a wheel and a vehicle body. In the strut type sun suspension mechanism, a shock absorber is mounted on the vehicle body via a strut mount.

  Most strut mounts press-fit a rubber elastic body that is integrated with the inner metal fitting into the outer metal fitting housing, and a metal plate that prevents the dropout from being placed in the opening of the housing to prevent the inner metal fitting and rubber elastic. It is configured to prevent the body from falling off the outer fitting. In addition, an outer plate is attached to the outer periphery of the rubber elastic body and the outer plate is press-fitted into the outer metal fitting in order to firmly support the rubber elastic body integrated with the inner metal fitting to the outer metal fitting. Have been proposed to support this. In the strut mount having such a configuration, input from the road surface is input to the inner cylinder fitting attached to the inner periphery of the rubber elastic body, and external force is transmitted from the vehicle body side via the outer plate provided on the outer periphery (for example, patent References 1 and 2).

  Therefore, a large shear stress is generated in the rubber elastic body, and there is a problem in terms of durability of the rubber elastic body. In order to cope with such a problem, there has also been proposed a structure in which a stopper cushion is interposed between the rubber elastic body and the outer metal fitting to reduce the shearing force applied to the rubber elastic body (for example, Patent Document 1). 2).

  By the way, the rubber elastic body used for such a strut mount is usually desired to have a high spring constant for a large input. On the other hand, since it is difficult to absorb with shock absorbers and coil springs, a low dynamic spring constant and a high loss factor are required to absorb these vibrations and improve riding comfort. Is done. Therefore, in order to achieve both a low spring constant and a high loss coefficient at the same time while maintaining a high static spring constant, the strut mount described in Patent Document 3 has a loss coefficient higher than that of the rubber elastic body outside the rubber elastic body. In addition, a low density soft layer is laminated.

According to the invention described in Patent Document 3, a low spring constant and a high loss factor can be simultaneously achieved while maintaining a high static spring constant. However, since the rubber elastic body and the soft layer are different materials and usually have different adhesives, it is not easy to join them together and press-fit them into the outer metal fitting.
JP 2001-65626 A JP 2001-82530 A Japanese Patent Laid-Open No. 2007-1000088

  The present invention has been made in consideration of the above facts, and while maintaining a high static spring constant, a strut mount capable of simultaneously producing a low spring constant and a high loss factor and easily manufactured, And it aims at providing the manufacturing method of a strut mount.

  In order to achieve the above object, a strut mount according to claim 1 of the present invention is attached coaxially to a piston rod of a shock absorber and has an inner mounting member having a radially projecting portion, and is attached to a vehicle body. An outer member having a storage space in which at least the projecting portion of the inner mounting member is disposed on the inner side, and an adhesive member bonded to the inner mounting member and press-fitted into the storage space. An elastic body having a low-density portion with a high loss factor and a low density, wherein the elastic portion is bonded to the inner mounting member, and at least one of the projecting portion and the elastic portion is provided with the piston rod. A locking hole is formed along the axial direction, and the low-density portion has a locking portion that fills the locking hole that is integrally formed, and a main body portion that is disposed so as to cover the locking hole. The axial end of the low-density portion is characterized by, disposed on the outer side than the elastic portion.

  In this strut mount, the elastic body bonded to the inner mounting member is press-fitted into the storage space inside the outer member. The elastic body has a low density portion having a low loss density and a higher loss coefficient than the elastic portion and the elastic portion. In the strut mount of the present invention, the soft layer having a high loss factor and a soft and low density, low dynamic spring constant absorbs minute high frequency vibrations. On the other hand, the elastic portion is appropriately deformed and absorbed by a large external force from the shock absorber. As described above, the low-density part deforms and absorbs the vibration mainly for minute high-frequency vibrations, and the elastic part having a relatively high rigidity deforms mainly for the large external force. To absorb.

  Here, a locking hole along the axial direction of the piston rod is formed in at least one of the overhanging portion and the elastic portion, and is configured integrally with the low density portion so as to fill the locking hole. The latching part currently made is arrange | positioned. Thereby, a low density part is attached to an inner side attachment member directly or via an elastic part.

