JP2008261487A - Strut mount - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a strut mount capable of reducing noises to be generated in a vehicle room when great vibration is input thereto. <P>SOLUTION: The strut mount comprises an inside member 1 having a pair of holding portions 14, 18 arranged opposing each other in axially spaced relation, a ring-plate outside member 2 coaxially arranged outside the inside member 1, and an annular rubber elastic body 3 fixed at its axial intermediate to the outside member 2, and held with both axial end faces being non-adhered to each other and partially put in pressure contact with each other by the pair of holding portions 14, 18. On both axial end faces of the rubber elastic body 3, a plurality of protruded portions 33 are provided which are protruded outward in the axial direction, put in pressure contact with the holding portions 14, 18, and arranged in peripherally spaced relation. On the holding portions 14, 18 at both peripheral sides of contact portions where the holding portions 14, 18 contact the protruded portions 33, first and second ribs 15, 19 are provided for changing characteristic values for the holding portions 14, 18. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a strut mount used for a strut suspension of a vehicle.

  Conventionally, a strut mount shown in FIG. 15 is known as a strut mount used when a strut suspension of a vehicle is attached to a vehicle body. The strut mount includes a cylindrical inner member 101 having a pair of holding portions 114 and 118 that are opposed to each other in the axial direction, and a ring plate outer member 102 that is coaxially disposed outside the inner member 101. An annular rubber elastic body having an axially intermediate portion fixed to the outer member 102 and sandwiched between a pair of holding portions 114 and 118 provided in the inner member 101 in a state in which both axial end surfaces are not bonded and are in pressure contact with each other. 103.

  In this strut mount, the inner member 101 is attached to the piston rod by screwing a nut (not shown) into the tip of the piston rod of a shock absorber (not shown) inserted through the shaft hole 113 of the inner member 101. At the same time, the outer member 102 is attached to a vehicle body (not shown) with a mounting bolt and used. When the vehicle travels, the vibration transmitted from the road surface through the tire is absorbed for the expansion and contraction operation of the shock absorber, and the rubber elastic body 103 absorbs the vibration that cannot be absorbed by the shock absorber. This prevents or suppresses vibrations from being transmitted to the body.

  By the way, as described in Patent Documents 1 to 4, for example, the rubber elastic body 103 of the strut mount has both axial end surfaces separated from the pair of holding portions 114 and 118 of the inner member 101. If this occurs, abnormal noise is generated due to contact when vibration is input, and therefore, a certain amount of preliminary compression is usually applied. In the case of Patent Document 1, the rubber elastic body that is pre-compressed and incorporated is shaped so as not to separate from or come into contact with the case body and the cover member (a pair of holding portions) even when vibration is input. The generation of abnormal noise is prevented without affecting the sound.

  Moreover, in the case of patent document 2, while inserting an insertion part between a rubber elastic body and an upper bracket (holding part), the insertion part and a rubber elastic body are adhere | attached, and a rubber elastic body is attached. Generation of abnormal noise is prevented by suppressing variations in the amount of preliminary compression to be applied. Further, in the case of Patent Document 3, an annular plate is bonded to both end surfaces in the axial direction of the rubber elastic body so that the rubber elastic body and the casing (holding portion) do not come into direct contact with each other. It avoids wear and prevents abnormal noise. Furthermore, in the case of Patent Document 4, the rubber elastic body is prevented from adsorbing to the regulating member by forming the contact surface of the rubber elastic body that abuts on the regulating member (holding portion) as a rough surface. In order to prevent the generation of abnormal noise.

However, when a large vibration is input to the strut mount, the holding portions 114 and 118 and the pressure contact portion of the rubber elastic body 103 are once separated or brought into contact with each other. 118 resonates. At this time, if the frequency of the generated vibration is close to the eigenvalue of the holding portions 114 and 118, the vibration amplified by the resonance of the holding portions 114 and 118 is transmitted as sound to the vehicle interior via the body frame. Noise generated in the room becomes a problem. In addition, even if the techniques disclosed in Patent Literatures 1 to 4 are applied to this problem, it is impossible to prevent amplification of vibration transmitted as sound into the vehicle interior, so that noise generated in the vehicle interior is reduced. You can hardly expect to do.
JP 2002-317849 A JP 2001-41273 A JP 2000-310281 A Japanese Patent Laid-Open No. 9-4673

  The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a strut mount capable of reducing noise generated in a vehicle compartment when a large vibration is input. .

  The present invention that solves the above-described problems includes a cylindrical inner member that is attached to the tip of a piston rod of a shock absorber, an outer member that is coaxially disposed on the outer side of the inner member and is attached to the vehicle body, and the inner side An axially intermediate portion is fixed to one of the member and the outer member, and is provided at the other member of the inner member and the outer member, and is disposed at a right angle with a distance in the axial direction. A strut mount comprising: a pair of holding portions extending in a direction; and an annular rubber elastic body sandwiched in a state in which both end surfaces in the axial direction are non-adhered and in pressure contact with each other. A plurality of projecting portions that protrude outward in the axial direction and are in pressure contact with the holding portions and arranged at a distance in the circumferential direction, and a contact area between the projecting portion and the holding portion at each axial end surface It is smaller than the area of the non-contact part, and at least one of the pair of holding parts is such that each contact part in contact with the projecting part and the holding part is sandwiched on both sides in the circumferential direction, and the eigenvalue of the holding part It is characterized in that a rib for changing the height is provided.

