JP6148904B2 - Outer bracket for cylindrical vibration isolator and cylindrical vibration isolator with outer bracket - Google Patents

Description

  The present invention relates to an outer bracket for a cylindrical vibration isolator that is mounted on a cylindrical vibration isolator body, and a cylindrical vibration isolator with an outer bracket using the outer bracket.

  2. Description of the Related Art Conventionally, a cylindrical vibration isolator with an outer bracket in which an outer bracket for a cylindrical vibration isolator (hereinafter referred to as an outer bracket) is attached to a cylindrical vibration isolator body is known. A cylindrical vibration isolator with an outer bracket is disclosed in, for example, Japanese Patent No. 2861667 (Patent Document 1), and has a cylindrical shape in which an inner shaft member and an outer cylindrical member are elastically connected by a main rubber elastic body. It has a structure in which the cylindrical portion of the outer bracket is externally fitted to the outer cylinder member with respect to the vibration isolator body.

  By the way, in the cylindrical vibration isolator with the outer bracket, there is provided a stopper means for limiting the relative displacement amount between the inner shaft member and the outer cylinder member with respect to an axial input in which shear deformation is dominant in the main rubber elastic body. Sometimes. This stopper means is comprised by contact | abutting with the axial direction end surface of the cylindrical part in an outer bracket, and the inner shaft member side, for example.

  However, in the structure in which the axial end surface of the cylindrical portion is used as the stopper contact surface in the stopper means, if the cylindrical portion is thin, the deformation rigidity of the cylindrical portion may be insufficient, and the stopper Since the contact area becomes small, a decrease in durability due to concentration of load tends to be a problem. On the other hand, if the cylindrical portion is simply made thicker, the deformation rigidity and stopper contact area of the cylindrical portion constituting the stopper contact surface can be sufficiently secured, while the weight of the outer bracket may increase significantly. there were.

Japanese Patent No. 2861667

  The present invention has been made in the background of the above-described circumstances, and the problem to be solved is that it is possible to set the stopper contact area with a high degree of freedom while suppressing an increase in weight, and the stopper contact surface. An object of the present invention is to provide a cylindrical anti-vibration outer bracket having a novel structure capable of efficiently obtaining deformation rigidity.

  It is another object of the present invention to provide a cylindrical vibration isolator with an outer bracket having a novel structure using the outer bracket for a cylindrical vibration isolator having the above-described excellent effects.

  Hereinafter, the aspect of this invention made | formed in order to solve such a subject is described. In addition, the component employ | adopted in each aspect as described below is employable by arbitrary combinations as much as possible.

A first aspect of the present invention includes a cylindrical portion having a cylindrical shape as a whole, to which a cylindrical vibration isolator main body made of a rubber elastic body having an inner shaft member is inserted and attached. In the outer bracket for a cylindrical vibration isolator, a stopper portion formed of a press plate with a constant thickness having a groove shape extending in the circumferential direction of the cylindrical portion is provided at the opening side end portions of the pair of side wall portions. The stopper is fixed to the outer peripheral surface of the cylindrical portion, and the bottom wall portion of the stopper portion is disposed opposite to the outer peripheral side of the cylindrical portion and extends in the circumferential direction of the cylindrical portion. The connecting corner portion of the pair of side wall portions and the bottom wall portion extends with a curved outer surface shape , and the inner shaft member side is brought into contact with the pair of side wall portions of the stopper portion so that the inner relative displacement in the axial direction of the shaft member and the cylindrical portion is limited Steal, and features.

  According to the outer bracket for a cylindrical vibration isolator having the structure according to the first aspect, the stopper abutment is performed using the outer side surface of the side wall portion of the stopper portion arranged on the outer peripheral surface of the cylindrical portion. The surface can be configured, and the area of the stopper contact surface can be easily secured.

  Moreover, since the stopper portion having the groove shape has the opening side end portions of the pair of side wall portions fixed to the outer peripheral surface of the cylindrical portion, the pair of side wall portions are mutually connected by the cylindrical portion and the bottom wall portion. It is connected. Accordingly, the deformation rigidity of the pair of side wall portions constituting the stopper abutting surface is increased, and the load resistance is improved. In particular, since the bottom wall portion is disposed opposite to the outer peripheral side of the cylindrical portion and the pair of side wall portions are connected to each other at two locations separated from each other, the reinforcing effect is exhibited more advantageously.