  According to the strut mount of the present invention, the low density portion can be easily attached to the inner attachment portion without using an adhesive.

  The strut mount according to claim 2 of the present invention is characterized in that the locking hole penetrates the overhanging portion.

  Thus, by setting it as the structure which penetrated the hole for latching, the latching part of a low density part can be continued in an axial direction, and a low density part can be attached more reliably.

  In the strut mount according to claim 3 of the present invention, the locking hole is formed in the overhanging portion, and the low density portion is disposed at a position where at least a part thereof contacts the overhanging portion, It is characterized by.

  Thus, it is not necessary to provide a locking hole in the elastic portion by arranging the low density portion in a position in contact with the overhanging portion and attaching the low density portion using the locking hole of the overhanging portion. The low-density part can be easily attached.

  A strut mount according to a fourth aspect of the present invention is characterized in that the elastic portion and the low-density portion are arranged so as to be parallel in the radial direction from the center of the protruding portion.

  Thus, by arranging the elastic part and the low density part, both the elastic part and the low density part can be directly attached to the overhanging part.

  A strut mount according to a fifth aspect of the present invention is characterized in that the elastic portion has an uneven shape having an amplitude in the axial direction of the piston rod.

  By making the elastic body have such an uneven shape, the spring constant can be easily tuned by changing the size and shape of the unevenness.

  A strut mount manufacturing method according to a sixth aspect is the strut mount manufacturing method according to any one of the first to fifth aspects, wherein the elastic portion is added to the projecting portion of the inner mounting member. And forming the low-density portion at a temperature lower than the vulcanization temperature of the elastic portion on the inner mounting member on which the elastic portion is formed, and the inner mounting member on which the low-density portion is formed, The outer member is press-fitted.

  In the strut mount manufacturing method of the present invention, first, an elastic portion is vulcanized and formed on the protruding portion of the inner mounting member. Then, the low density member is vulcanized at a temperature lower than the vulcanization temperature of the elastic portion. Thereby, the engaging part of the low density part can be caused to flow into the engaging hole formed in at least one of the overhang part and the elastic part, and the low density part can be easily attached to the inner mounting member.

  As described above, according to the present invention, it is possible to easily manufacture a strut mount that can simultaneously achieve a low spring constant and a high loss factor while maintaining a high static spring constant.

[First Embodiment]

  Hereinafter, a strut mount according to a first embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 shows a strut mount 10 according to a first embodiment of the present invention. The strut mount 10 is used as an upper mount for connecting a shock absorber constituting a part of a strut type suspension mechanism to a vehicle body of an automobile. The shock absorber includes a cylinder portion having a built-in piston and a piston rod 2 that is connected to the piston and protrudes outward from the cylinder portion. A coil spring 3 is fitted on the outer periphery of the piston rod 2. The axial direction of the piston rod 2 is S.

  A strut mount 10 is attached via a bolt 4 to a fender apron or the like of the vehicle body. The piston rod 2 is connected to the strut mount 10, whereby a shock absorber constituting a part of the suspension mechanism is attached to the vehicle body via the strut mount 10.

  The strut mount 10 includes an outer member 20, an inner mounting member 30, and an elastic body 40.

  As shown in FIG. 2, the inner mounting member 30 has a disk shape, and an insertion through hole 32 is formed in the center. On the radially outer side of the insertion through hole 32 of the inner mounting member 30, a recess 34 having a larger diameter than the insertion through hole 32 is formed coaxially with the insertion through hole 32. A plurality of engagement holes 36 (12 in FIG. 2) are formed on the radially outer side of the recess 34. The engagement hole 36 is a through-hole penetrating the front and back of the inner mounting member 30. A region for adhering a rubber elastic portion 42 to be described later is secured on the outer side in the radial direction from the engagement hole 36.

  As shown in FIG. 1, the tip of the piston rod 2 of the shock absorber is inserted through the insertion through hole 32. Therefore, the inner attachment member 30 is disposed so as to project in the radial direction of the piston rod 2. A male screw portion 2A is formed at the tip of the piston rod 2, and the nut 5 is screwed into the male screw portion 2A protruding from the insertion through hole 32, whereby the piston rod 2 is connected to the inner mounting member 30. Yes. The inner mounting member 30 is connected so as to be coaxial with the axial direction S of the piston rod 2.