  In the strut mount of the present invention, at least one of the pair of holding portions provided on the inner member or the outer member is provided with each contact portion where the protruding portion provided on both end surfaces in the axial direction of the rubber elastic body and the holding portion contact each other. Ribs that change the eigenvalues of the holding portion are provided so as to be sandwiched between both sides in the circumferential direction. As a result, when a large vibration is input to the strut mount, the contact portion between the holding portion and the protruding portion provided on the axial end surface of the rubber elastic body is once separated or brought into contact with the contact portion. Since the frequency of the vibration generated at the contact portion and the resonance frequency of the holding portion that resonates at this time are shifted from each other, the vibration generated at the contact portion is difficult to be amplified by the holding portion. As a result, amplification of vibration transmitted from the holding portion to the vehicle interior via the body frame is prevented, and noise generated in the vehicle interior is reduced.

  In addition, a plurality of protrusions provided on both end surfaces in the axial direction of the rubber elastic body are provided at a distance in the circumferential direction, and the contact area between the protrusion and the holding portion on each axial end surface is a non-contact portion. Therefore, the vibration generated at the contact portion between the protruding portion and the holding portion is suppressed as much as possible. In the present invention, since the ribs are provided so as to be positioned on both sides in the circumferential direction with respect to each contact portion between the projecting portion and the holding portion thus provided, vibration generated in the contact portion is amplified. Effectively prevented.

  In the present invention, a plurality of protruding portions provided on both end surfaces in the axial direction of the rubber elastic body are arranged at a distance in the circumferential direction in a state of being pressed against the holding portion. The number of protrusions may be any number as long as the number is two or more. However, considering the balance in the circumferential direction on the axial end face, the number of protrusions is preferably 3 or more, and they are preferably arranged at equal intervals. The protruding portion is provided on the axial end surface of the rubber elastic body so that the contact area between the protruding portion and the holding portion is smaller than the area of the non-contact portion. When the contact area between the projecting portion and the holding portion is increased, vibrations generated by the separation and contact of the projection portion and the contact portion at the time of vibration input increase. Therefore, it is preferable to reduce the contact area.

  In the present invention, the rib provided on the holding portion may be provided on only one of the pair of holding portions or on both. However, in order to obtain a more reliable and good effect, it is preferable to provide ribs for both holding portions. Since the inner member or the outer member provided with the holding portion is usually formed by pressing a metal plate, a cast product, a forged product, or the like, the rib in the present invention is attached to the holding portion. And can be formed integrally in the state of being piled up. Moreover, you may make it fix the rib formed separately from the holding | maintenance part. Further, the rib can also be configured by a step portion formed by bending the holding portion in the axial direction. The shape, size, and the like of the rib are not particularly limited, and can be arbitrarily set according to the amount of change that changes the eigenvalue of the holding portion. In addition, it is also possible to set the holding portion to have a desired eigenvalue by appropriately setting the shape, size, or arrangement position of the rib.

  The rib in the present invention is preferably extended in the radial direction. If it is made like this, since the flat part of the holding part formed in a ring plate shape is normally divided in the circumferential direction, each divided part can have an eigenvalue. . As a preferable aspect in this case, the radial length of the rib is longer than the radial length of the contact portion where the protruding portion and the holding portion contact. If it is made in this way, the ribs are arranged so as to reliably surround both sides in the circumferential direction of the contact portion where the projecting portion and the holding portion are in contact with each other, so that amplification of vibration generated in the contact portion can be advantageously prevented. it can.

  Moreover, as another suitable aspect, it is preferable that the rib is provided on the surface opposite to the surface with which the protruding portion of the holding portion contacts. If this is done, the both ends of the rubber elastic body in the axial direction will not come into contact with the rib even when vibration is input. Therefore, the rib is provided without affecting the vibration isolation characteristics of the rubber elastic body. be able to.

  As another preferred embodiment, the rib is formed by a plurality of pairs of step portions formed by bending the holding portion in the axial direction and arranged at a distance in the circumferential direction. A recess that is displaced in the axial direction is provided between the two step portions that form the following. If it does in this way, a rib can be provided with respect to a holding | maintenance part by the method which can be made simple and low cost, such as press work.

  As a preferred aspect in this case, the recess is displaced toward the inner side in the axial direction. If it is made like this, the height of the protruding portion can be lowered while securing the necessary tightening margin of the protruding portion of the rubber elastic body arranged in pressure contact with the concave portion. And an advantageous shape. In addition, when the vibration is input in the twisting direction, the rotation radius of the pressure contact tip of the protruding portion is reduced, so that the pressure contact portion between the concave portion of the holding portion and the protruding portion is difficult to be separated. it can.

  There are two types of holding parts for holding both end surfaces of the rubber elastic body in the axial direction, one is provided on the inner member side and the other is provided on the outer member side. Is applicable.

  According to the strut mount of the present invention, the rubber elastic body has a plurality of protrusions that protrude outward in the axial direction from both axial end surfaces and are in pressure contact with each holding portion and spaced apart in the circumferential direction. The contact area between the protruding portion and the holding portion at each axial end surface is smaller than the area of the non-contact portion, and at least one of the pair of holding portions is in contact with the protruding portion and the holding portion. Since ribs that change the eigenvalues of the holding part are provided on both sides in the circumferential direction of each contact part, the vibration generated in each contact part where the protruding part and the holding part come into contact when a large vibration is input. Since it is possible to prevent amplification by the holding portion, it is possible to effectively reduce noise generated in the passenger compartment.