  Furthermore, since the connecting corner portion between the pair of side wall portions and the bottom wall portion in the stopper portion extends with a curved outer surface shape, the load resistance can be further improved in the connecting corner portion of the stopper portion. In addition, when the stopper contact surface is configured by the outer surfaces of the pair of side wall portions of the stopper portion, the connection corner portion has a curved outer surface shape, so that other members (buffer rubber, etc.) due to contact with the connection corner portion are formed. ) Damage is prevented.

  According to a second aspect of the present invention, in the outer bracket for a cylindrical vibration isolator described in the first aspect, an opening window is formed in the bottom wall portion of the stopper portion.

  According to the 2nd aspect, weight reduction of a stopper part is achieved by forming an opening window in the bottom wall part of a stopper part. In addition, since the opening window is formed in the bottom wall portion that is off the stopper contact surface, it is possible to reduce the weight while securing the area of the stopper contact surface.

  According to a third aspect of the present invention, in the outer bracket for a cylindrical vibration damping device described in the second aspect, the opening-side end portions of the pair of side wall portions of the stopper portion pass through the opening window. It is welded from the inner side in the width direction and is fixed to the outer peripheral surface of the cylindrical portion.

  According to the third aspect, the weld metal is prevented from projecting to the outer surface of the opening side end portion of the pair of side wall portions, and the stopper contact surface constituted by the outer surface of the pair of side wall portions is substantially reduced. A larger area can be secured. Further, by avoiding the weld metal from coming into contact with another member such as a buffer rubber, it is possible to prevent the buffer rubber from being cut.

  According to a fourth aspect of the present invention, in the outer bracket for a cylindrical vibration isolator described in any one of the first to third aspects, an outer surface of the pair of side wall portions in the stopper portion is the cylinder. It spreads on the same plane as the axial end face of the shaped part.

  According to the fourth aspect, the stopper contact surface is configured in cooperation with the outer side surface of the pair of side wall portions and the axial end surface of the cylindrical portion, so that the area of the stopper contact surface can be more efficiently achieved. Can get big. In particular, if the configuration of the third aspect is combined with the configuration of this aspect, it is possible to avoid the axial dimension of the outer bracket from becoming unnecessarily large due to the protrusion of the weld metal.

  According to a fifth aspect of the present invention, in the outer bracket for a cylindrical vibration isolator described in any one of the first to fourth aspects, one vibration isolation connection target member is provided on the outer peripheral side of the cylindrical portion. A fixed mounting portion is arranged, and a connecting portion between the cylindrical portion and the mounting portion is provided with a reinforcing portion extending in the circumferential direction of the cylindrical portion, and one end of the reinforcing portion is While being fixed to the attachment part, the other end of this reinforcement part is following the length direction edge part of the said stopper part.

  According to the fifth aspect, the reinforcing portion that connects the cylindrical portion and the mounting portion is provided continuously to the stopper portion, so that the connection structure between the cylindrical portion and the mounting portion has a simple structure with a small number of parts. It is realized with. Further, if the reinforcing portion has a groove shape similar to that of the stopper portion, sufficient strength can be obtained while preventing a significant increase in weight at the connecting portion between the cylindrical portion and the mounting portion.

  According to a sixth aspect of the present invention, in the outer bracket for a cylindrical vibration isolator described in the fifth aspect, the outer surface of the reinforcing portion is more axial than the axial end surface of the cylindrical portion. The reinforcing portion is welded to the outer peripheral surface of the cylindrical portion on the outer side in the width direction.

  According to the sixth aspect, as compared with the case where the reinforcing portion is welded from the inside with a groove shape, the reinforcing portion is welded from the outside, so that the welding work is facilitated, and the welding quality and dimensional accuracy are improved. It becomes easy to raise. Therefore, the outer bracket which achieves the intended durability and the like and is excellent in reliability can be provided.

  A seventh aspect of the present invention is a cylindrical vibration isolator with an outer bracket, wherein the inner shaft member and the outer cylinder member are inserted and removed in an external manner, and are elastically connected by a main rubber elastic body, thereby the cylindrical vibration isolator main body. The outer cylindrical member of the cylindrical vibration isolator body is press-fitted and fixed to the cylindrical portion of the outer bracket for a cylindrical vibration isolator described in any one of the first to sixth aspects. And a stopper means for limiting a relative displacement amount in the axial direction of the inner shaft member and the outer cylinder member by the stopper portion of the outer bracket coming into contact with the inner shaft member side. It is characterized by that.