  An elastic body 40 is bonded to the inner mounting member 30. The elastic body 40 is disposed so as to sandwich the inner mounting member 30 and surround the outer periphery. The elastic body 40 includes a rubber elastic portion 42 and a low density portion 44.

  As shown in FIG. 3, the rubber elastic portion 42 is disposed and vulcanized and bonded so as to sandwich and cover the outer peripheral end of the inner mounting member 30 on the outer peripheral side of the engagement hole 36 of the inner mounting member 30. The rubber elastic portion 42 has an upper surface and a lower surface formed in a waveform having an amplitude in the axial direction S. The waveform here has a shape in which irregularities are continuously formed in the circumferential direction around the axis S. This concave portion is a rubber concave portion 42A, and the convex portion is a rubber convex portion 42B. The rubber elastic portion 42 can be made of a material having a rubber hardness of about 40 ° to 80 °, such as NR, NR / BR, SBR, NR / SBR, EPDM, IIR, and CR. The spring constant of the rubber elastic portion 42 can be adjusted by settings such as rubber hardness and the height and size of the irregularities formed on the upper and lower surfaces.

  As shown in FIG. 4, the low density portion 44 is in contact with the inner mounting member 30 so as to cover the engagement hole 36 on the radially inner side, and is formed on the upper and lower surfaces of the rubber elastic portion 42 on the radially outer side. 42A is disposed so as to cover the radially outer end face of the rubber elastic portion 42. In the low density portion 44, a portion corresponding to the rubber concave portion 42A of the rubber elastic portion 42 is a low convex portion 44B convex outward in the axis S direction, and a portion corresponding to the rubber convex portion 42B is concave low in the axis S direction. The upper surface and the lower surface are formed in a waveform having an amplitude in the axial direction S. The apex of the low convex portion 44B is disposed further outside in the axial direction S than the apex of the rubber convex portion 42B. From the low concave portion 44A of the low convex portion 44B, the rubber convex portion 42B of the rubber convex portion 42B is exposed.

When the elastic body 40 is press-fitted into a storage space 26, which will be described later, in the outer member 20, the apex of the low convex portion 44B of the low density portion 44 contacts the upper plate 24 and the bottom portion 22C of the outer member 20, which will be described later. The apex of the rubber convex portion 42B of the rubber elastic portion 42 is set so as not to contact. The low density portion 44 is made of a material having a higher loss coefficient than the rubber elastic portion 42 and a low density, and is softer than the rubber elastic body 42 (a rubber hardness smaller than 40 ° to 80 °), for example, foaming. Urethane or soft rubber (including foamed rubber) can be used.
In addition, as a density in the case of using urethane foam for the low density portion 44,
Can be ^{0.8g / cm 3 ~0.03g / cm 3} , it is preferable that the 0.5 g / cm ³ order. Moreover, as a density in the case of using rubber for the low density portion 44,
Can be ^{1.05g / cm 3 ~1.3g / cm 3} , it is preferable that the 1.18 g / cm ³ order.
The low-density member can be volume-compressed. In particular, when used in combination with the rubber member (adjacent to the rubber member), the rubber member deforms the low-density member toward the low-density member side. I can escape. Therefore, as described above, the rubber elastic body 42 and the low density portion 44 are brought into contact with each other in the form of a waveform, so that the rubber elastic body 42 can escape in multiple directions upon deformation due to vibration input.

  As shown in FIG. 1, the engaging portion 46 is formed integrally with the low density portion 44. The engagement portion 46 is inserted into the engagement hole 36 so as to fill the engagement hole 36 of the inner attachment member 30, and is laminated on the other surface with the low density portion 44 laminated on one surface of the inner attachment member 30. The low density portion 44 is connected. The low density portion 44 is attached to the inner attachment member 30 by arranging the engagement portion 46 so as to fill the engagement hole 36.