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

Embodiment 1
1 is a cross-sectional view taken along the axial direction of the strut mount according to the present embodiment, and is a cross-sectional view taken along the line II of FIG. 2, FIG. 2 is a plan view of the strut mount, and FIG. It is a bottom view of a strut mount.

  As shown in FIG. 1, the strut mount according to the present embodiment includes a pair of holding portions 14 and 18 which are composed of an upper cylindrical metal fitting 11 and a lower cylindrical metal fitting 16 and are opposed to each other with a distance in the axial direction (vertical direction). An inner member 1 having a ring plate-like outer member 2 coaxially disposed on the outer side of the inner member 1, and a pair of holding portions of the inner member 1 with an axially intermediate portion fixed to the outer member 2. 14 and 18, each of which has an annular rubber elastic body 3 interposed between the inner member 1 and the outer member 2. ing. That is, the strut mount is of a type in which a pair of holding portions 14 and 18 that hold both end surfaces in the axial direction of the rubber elastic body 3 are provided on the inner member 1 side.

  The inner member 1 is made of an iron-based metal, and includes an upper cylindrical fitting 11 having an upper end opened and a lower cylindrical fitting 16 having a lower end opened. The upper tubular fitting 11 is formed by a cylindrical tubular portion 12, a bottom wall portion 13 that closes the lower end side opening of the tubular portion 12, and a ring-shaped flange that extends radially outward from the upper end of the tubular portion 12. The holding part 14 is made. The lower cylindrical metal fitting 16 includes a large diameter cylindrical portion 17 having a larger diameter than the cylindrical portion 12 and a holding portion 18 formed by a ceiling wall portion that closes the upper end side opening of the large diameter cylindrical portion 17.

  The upper tubular fitting 11 and the lower tubular fitting 16 are coaxially connected in the axial direction by welding and joining the bottom wall portion 13 and the holding portion 18 being overlapped. Thereby, the holding part 14 of the upper cylindrical metal fitting 11 and the holding part 18 of the lower cylindrical metal fitting 16 are opposed to each other with a predetermined distance in the axial direction (vertical direction). Note that the outer diameter of the holding portion 14 of the upper cylindrical metal fitting 11 is set to be substantially the same as or slightly smaller than the outer diameter of the holding portion 18 of the lower cylindrical metal fitting 16.

  As shown in FIG. 2, a plurality of (six in this embodiment) first ribs 15 that change the eigenvalue of the holding portion 14 are provided at predetermined portions on the outer surface (upper surface) of the holding portion 14 of the upper cylindrical metal member 11. ..., 15 are provided. The first ribs 15,..., 15 extend in the radial direction from the inner peripheral end to the outer peripheral end of the holding portion 14, and projecting portions 33 provided on the axial end surface (upper end surface) of the rubber elastic body 3. The three contact portions where the 33 and the holding portion 14 come into contact are sandwiched between the two first ribs 15 and 15, and are provided on both sides in the circumferential direction of each contact portion. The radial length of the first ribs 15,..., 15 is longer than the radial length of the contact portion where the projecting portions 33,.

  Further, as shown in FIG. 3, second ribs 19,... 19 that change the eigenvalues of the holding portion 18 are provided at predetermined portions of the inner surface (lower surface) of the holding portion 18 of the lower cylindrical metal fitting 16. The second ribs 19,... 19 are extended in the radial direction from the inner peripheral end to the outer peripheral end of the holding portion 18, and the protruding portion 33 provided on the axial end surface (lower end surface) of the rubber elastic body 3. .., 33 are provided on both sides in the circumferential direction of each contact portion so as to sandwich each of the three contact portions where the holding portion 18 contacts with the two second ribs 19 and 19. The radial length of the second ribs 19,... 19 is also longer than the radial length of the contact portion where the protrusions 33,. In addition, shaft holes 13a and 18a through which a piston rod tip portion of a shock absorber (not shown) is inserted are provided in the center of the bottom wall portion 13 of the upper tube fitting 11 and the holding portion 18 of the lower tube fitting 16, respectively. It has been.

  As shown in FIGS. 1 to 3, the outer member 2 is formed of a ferrous metal in a ring plate shape. The outer member 2 has an inner diameter with a predetermined dimension that is larger than the outer diameter of the cylindrical portion 12 of the upper cylindrical fitting 11 and smaller than the outer diameter of the holding portion 14, and is coaxial with a distance from the outer peripheral side of the cylindrical portion 12. It is arranged in a shape. Circular holes 21 penetrating in the thickness direction are provided at three locations on the outer peripheral side end portion of the outer member 2, and the mounting holes 22,. , 22 are mounted.

  The rubber elastic body 3 is formed in an annular shape by vulcanization molding of a rubber material. The rubber elastic body 3 is vulcanized and bonded to the outer member 2 in a state where the inner peripheral side end portion of the outer member 2 is embedded in the outer peripheral portion of the intermediate portion in the axial direction. Further, on the inner peripheral side of the rubber elastic body 3, a ring-shaped connecting portion 31 protruding radially inward from the intermediate portion in the axial direction is vulcanized and bonded to the outer peripheral surface of the holding member 35 formed in a cylindrical shape. Yes. The rubber elastic body is coaxially disposed on the outer peripheral side of the cylindrical portion 12 by fitting the holding member 35 to the outer peripheral surface of the cylindrical portion 12 of the first cylindrical fitting 11, thereby It is disposed between a pair of holding portions 14, 18 provided on the member 1.