  According to the cylindrical vibration isolator with an outer bracket structured according to the seventh aspect, the amount of relative displacement in the axial direction of the inner shaft member and the outer cylinder member is limited by the stopper means. Is prevented from being excessively deformed, and durability is improved. In addition, since the load resistance and area of the stopper abutment surface are ensured in the outer bracket, the intended stopper action can be obtained with high reliability. In addition, since the load resistance and securing of the stopper contact surface as described above are realized by a relatively lightweight outer bracket structure, the overall weight of the cylindrical vibration isolator can be reduced.

  According to an eighth aspect of the present invention, in the cylindrical vibration damping device with an outer bracket described in the seventh aspect, a buffer rubber is provided between contact surfaces of the inner shaft member side and the stopper portion of the outer bracket. The buffer rubber is provided so as to protrude to the outer peripheral side from the stopper portion.

  According to the eighth aspect, the inner shaft member side and the stopper part abut against each other indirectly via the shock-absorbing rubber, so that the hitting sound at the time of abutting is reduced based on the buffering action of the shock-absorbing rubber. Further, since the shock absorbing rubber protrudes further to the outer peripheral side than the stopper portion, even when the inner shaft member is displaced relative to the outer cylinder member in the twisting direction, the shock absorbing rubber is provided between the inner shaft member side and the stopper portion. The effect of reducing the hitting sound is effectively exhibited through the rubber.

  In addition, since the connecting corner between the pair of side walls and the bottom wall in the stopper portion has a curved outer surface shape, the buffer rubber is connected even if the shock absorbing rubber protrudes further to the outer peripheral side than the stopper portion. It does not break due to contact with the corner, and the durability of the cushioning rubber is sufficiently secured.

  According to the present invention, since the groove-shaped stopper portion is provided on the outer peripheral side of the cylindrical portion, the stopper abutting surface is configured by using the outer surfaces of the pair of side wall portions of the stopper portion. A sufficient contact area can be set on the stopper contact surface without making the cylindrical portion thicker than necessary. Moreover, the stopper portion is attached to the cylindrical portion so that the stopper portion is fixed to the outer peripheral surface of the cylindrical portion at the opening side end portions of the pair of side wall portions, and the bottom wall portion is disposed to face the outer peripheral side of the cylindrical portion. Therefore, the deformation rigidity of the pair of side wall portions is enhanced by the cylindrical portion and the bottom wall portion, and deformation due to the input of the stopper load is prevented. In addition, the connection corner between the pair of side walls and the bottom wall extends in a curved outer shape, so that the load resistance at the connection corner of the stopper is improved, and the connection angle of a buffer rubber or the like Damage due to contact with the portion is avoided, and reliability is also improved.

It is a right view which shows the outer bracket for cylindrical vibration isolator as one Embodiment of this invention. The front view of the outer bracket for cylindrical vibration isolator shown in FIG. The bottom view of the outer bracket for cylindrical vibration isolator shown in FIG. IV-IV sectional drawing of FIG. The right view of the engine mount using the outer bracket for cylindrical vibration isolator shown in FIG. The front view of the engine mount shown in FIG. The bottom view of the engine mount shown in FIG. VIII-VIII sectional drawing of FIG.

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

  1-4 show an outer bracket 10 for a cylindrical vibration isolator (hereinafter referred to as an outer bracket 10) as an embodiment of the present invention. The outer bracket 10 includes a cylindrical portion 12 to which a mount body 42 described later is inserted and attached. The cylindrical portion 12 is a high-rigidity member having a large-diameter substantially cylindrical shape, and includes an inner hole having a circular cross section that linearly extends with a substantially constant diameter.

  A mounting portion 14 is disposed on the outer peripheral side of the cylindrical portion 12. The attachment portion 14 has a bent plate shape and extends outward from the axial end surface of the tubular portion 12. Each mounting plate includes first and second mounting plate portions 16 and 18 extending in two different directions from a part of the circumference of the cylindrical portion 12 and protruding outward from the cylindrical portion 12. Bolt holes 20 are formed in the vicinity of the end portions of the portions 16 and 18, respectively.