  The outer member 20 is disposed coaxially with the inner mounting member 30 and is connected to the vehicle body via the bolt 4. The outer member 20 includes an outer cylinder fitting 22 and an upper plate 24. The outer cylinder fitting 22 is composed of a cylindrical part 22A having a bottom and a flange part 22B. The cylinder portion 22A is formed in a substantially cylindrical shape. A hole 22D having a larger diameter than the piston rod 2 is formed in the bottom portion 22C of the cylindrical portion 22A. A storage space 26 is formed in the cylindrical portion 22A. The upper part of the storage space 26 is opened, and the flange portion 22B extends radially outward from the upper end of the cylindrical portion 22A.

  The upper plate 24 is formed in a substantially disc shape, and a hole 24A through which the tip of the piston rod 2 is inserted is formed at the center. The upper plate 24 is disposed so as to close the open side of the storage space 26 of the outer cylindrical fitting 22.

  The elastic body 40 is press-fitted into the storage space 26. The elastic body 40 is sandwiched between the bottom portion 22C and the upper plate 24 in a pre-compressed state in the axial direction S, and the low density portion 44 is in contact with the bottom portion 22C and the upper plate 24 while being pressed. . On the other hand, the vertex of the rubber convex portion 42B of the rubber elastic portion 42 is separated from the bottom portion 22C and the upper plate 24. The inner mounting member 30 is disposed in the storage space 26.

  After the elastic body 40 is press-fitted into the storage space 26, the upper plate 24 is fixed to the flange portion 22B by spot welding at appropriate fixing means, for example, a plurality of locations around its periphery. The movement of the elastic body 40 in the axis S direction is restricted by the upper plate 24 and the bottom portion 22C.

  Insertion holes 22H and 24H are formed in the outer peripheral portions of the flange portion 22B and the upper plate 24, respectively, and the outer member 20 is connected to the vehicle body by inserting the bolt 4 into the insertion holes 22H and 24H. .

  Here, as described above, the elastic body 40 is sandwiched between the bottom portion 22C and the upper plate 24 in a state of being pre-compressed in the axial direction S, and therefore, the low-density portion 44 in the uncompressed state in the axial direction S. The length is expected to be longer than the length press-fitted into the storage space 26. The pre-compression amount of the upper and lower low-density portions 44 is set according to the use conditions of the strut mount 10, the hardness of the rubber elastic portion 42, the spring constant of the low-density portion 44, and the like. Even when the low density portion 44 is deformed by receiving an external force from 2, it is preferable to set the pre-compression amount so that no gap is generated between the low density portion 44 and the outer member 20.

  As shown in FIG. 1, the strut mount 10 has a bearing 13 attached to the lower side of the flange portion 22 </ b> B of the outer member 20. An upper end portion of the coil spring 3 that is compressed with the cylinder portion is in contact with the lower surface of the bearing 13. The upper sheet 14 is attached coaxially with the outer member 20 below the outer member 20, and the upper sheet 14 is engaged with the inner peripheral end of the hole 22D.

  Next, a method for manufacturing the strut mount 10 having the above configuration will be described.

  First, the inner mounting member 30 is prepared. The inner mounting member 30 is configured with an insertion through hole 32, a recess 34, and an engagement hole 36. Next, the rubber elastic part 42 is vulcanized and formed on the outer side of the inner mounting member 30 using a mold for the rubber elastic part 42 (see FIG. 3). The inner mounting member 30 and the rubber elastic portion 42 are bonded by vulcanization.

  Next, the low density part 44 is vulcanized and formed outside the inner mounting member 30 and the rubber elastic part 42 using a mold for the low density part 44 (see FIG. 4). Here, the vulcanization temperature of the low density portion 44 is lower than the vulcanization temperature of the rubber elastic portion 42. By this vulcanization process, the low density portion 44 flows into the engagement hole 36, the engagement portion 46 is formed, and the low density portions 44 on both sides of the inner attachment member 30 are connected by the engagement portion 46, and the inner attachment member The low density part 44 is attached to 30.

  Next, the inner mounting member 30 in which the rubber elastic portion 42 and the low density portion 44 are formed is press-fitted into the storage space 26 of the outer cylinder fitting 22 and covered with the upper plate 24.