  On the both end surfaces in the axial direction of the rubber elastic body 3, three projecting portions 33,. They are provided at a distance (see FIGS. 2 and 3). Both end surfaces in the axial direction of the rubber elastic body 3 are not bonded to the holding portions 14 and 18, and only the projecting portions 33,. Therefore, a predetermined gap is formed between the portions other than the protruding portions 33,..., 33 and the holding portions 14 and 18. That is, the rubber elastic body 3 is subjected to the axial preliminary compression only on the projecting portions 33,. In each axial end face, the area of the portion where the projecting portions 33,... 33 and the holding portions 14, 18 are in contact with each other is made smaller than the area of the non-contact portion. Occasionally, vibration is prevented from being generated as much as possible at the contact portion between the projecting portions 33,... 33 and the holding portions 14 and 18.

  In the strut mount of the present embodiment configured as described above, a nut (not shown) is screwed onto the tip of the piston rod of a shock absorber (not shown) inserted into the shaft holes 13a, 18a of the inner member 1. As a result, the inner member 1 is attached to the piston rod, and the outer member 2 is attached to a vehicle body (not shown) with attachment bolts 22,. When the vehicle travels, vibrations transmitted from the road surface through the tires are absorbed by the shock absorber for expansion and contraction, and vibrations that cannot be absorbed by the shock absorber are absorbed by the rubber elastic body 3, thereby Prevents or suppresses vibration from the body from being transmitted to the body.

  When a large vibration is input to the strut mount, the pair of holding portions 14 and 18 provided on the inner member 1 and the protruding portions 33 provided on both end surfaces in the axial direction of the rubber elastic body 3. , 33 once leaves or abuts, the vibration occurs in the contact portion and the holding portions 14 and 18 resonate. At this time, since each holding part 14, 18 is provided with the first ribs 15, ..., 15 and the second ribs 19, ..., 19 so that the eigenvalues of the holding parts 14, 18 are changed, Amplification of vibration at the holding portions 14 and 18 is prevented. In particular, the first ribs 15,..., 15 and the second ribs 19,..., 19 are positioned on both sides in the circumferential direction with respect to the contact portions between the protrusions 33,. Therefore, amplification of vibration generated at each contact portion is effectively prevented. As a result, amplification of vibration transmitted from the holding portions 14 and 18 to the vehicle interior via the body frame is prevented, and noise generated in the vehicle interior is reduced.

  As described above, the strut mount of the present embodiment has the holding portions 14 and 18 of the inner member 1 on both sides in the circumferential direction of the contact portions where the protruding portions 33, ..., 33 and the holding portions 14 and 18 are in contact with each other. Since the first and second ribs 15 and 19 that change the eigenvalues of the holding portions 14 and 18 are provided, the projections 33,... 33 and the holding portions 14 and 18 come into contact with each other when a large vibration is input. Since it is possible to prevent the vibration generated in each contact portion from being amplified by the holding portions 14 and 18, noise generated in the vehicle interior can be effectively reduced.

  In addition, the strut mount of the present embodiment has the first and second ribs 15 and 19 provided in the holding portions 14 and 18 extending in the radial direction. Since the planar portions of the holding portions 14 and 18 are divided in the circumferential direction, each of the divided portions can have an eigenvalue. In addition, the radial length of the first and second ribs 15 and 19 ribs is longer than the radial length of the contact portion where the protruding portions 33,... Since the first and second ribs 15 and 19 are disposed so as to reliably surround both sides in the circumferential direction of the contact portion where the portions 33,..., 33 and the holding portions 14 and 18 contact, Amplification can be advantageously prevented.

  Further, in the strut mount of this embodiment, the first and second ribs 15 and 19 are provided on the surface opposite to the surface with which the projecting portions 33 of the holding portions 14 and 18 contact. Even at the time of vibration input, both end surfaces in the axial direction of the rubber elastic body 3 do not come into contact with the first and second ribs 15 and 19, so that the vibration isolation characteristics of the rubber elastic body 3 are not affected at all. First and second ribs 15 and 19 can be provided.

  In the strut mount of this embodiment, three protrusions 33 that are in pressure contact with the holding parts 14 and 18 are provided on both end surfaces in the axial direction of the rubber elastic body 3, respectively. When the number or shape, or the contact position with the holding portions 14 and 18 is changed, the first ribs 15,..., 15 provided on the holding portion 14 and the holding portion 18 are provided according to the change. The second ribs 19, ..., 19 are also changed as appropriate. For example, as shown in FIGS. 4 and 5, when four projecting portions 33,..., 33 are provided on both end surfaces in the axial direction of the rubber elastic body 3, the projecting portions 33,. The first and second ribs on both sides in the circumferential direction of each contact portion so as to be sandwiched between the two first ribs 15 and 15 or the two second ribs 19 and 19 with respect to each contact portion with the portions 14 and 18. 15 and 19 are provided.

[Embodiment 2]
6 is a cross-sectional view taken along the axial direction of the strut mount according to the present embodiment, and is a cross-sectional view taken along line VI-VI in FIG. 7, FIG. 7 is a plan view of the strut mount, and FIG. It is a bottom view of a strut mount.