  Further, a support portion 22 is provided between the tubular portion 12 and the attachment portion 14. The support portion 22 is a highly rigid member having a groove shape, and one end portion in the length direction is fixed to the first mounting plate portion 16 of the mounting portion 14 by means such as welding. Further, the pair of side wall portions of the support portion 22 having a groove shape are fixed by welding in abutting state with the end portions on the opening side being superimposed on the outer peripheral surface of the cylindrical portion 12. In addition, the width dimension of the support part 22 made into the groove shape is made smaller than the axial direction dimension of the cylindrical part 12, and a pair of side wall parts of the support part 22 from the outer side with respect to the outer peripheral surface of the cylindrical part 12 Welded. Thereby, the welding quality is improved by improving the workability of welding, and the tubular portion 12 and the mounting portion 14 are connected with high strength.

  Furthermore, a reinforcing portion 24 is provided between the tubular portion 12 and the attachment portion 14. The reinforcing portion 24 is a highly rigid member having a groove shape, and one end portion in the length direction is fixed to the second mounting plate portion 18 by means such as welding. On the other hand, the pair of side wall portions of the groove-shaped reinforcing portion 24 are fixed by welding in an abutting state in which the end portion on the opening side is overlapped with the outer peripheral surface of the cylindrical portion 12, and the reinforcing portion 24 is cylindrical. The shape portion 12 extends in the circumferential direction. As described above, the attachment portion 14 is fixed to the outer peripheral surface of the tubular portion 12 by the support portion 22 and the reinforcement portion 24. In addition, the width dimension of the reinforcement part 24 made into groove shape is made smaller than the axial direction dimension of the cylindrical part 12, and the outer surface of a pair of side wall part of the reinforcement part 24 is rather than the axial direction end surface of the cylindrical part 12. The pair of side wall portions of the reinforcing portion 24 are welded from the outside to the outer peripheral surface of the cylindrical portion 12. Thereby, compared with the case where it welds from an inner side, the workability | operativity at the time of welding the reinforcement part 24 to the cylindrical part 12 improves, and since welding quality is improved, the improvement of intensity | strength and durability is implement | achieved. The

  A stopper portion 26 is continuously provided on the other side in the length direction of the reinforcing portion 24. The stopper portion 26 is a groove-shaped member extending in the circumferential direction of the cylindrical portion 12, and connects the pair of side wall portions 28, 28 each having a flat plate shape and the pair of side wall portions 28, 28 to each other. The flat bottom wall 30 is integrally formed through the R-shaped connecting corners 32 and 32, so that it has a substantially U-shaped cross-sectional shape as a whole. Furthermore, as shown in FIG. 4, the connection corners 32, 32 between the pair of side walls 28, 28 and the bottom wall 30 have a curved outer surface shape, and the break points are formed on the outer surfaces of the connection corners 32, 32. And the formation of broken lines is avoided. In this embodiment, by bending both ends in the width direction of the long plate-shaped metal fitting by press working, the pair of side wall portions 28 and 28 and the bottom wall portion 30 are connected via the connecting corner portions 32 and 32 having curved outer surface shapes. It is integrally formed. In the present embodiment, the pair of side wall portions 28, 28 are provided substantially perpendicular to the bottom wall portion 30. Furthermore, the protruding dimension of the pair of side wall portions 28, 28 from the bottom wall portion 30 is made smaller than the distance between the opposing surfaces of the pair of side wall portions 28, 28, and the stopper portion 26 has a shallow groove shape. Has been.

  As shown in FIG. 4, the stopper portion 26 has a pair of side wall portions 28, 28 whose end surfaces on the opening side are abutted against the outer peripheral surface of the cylindrical portion 12, and are welded onto the outer peripheral surface of the cylindrical portion 12. It is fixed. As a result, the bottom wall portion 30 of the stopper portion 26 is disposed opposite to the cylindrical portion 12 at a predetermined distance on the outer peripheral side, and the pair of side wall portions 28 and 28 and the bottom wall portion 30 of the stopper portion 26 are arranged. A hollow tunnel-like space surrounded by the cylindrical portion 12 is formed. In the present embodiment, when the stopper portion 26 is mounted on the tubular portion 12, the outer side surfaces of the pair of side wall portions 28, 28 in the stopper portion 26 are substantially flush with the axial end surface of the tubular portion 12. The stopper contact surfaces 34 and 34 of the present embodiment are configured by the outer side surfaces of the pair of side wall portions 28 and 28 and the axial end surface of the cylindrical portion 12.