  When the strut mount 10 is attached to the vehicle body, the flange portion 22B of the outer cylinder fitting 22 is abutted against the lower surface side of the attachment portion of the vehicle body via the upper plate 24, and in this state, the bolt 4 is attached to the flange portion from below. The nut is inserted into the insertion hole 22H of 22B, the insertion hole 24H of the upper plate 24, and the insertion hole of the vehicle body, and a nut is screwed into the tip of the bolt 4 until a predetermined fastening torque is generated. Thereby, the strut mount 10 can be fastened and fixed to the mounting portion of the vehicle body, and the shock absorber can be mounted on the vehicle body via the strut mount 10.

  According to the strut mount 10 having the above configuration, the rubber elastic portion 42 is formed by vulcanization, and the low density portion 44 is also formed by vulcanization, and the low density portion 44 is attached to the inner mounting member 30. Since the joint hole 36 is used, it is not necessary to bond the elastic body 40 to the inner mounting member 30 with an adhesive. Therefore, the manufacturing process using the adhesive can be omitted.

  In addition, since no adhesive is used, adverse effects on the spring constant of the elastic body 40 due to curing of the adhesive can be prevented.

  In addition, since the rubber elastic portion 42 and the low density portion 44 are formed by vulcanization, there is no restriction on the shape of the joint surface, and the degree of freedom in shape can be increased.

  Next, the operation of the strut mount 10 configured as described above will be described.

  In the strut mount 10 of the present embodiment, the low density portion 44 is in contact with the outer member 20 at both ends in the axial direction S. Since the low density portion 44 has a higher loss coefficient and lower density than the rubber elastic portion 42, the low density portion 44 has a higher loss coefficient and lower dynamic spring constant than the rubber elastic portion 42. Therefore, minute high-frequency vibrations that are likely to occur during high-speed traveling or the like and input from the piston rod 2 to the strut mount 10 can be effectively absorbed by the low-density portion 44 being appropriately deformed.

  On the other hand, when the input load from the piston rod 2 of the shock absorber to the strut mount 10 suddenly increases due to the vehicle overcoming a step such as a curbstone, the highly rigid rubber elastic portion 42 is appropriately deformed. The large input load can be absorbed.

  [Second Embodiment]

  Next, a second embodiment of the present invention will be described. In the present embodiment, the same parts as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  FIG. 5 shows a strut mount 50 according to the second embodiment of the present invention.

  The strut mount 10 includes an outer member 20, an inner mounting member 30, and an elastic body 40.

  As shown in FIG. 6, the inner mounting member 30 has a disk shape, and includes an insertion through hole 32 and a recess 34 similar to those in the first embodiment. A plurality of engagement holes 38 (12 in FIG. 6) are formed along the outer peripheral edge of the inner mounting member 30. The engagement hole 38 is a through hole that penetrates the front and back of the inner mounting member 30. A region for adhering a rubber elastic portion 42 to be described later is secured on the radially inner side of the engagement hole 38.

  An elastic body 60 is bonded to the inner mounting member 30. The elastic body 60 is disposed so as to sandwich the inner mounting member 30 and surround the outer periphery. The elastic body 60 includes a rubber elastic portion 62 and a low density portion 64.

  As shown in FIG. 7, the rubber elastic portion 62 is disposed on both sides of the inner mounting member 30 inside the engagement hole 38 of the inner mounting member 30 and is vulcanized and bonded. The rubber elastic portion 62 has an upper surface and a lower surface formed in a waveform having an amplitude in the axial direction S. The waveform here has a shape in which irregularities are continuously formed in the circumferential direction around the axis S. This concave portion is a rubber concave portion 62A, and the convex portion is a rubber convex portion 62B. The rubber elastic portion 62 can be made of a material such as ●● or ●● as in the first embodiment. The spring constant of the rubber elastic portion 62 can be adjusted by settings such as rubber hardness and the height and size of the irregularities formed on the upper and lower surfaces.

  As shown in FIG. 8, the low density portion 64 is disposed so as to contact the inner mounting member 30 so as to cover the engagement hole 38 on the outer side in the radial direction and sandwich the outer peripheral end portion of the inner mounting member 30. The low density portion 64 has a corrugated shape having an amplitude in the direction of the axis S. The apex of the low convex portion 64B of the low density portion 64 is disposed further outside in the axial direction S than the apex of the rubber convex portion 62B.