  As shown in FIG. 6, the strut mount of this embodiment includes a pair of opposing members arranged in the axial direction (vertical direction) at a distance from the inner member 5 including a cylindrical base portion 51 and a flange-like support portion 56. An outer member 6 having holding portions 61b and 65b (68b) arranged coaxially on the outer side of the inner member 5, and a pair of holding portions of the outer member 6 with the axially intermediate portion fixed to the inner member 5 An annular rubber elastic body 7 interposed between the inner member 5 and the outer member 6 by 61b, 65b (68b) being held in a state in which both end surfaces in the axial direction are non-bonded and partly pressed. It is composed of That is, this strut mount is of a type in which a pair of holding portions 61b and 65b (68b) that hold both end surfaces in the axial direction of the rubber elastic body 7 are provided on the outer member 6 side.

  The inner member 5 is made of an iron-based metal, and has a cylindrical base 51 formed in a cylindrical shape and a ring extending radially outward from the outer peripheral surface of the axial intermediate portion of the cylindrical base 51. It consists of a flange-like support part 56 formed in a plate shape. Inside the cylindrical base 51, there is provided a shaft hole 51a through which a piston rod tip of a shock absorber (not shown) is inserted.

  The outer member 6 is made of an iron-based metal, and includes an upper cylinder fitting 61, a lower cylinder fitting 65, and an auxiliary cylinder fitting 68. The upper tube fitting 61 includes a cylindrical tube portion 61a, a holding portion 61b formed by a ring-shaped flange extending radially inward from the upper end of the tube portion 61a, and a radially outer portion from the lower end of the tube portion 61a. And a ring-shaped mounting flange portion 61c extending in the direction. The lower cylindrical metal fitting 65 is formed by a cylindrical cylindrical portion 65a that is substantially the same diameter as the cylindrical portion 61a and is longer than the cylindrical portion 61a, and a ring-shaped flange that extends radially inward from the lower end of the cylindrical portion 65a. The holding portion 65b and a ring-shaped mounting flange portion 65c extending radially outward from the upper end of the cylindrical portion 65a.

  The upper cylindrical fitting 61 and the lower cylindrical fitting 65 are welded and joined together with the mounting flange portions 61c and 65c of the fittings 61 and 65 overlapped after the rubber elastic body 7 is accommodated therein. Coaxially connected in the axial direction. Thereby, the holding part 61b of the upper cylinder fitting 61 and the holding part 65b of the lower cylinder fitting 65 are opposed to each other with a predetermined distance in the axial direction (vertical direction). Circular holes 62,..., 62 penetrating in the thickness direction are respectively provided at three locations in the circumferential direction of both mounting flange portions 61 c, 65 c, and mounting bolts 63 are provided in the respective circular holes 62,. , ..., 63 are mounted.

  As shown in FIG. 7, a plurality of (six in this embodiment) first ribs 64 that change the eigenvalues of the holding portion 61 b are provided at predetermined portions of the outer surface (upper surface) of the holding portion 61 b of the upper tubular metal fitting 61. ..., 64 are provided. The first ribs 64,..., 64 are extended in the radial direction from the inner peripheral end to the outer peripheral end of the holding portion 61b, and projecting portions 73 provided on the axial end surface (upper end surface) of the rubber elastic body 7. .., 73 are provided on both sides in the circumferential direction of the respective contact portions such that the three contact portions where the holding portion 61b contacts are sandwiched between the two first ribs 64, 64. The radial lengths of the first ribs 64,... 64 are longer than the radial lengths of the contact portions where the protrusions 73,.

  The auxiliary cylinder fitting 68 has a cylindrical cylinder part 68a formed with substantially the same diameter and length as the cylinder part 65a, and a ring-shaped flange extending radially inward from the lower end of the cylinder part 65a. And a holding portion 68b formed by the above. The holding portion 68b is formed to have substantially the same size as the holding portion 65b of the lower cylindrical metal fitting 65. The auxiliary cylinder fitting 68 is coaxially connected to the lower cylinder fitting 65 in the axial direction by welding and joining with the holding portion 68b overlapped with the holding portion 65b of the lower cylinder fitting 65. That is, the holding portion 68b of the auxiliary tube fitting 68 and the holding portion 65b of the lower tube fitting 65 are integrated.

  As shown in FIG. 8, second ribs 69,... 69 that change the eigenvalues of the holding portion 68 b are provided at predetermined portions of the inner surface (lower surface) of the holding portion 68 b of the auxiliary cylinder fitting 68. The second ribs 69,..., 69 are extended in the radial direction from the inner peripheral end to the outer peripheral end of the holding portion 68b, and the protruding portions 73 provided on the axial end surface (lower end surface) of the rubber elastic body 7 are provided. .., 73 are provided on both sides in the circumferential direction of each contact portion such that the three contact portions where the holding portion 68b contacts are sandwiched by the two second ribs 69, 69. The radial length of the second ribs 69,... 69 is also made longer than the radial length of the contact portion where the protrusions 73,.

  The rubber elastic body 7 is formed in an annular shape by vulcanizing and molding a rubber material, and the flange-like support portion 56 of the inner member 5 is embedded in the inner peripheral portion of the intermediate portion in the axial direction. It is vulcanized and bonded. The rubber elastic body 7 is accommodated in an internal space formed by the upper cylindrical fitting 61 and the lower cylindrical fitting 65 of the outer member 6 disposed outside the inner member 5. Thereby, it arrange | positions in the state by which the axial direction both end surfaces were hold | maintained between a pair of holding | maintenance parts 61b and 65b (68b) provided in the outer side member 6. FIG.

  On the both end surfaces in the axial direction of the rubber elastic body 7, there are three projecting portions 73, ..., 73 projecting outward in the axial direction from the respective end surfaces and in pressure contact with the holding portions 61b, 65b (68b). A predetermined distance is provided in the direction (see FIGS. 7 and 8). Both end surfaces in the axial direction of the rubber elastic body 7 are not bonded to the holding portions 61b and 65b (68b), and only the projecting portions 73,. Therefore, a predetermined gap is formed between the portions other than the projecting portions 73, ..., 73 and the holding portions 61b, 65b (68b). That is, the rubber elastic body 7 is preliminarily compressed in the axial direction only on the protruding portions 73.

  In each axial end face, the area of the portion where the protrusions 73, ..., 73 and the holding portions 61b, 65b (68b) are in contact with each other is made smaller than the area of the non-contact portion. When vibration is input, vibration is prevented from being generated as much as possible at the contact portion between the projecting portions 73, ..., 73 and the holding portions 61b and 65b (68b).

  The strut mount of the present embodiment configured as described above has a nut at the tip of the piston rod of a shock absorber (not shown) inserted into the shaft hole 51a of the inner member 5 as in the case of the first embodiment. The inner member 5 is attached to the piston rod by screwing (not shown), and the outer member 6 is attached to a vehicle body (not shown) with mounting bolts 63,. In some cases, vibration transmitted from the road surface through the tire is prevented or suppressed from being transmitted to the body.

  Even in the case of the strut mount of the present embodiment, when large vibrations are input, each contact between the protruding portions 73 of the rubber elastic body 7 and the holding portions 61b and 65b (68b) of the outer member 6 is achieved. As a result, it is possible to prevent amplification of vibrations transmitted from the holding parts 61b and 65b (68b) to the vehicle interior via the body frame. The same operation and effect as the case of the above-mentioned Embodiment 1 are produced, such as being able to effectively reduce the noise generated in the passenger compartment.

  In the case of the strut mount of the present embodiment, the number and shape of the protruding portions 73 of the rubber elastic body 7 or the contact positions with the holding portions 61b and 65b (68b) are the same as in the case of the first embodiment. If changed, the first and second ribs 64 and 69 provided in the holding portions 61b and 65b (68b) are also appropriately changed according to the change. For example, as shown in FIGS. 9 and 10, when four projecting portions 73,..., 73 are provided on each of both end surfaces in the axial direction of the rubber elastic body 7, the projecting portions 73,. Each of the contact parts with the parts 61b and 65b (68b) is sandwiched between the two first ribs 64 and 64 or the two second ribs 69 and 69 so that the first and Second ribs 64 and 69 are provided.

[Embodiment 3]
11 is a cross-sectional view taken along the axial direction of the strut mount according to the present embodiment, and is a cross-sectional view taken along line XI-XI in FIG. 12, FIG. 12 is a plan view of the strut mount, and FIG. FIG. 15 is a cross-sectional view taken along the axial direction of the outer member in the embodiment, and is a cross-sectional view taken along line XIII-XIII in FIG. 14, and FIG. 14 is a plan view of the outer member.

  As shown in FIGS. 11 and 12, the strut mount according to the present embodiment is composed of a pair of holding portions that are composed of an upper cylindrical metal fitting 41 and a lower cylindrical metal fitting 46 and are opposed to each other at a distance in the axial direction (vertical direction). The inner member 4 having 44 and 48, the ring plate-shaped outer member 8 disposed coaxially on the outer side of the inner member 4, and the pair of inner members 1 with the axially intermediate portion fixed to the outer member 8. The annular rubber elastic body 9 interposed between the inner member 4 and the outer member 8 is held by the holding portions 44, 48 in a state in which both end surfaces in the axial direction are non-adhered and partly pressed. It is composed of That is, this strut mount is of a type in which a pair of holding portions 44 and 48 for holding both axial end surfaces of the rubber elastic body 9 are provided on the inner member 4 side.

  The inner member 4 is made of an iron-based metal, and includes an upper cylindrical metal fitting 41 whose upper end is opened and a lower cylindrical metal fitting 46 whose lower end is opened. The upper tubular fitting 41 is formed by a cylindrical tubular portion 42, a bottom wall portion 43 that closes the lower end side opening of the tubular portion 42, and a ring-shaped flange that extends radially outward from the upper end of the tubular portion 42. The holding part 44 is made. The lower cylindrical metal fitting 46 includes a large-diameter cylindrical portion 47 having a diameter larger than that of the cylindrical portion 42 and a holding portion 48 formed by a ceiling wall portion that closes the upper end side opening of the large-diameter cylindrical portion 47.

  The upper tubular fitting 41 and the lower tubular fitting 46 are connected coaxially in the axial direction by welding and joining the bottom wall portion 43 and the holding portion 48 being overlapped. Thereby, the holding part 44 of the upper cylindrical metal fitting 41 and the holding part 48 of the lower cylindrical metal fitting 46 are opposed to each other with a predetermined distance in the axial direction (vertical direction). The outer diameter of the holding portion 44 of the upper cylindrical metal fitting 41 is set to be substantially the same as or slightly smaller than the outer diameter of the holding portion 48 of the lower cylindrical metal fitting 46.