When the elastic body 60 is press-fitted into a storage space 26, which will be described later, in the outer member 20, the apexes of the low convex portions 64B of the low density portion 64 abut on the upper plate 24 and the bottom portion 22C of the outer member 20, which will be described later. The apex of the rubber convex portion 62B of the rubber elastic portion 62 is set so as not to contact. As the low density part 64, a low density material having a higher loss coefficient than the rubber elastic part 62, for example, foaming urethane or soft rubber can be used.

  As shown in FIG. 5, the engaging portion 66 is formed integrally with the low density portion 64. The engaging portion 66 is inserted into the engaging hole 38 so as to fill the engaging hole 38 of the inner mounting member 30, and is stacked on the other surface with the low density portion 64 stacked on one surface of the inner mounting member 30. The low density part 64 which is connected is connected. The low density portion 64 is attached to the inner attachment member 30 by the engagement portion 66 being disposed so as to fill the engagement hole 38.

  The elastic body 60 is press-fitted into the storage space 26. The elastic body 60 is sandwiched between the bottom portion 22C and the upper plate 24 in a pre-compressed state in the axial direction S, and the low density portion 64 is in contact with the bottom portion 22C and the upper plate 24 in a pressed state. . On the other hand, the apex of the rubber convex portion 62B of the rubber elastic portion 62 is separated from the bottom portion 22C and the upper plate 24. The inner mounting member 30 is disposed in the storage space 26.

  After the elastic body 60 is press-fitted into the storage space 26, the upper plate 24 is fixed to the flange portion 22B by spot welding at appropriate fixing means, for example, a plurality of locations around its periphery. The movement of the elastic body 60 in the axis S direction is restricted by the upper plate 24 and the bottom portion 22C.

  Similar to the elastic body 40, the elastic body 60 is also sandwiched between the bottom portion 22C and the upper plate 24 in a pre-compressed state. The pre-compression amount of the upper and lower low density portions 64 is set according to the use conditions of the strut mount 50, the hardness of the rubber elastic portion 62, the spring constant of the low density portion 64, and the like.

  Next, a method for manufacturing the strut mount 50 having the above configuration will be described.

  First, the inner mounting member 30 is prepared. The inner mounting member 30 is configured with an insertion through hole 32, a recess 34, and an engagement hole 38. Next, the rubber elastic part 62 is vulcanized and formed on the outer side of the inner mounting member 30 using a mold for the rubber elastic part 62 (see FIG. 7). The inner mounting member 30 and the rubber elastic portion 62 are bonded by vulcanization.

  Next, the low density portion 64 is vulcanized and formed outside the inner mounting member 30 and the rubber elastic portion 62 using a mold for the low density portion 64 (see FIG. 8). Here, the vulcanization temperature of the low density portion 64 is lower than the vulcanization temperature of the rubber elastic portion 62. By this vulcanization process, the low density portion 64 flows into the engagement hole 38, the engagement portion 66 is formed, and the low density portions 64 on both sides of the inner attachment member 30 are connected by the engagement portion 46, and the inner attachment member The low density part 64 is attached to 30.

  Next, the inner mounting member 30 in which the rubber elastic portion 62 and the low density portion 64 are formed is press-fitted into the storage space 26 of the outer cylinder fitting 22 and covered with the upper plate 24.

  The strut mount 10 is attached to the vehicle body as in the first embodiment.

  Also in the strut mount 50 configured as described above, the rubber elastic portion 62 is formed by vulcanization, and the low density portion 64 is also formed by vulcanization, and the attachment of the low density portion 64 to the inner mounting member 30 can be performed using the engagement holes. Therefore, it is not necessary to bond the elastic body 60 to the inner mounting member 30 with an adhesive. Therefore, the manufacturing process using the adhesive can be omitted.

  In addition, since no adhesive is used, adverse effects on the spring constant of the elastic body 60 due to curing of the adhesive can be prevented.

  Moreover, since the rubber elastic part 62 and the low density part 64 are formed by a vulcanization process, there is no restriction on the shape of the joint surface, and the degree of freedom in shape can be increased.