  The holding portion 44 of the upper cylindrical metal fitting 41 is provided with three concave portions 45, 45, 45 formed so as to be displaced toward the inner side in the axial direction at equal intervals in the circumferential direction. Each recessed part 45, 45, 45 is provided in the position corresponding to the protrusion part 93, ..., 93 provided in the axial direction end surface (upper end surface) of the rubber elastic body 3, and the protrusion parts 93, ..., 93 are in contact with each other. It is a contact part to do. On each side in the circumferential direction of each of the recesses 45, 45, 45, there are provided six step portions 45a, ..., 45a as ribs formed by bending the holding portion 44 inward in the axial direction.

  The step portions 45a,..., 45a extend radially inward from the outer peripheral end of the holding portion 44 to the central portion in the radial direction, and the radial lengths thereof are the protruding portions 93,. , 45, 45 is made longer than the length in the radial direction of the contact portion. That is, the step portions 45a,..., 45a are provided so that each of the three contact portions where the projecting portions 93,... 93 and the recess portions 45, 45, 45 contact each other are sandwiched by two pair of step portions 45a, 45a. It has been.

  On the other hand, the holding portion 48 of the lower cylindrical metal fitting 46 is designed to have increased rigidity by the reinforcement plate 49 being fixed to the inner surface (lower surface) thereof. A shaft through which a piston rod tip of a shock absorber (not shown) is inserted into the center of each of the bottom wall 43 of the upper tubular fitting 41, the holding portion 48 of the lower tubular fitting 46, and the reinforcing plate 49. Holes 43a, 48a and 49a are provided, respectively.

  As shown in FIGS. 11 to 14, the outer member 8 is formed in a cylindrical shape by an iron-based metal plate, and extends radially outward from the cylindrical portion 81 and the upper end of the cylindrical portion 81. And a ring-shaped flange portion 82. The cylindrical portion 81 is curved so that the diameter gradually increases from the axially intermediate portion toward both end portions. The tubular portion 81 has an inner diameter with a predetermined dimension that is larger than the outer diameter of the tubular portion 42 of the upper tubular fitting 41 and slightly smaller than the outer diameter of the holding portion 44, and is spaced from the outer peripheral side of the tubular portion 42. Are arranged coaxially. The flange portion 82 is provided in a state inclined at a predetermined angle with respect to the axis. Circular holes 82a,..., 82a for attaching mounting bolts (not shown) are provided in three portions of the flange portion 82 in the thickness direction.

  The rubber elastic body 9 is formed in an annular shape by vulcanization molding of a rubber material. The rubber elastic body 9 is vulcanized and bonded to the outer member 8 in a state where the cylindrical portion 81 of the outer member 8 is embedded in the outer peripheral portion of the intermediate portion in the axial direction. Further, on the inner peripheral side of the rubber elastic body 9, a ring-shaped connecting portion 91 that protrudes radially inward from the axially intermediate portion is vulcanized and bonded to the outer peripheral surface of the holding member 95 formed in a cylindrical shape. Yes. The rubber elastic body 9 is coaxially disposed on the outer peripheral side of the cylindrical portion 42 by fitting a holding member 95 to the outer peripheral surface of the cylindrical portion 42 of the upper cylindrical fitting 41, thereby It is disposed between a pair of holding portions 44, 48 provided on the member 4.

  On the both end surfaces in the axial direction of the rubber elastic body 9, there are three projecting portions 93,..., 93 projecting outward from the respective end surfaces and in pressure contact with the respective holding portions 44, 48 in the circumferential direction. It is provided at a distance. The three protrusions 93, 93, 93 provided on one end surface of the rubber elastic body and the three protrusions 93, 93, 93 provided on the other end surface are out of phase in the circumferential direction. It is arranged.

  Both end surfaces in the axial direction of the rubber elastic body 9 are not bonded to the holding portions 44 and 48, and only the protruding portions 93, ..., 93 are in pressure contact. Therefore, a predetermined gap is formed between the portions other than the projecting portions 93,..., 93 and the holding portions 44, 48. That is, the rubber elastic body 9 is preliminarily compressed in the axial direction only on the protruding portions 93... 93. In each axial end face, the area of the portion where the protrusions 93,... 93 and the holding portions 44, 48 are in contact with each other is made smaller than the area of the non-contact portion. Occasionally, vibration is prevented from being generated as much as possible at the contact portion between the projecting portions 93,... 93 and the holding portions 44 and 48.

  The strut mount of the present embodiment configured as described above is similar to the case of the first embodiment described above in the piston rod of the shock absorber (not shown) inserted through the shaft holes 43a, 48a, 49a of the inner member 4. The inner member 4 is attached to the piston rod by screwing a nut (not shown) to the tip, and the outer member 8 is attached to the vehicle body (not shown) by a mounting bolt (not shown). During the traveling of the vehicle, vibration transmitted from the road surface through the tire is prevented or suppressed from being transmitted to the body.

  Even in the case of the strut mount of this embodiment, when a large vibration is input, it is generated at each contact portion between the protruding portions 93, ..., 93 of the rubber elastic body 7 and the holding portions 44, 48 of the inner member 4. Amplification of the vibrations can be effectively prevented. As a result, it is possible to prevent amplification of vibration transmitted from the holding portions 44 and 48 to the vehicle interior via the body frame, and to effectively reduce noise generated in the vehicle interior. The same operation and effect as in the case of 1 are obtained. In addition, when the strut mount of this embodiment performed sensory evaluation in the use condition with a real vehicle, it was confirmed that an abnormal noise does not generate | occur | produce.