  In the first and second embodiments described above, the engagement holes 36 and 38 are through holes. However, the engagement holes 36 and 38 are not necessarily penetrated, and may be recessed portions. In this case, by vulcanizing the low density portions 44 and 64, the low density portions 44 and 64 are integrally formed with an engaging portion having a shape that engages with the concave portion.

  In the first and second embodiments, the example in which the engagement holes 36 and 38 are provided in the inner mounting member 30 has been described. However, the engagement holes are formed in the rubber elastic portion as shown in FIG. The engagement hole 39A may be used, or as shown in FIG. 10, the engagement hole 39B may be configured in both the inner mounting member 30 and the rubber elastic portion.

  Further, in the first and second embodiments, the rubber elastic portions 42 and 62 and the low density portions 44 and 64 have an uneven shape having an amplitude in the axial direction S, but the rubber elastic portions 42 and 62, the low density portion 44, 64 is not limited to such a shape, and may be a flat shape. In this case, the low density portion may be laminated on the outer side of the rubber elastic portion to cover the rubber elastic portion.

It is sectional drawing which shows the strut mount which concerns on 1st Embodiment. It is a top view of the inner side attachment member of the strut mount concerning a 1st embodiment. It is a perspective view in the state where the rubber elastic part was formed in the inner side attachment member concerning a 1st embodiment. (A) of the state which formed the rubber elastic part and the low-density part in the inner side attachment member which concerns on 1st Embodiment is a perspective view, (B) is a side view. It is sectional drawing which shows the strut mount which concerns on 2nd Embodiment. It is a top view of the inner side attachment member of the strut mount which concerns on 2nd Embodiment. It is a perspective view of the state where the rubber elastic part was formed in the inner side attachment member concerning a 2nd embodiment. (A) of the state which formed the rubber elastic part and the low-density part in the inner side attachment member which concerns on 2nd Embodiment is a perspective view, (B) is a side view. It is sectional drawing which shows the strut mount which concerns on the modification of 1st, 2nd embodiment of this invention. It is sectional drawing which shows the strut mount which concerns on the other modification of 1st, 2nd embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Strut mount 20 Outer member 22 Outer cylinder metal fitting 24 Upper plate 26 Storage space 30 Inner attachment member 32 Insertion through-hole 36 Engagement hole 38 Engagement hole 39B Engagement hole 39B Engagement hole 40 Elastic body 42 Rubber elastic part 44 Low Density part 46 Engagement part 50 Strut mount 60 Elastic body 62 Rubber elastic part 64 Low density part 66 Engagement part

Claims (6)

An inner mounting member that is coaxially mounted on the piston rod of the shock absorber and has a projecting portion projecting in the radial direction;
An outer member that is attached to the vehicle body and that has a storage space in which at least the protruding portion of the inner mounting member is disposed;
An elastic body that is bonded to the inner mounting member and press-fitted into the storage space, and has an elastic part and a low-density part having a low loss coefficient and a lower density than the elastic part;
With
The elastic part is bonded to the inner mounting member, and at least one of the projecting part and the elastic part is formed with a locking hole along the axial direction of the piston rod, and the low-density part is integrally formed. A locking portion that fills the locking hole and a body portion that is disposed so as to cover the locking hole, and the axial end of the low density portion is disposed outside the elastic portion. A strut mount characterized by that.   The strut mount according to claim 1, wherein the locking hole passes through the protruding portion.   3. The locking hole is formed in the overhanging portion, and the low density portion is disposed at a position where at least a part of the low density portion is in contact with the overhanging portion. The described strut mount.   The said elastic part and the said low-density part are arrange | positioned so that it may be parallel to radial direction from the center of the said overhang | projection part, The Claim 1 characterized by the above-mentioned. Strut mount.   The strut mount according to any one of claims 1 to 4, wherein the elastic portion has an uneven shape having an amplitude in the axial direction of the piston rod. It is a manufacturing method of the strut mount according to any one of claims 1 to 5,
The elastic part is vulcanized and formed on the overhanging part of the inner mounting member,
The low-density portion is vulcanized and formed at a temperature lower than the vulcanization temperature of the elastic portion on the inner mounting member on which the elastic portion is formed,
The strut mount manufacturing method of press-fitting the inner attachment member having the low density portion formed into the outer member.

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