  In particular, in the present embodiment, since the ribs are formed by the step portions 45a, ..., 45a formed by bending the holding portions 44, 48 in the axial direction, it is easy and cost reduction such as pressing. Ribs can be provided to the holding portions 44, 48 in a possible manner.

  Further, a recess 45 formed so as to be displaced toward the inner side in the axial direction is provided between the two step portions 45a, 45a that form a pair of the holding portions 44. The height of the projections 93,... 93 can be lowered while securing the necessary tightening margin of 93,... 93, so that the projections 93,. can do. When the vibration in the twisting direction is input, the radius of rotation of the pressure contact tip of the protrusions 93,... 93 is reduced, so that the recesses 45,. , 93 is difficult to separate, so that the generation of abnormal noise can be suppressed.

  In the present embodiment, one holding portion 48 formed in the lower cylindrical metal fitting 46 of the inner member 4 is provided with a recess 45 or a step (rib) 45a provided in the other holding portion 44. Although not provided, one of the holding portions 48 may be provided.

It is sectional drawing in alignment with the axial direction of the strut mount which concerns on Embodiment 1 of this invention, Comprising: It is the II sectional view taken on the line in FIG. It is a top view of the strut mount concerning Embodiment 1 of the present invention. It is a bottom view of the strut mount concerning Embodiment 1 of the present invention. It is a top view of the strut mount concerning the modification of Embodiment 1 of the present invention. It is a bottom view of the strut mount concerning the modification of Embodiment 1 of the present invention. It is sectional drawing in alignment with the axial direction of the strut mount which concerns on Embodiment 2 of this invention, Comprising: It is VI-VI sectional view taken on the line of FIG. It is a top view of the strut mount concerning Embodiment 2 of the present invention. It is a bottom view of the strut mount concerning Embodiment 2 of the present invention. It is a top view of the strut mount concerning the modification of Embodiment 2 of the present invention. It is a bottom view of the strut mount concerning the modification of Embodiment 2 of the present invention. It is sectional drawing in alignment with the axial direction of the strut mount which concerns on Embodiment 3 of this invention, Comprising: It is the XI-XI sectional view taken on the line of FIG. It is a top view of the strut mount concerning Embodiment 3 of the present invention. It is sectional drawing which follows the axial direction of the outer member in Embodiment 3 of this invention, Comprising: It is XIII-XIII sectional view taken on the line of FIG. It is a top view of the outside member in Embodiment 3 of the present invention. It is sectional drawing which follows the axial direction of the conventional strut mount.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1, 4, 5, 101 ... Inner member 11, 41, 61 ... Upper cylinder metal fitting 12, 42 ... Tube part 13, 43 ... Bottom wall part 13a, 43a, 51a ... Shaft hole 14, 18, 44, 48, 61b, 65b, 68b, 114, 118 ... holding portion 15, 64 ... first rib 16, 46, 65 ... lower cylindrical fitting 17 ... large diameter cylindrical portion 13a, 18a, 43a, 48a, 49a ... shaft hole 19, 69 ... first 2 rib 51 ... cylindrical base 56 ... flange-like support 2, 4, 6, 102 ... outer member 21, 62, 82a ... circular hole 22, 63 ... mounting bolt 68 ... auxiliary cylinder fitting 3, 7, 9, 103 ... Rubber elastic body 31 ... connecting part 33, 73 ... protrusion 35 ... holding member 45 ... step part (rib) 45a ... recess

Claims (6)

A cylindrical inner member attached to the tip of the piston rod of the shock absorber, an outer member coaxially disposed outside the inner member and attached to the vehicle body, and either the inner member or the outer member An axial intermediate portion is fixed to the member, and a shaft is provided by a pair of holding portions that are provided on the other member of the inner member and the outer member and extend in a direction perpendicular to the axis and are opposed to each other with a distance in the axial direction. In a strut mount provided with an annular rubber elastic body sandwiched in a state where both end surfaces in the direction are non-adhered and pressed,
A plurality of projecting portions that protrude outward in the axial direction and are in pressure contact with the holding portions and spaced apart in the circumferential direction are provided on both end surfaces in the axial direction of the rubber elastic body. While the contact area between the projecting part and the holding part is smaller than the area of the non-contact part,
At least one of the pair of holding portions is provided with ribs that change the eigenvalues of the holding portions on both sides in the circumferential direction of the contact portions where the protruding portions and the holding portions are in contact with each other. mount.   The strut mount according to claim 1, wherein the rib extends in a radial direction.   The strut mount according to claim 2, wherein a radial length of the rib is longer than a radial length of a contact portion where the protruding portion and the holding portion are in contact with each other.   The strut mount according to any one of claims 1 to 3, wherein the rib is provided on a surface opposite to a surface with which the protruding portion of the holding portion contacts.   The rib is formed by a plurality of pairs of step portions formed by bending the holding portion in the axial direction and arranged at a distance in the circumferential direction, and the two steps forming each pair of the holding portions. The strut mount according to any one of claims 1 to 3, wherein a concave portion displaced in the axial direction is provided between the portions.   The strut mount according to claim 5, wherein the recess is displaced toward the inner side in the axial direction.