  Further, an opening window 36 is formed through the bottom wall portion 30 of the stopper portion 26. As shown in FIGS. 1 and 2, the opening window 36 is formed in the central portion in the width direction of the bottom wall portion 30 in the vicinity of the end portion of the stopper portion 26 on the side opposite to the reinforcing portion 24. It has an opening shape. By forming the opening window 36, the weight of the stopper portion 26 is reduced, and each of the opening side end portions of the pair of side wall portions 28 and 28 abutted against the outer peripheral surface of the cylindrical portion 12 is provided. The inner surface is exposed to the outside through the opening window 36. And in this embodiment, the stopper part 26 is being fixed to the cylindrical part 12 by welding the opening side edge part of a pair of side wall parts 28 and 28 from the width direction inner side through the opening window 36. FIG. By welding from the inside in this way, it is possible to avoid the weld metal being exposed on the stopper contact surface 34. In the present embodiment, a lightening hole 38 is formed on the reinforcing portion 24 side of the opening window 36, and the stopper portion 26 is further reduced in weight.

  As shown in FIGS. 5 to 8, the outer bracket 10 having such a structure constitutes an engine mount 40 for an automobile as a cylindrical vibration isolator with an outer bracket. That is, the engine mount 40 has a structure in which the outer bracket 10 is attached to a mount main body 42 as a cylindrical vibration isolator main body, and the mount main body 42 includes an inner shaft member 44 and an outer cylinder that are arranged inside and outside. The member 46 is elastically connected by a main rubber elastic body 48.

  More specifically, the inner shaft member 44 is a thick, small-diameter, generally cylindrical shape, and is a high-rigidity member formed of metal such as iron or aluminum alloy, fiber-reinforced synthetic resin, or the like. On the other hand, the outer cylinder member 46 is a thin and large-diameter, generally cylindrical shape, and is a highly rigid member formed of the same material as the inner shaft member 44.

  The inner shaft member 44 is inserted into the outer cylinder member 46, and the radial direction between the inner shaft member 44 and the outer cylinder member 46 is elastically connected by the main rubber elastic body 48. The main rubber elastic body 48 has a thick, large-diameter, generally cylindrical shape. The inner peripheral surface is vulcanized and bonded to the outer peripheral surface of the inner shaft member 44, and the outer peripheral surface is the inner periphery of the outer cylinder member 46. Vulcanized to the surface. The main rubber elastic body 48 of the present embodiment is formed as an integrally vulcanized molded product including an inner shaft member 44 and an outer cylinder member 46.

  Further, the main rubber elastic body 48 is formed with a first curling portion 50 and a second curling portion 52 penetrating in the axial direction. As shown in FIG. 5, the first curb portion 50 extends substantially in the circumferential direction, and both end portions in the circumferential direction reach the outer cylinder member 46. On the other hand, the second curb portion 52 is formed on the opposite side in the radial direction with the inner shaft member 44 sandwiched with respect to the first curb portion 50, and the hole cross section in which the circumferential width dimension increases toward the outer peripheral side. The stopper rubber 54 protrudes inward in the radial direction from the wall inner surface on the outer peripheral side while penetrating in the axial direction with a shape.

  The mount main body 42 having such a structure constitutes the engine mount 40 when the outer cylindrical member 46 is press-fitted and fixed to the cylindrical portion 12 of the outer bracket 10. As shown in FIG. 8, the outer cylinder member 46 side of the engine mount 40 is attached to the vehicle body 56 by fixing the mounting portion 14 of the outer bracket 10 to the vehicle body 56 as one vibration isolation connection target member. It is supposed to be. On the other hand, the engine mount 40 is configured such that the inner shaft member 44 is attached to the power unit 60 as the other anti-vibration connection target member via the inner bracket 58. As a result, the engine mount 40 is interposed between the vehicle body 56 and the power unit 60, and the vehicle body 56 and the power unit 60 are connected to each other in a vibration-proof manner. 5 to 8, the structure of the engine mount 40 alone is shown by a solid line, and the vehicle body 56, the power unit 60, and the inner bracket 58 are virtually shown by a two-dot chain line. 5-8, it shows in figure in the state in which the sharing support load of the power unit 60 is not input, but in the vehicle mounting state of the engine mount 40, between the inner shaft member 44 and the outer cylinder member 46, the power unit 60 is shown. The shared support load is input. As a result, the inner shaft member 44 is relatively displaced downward in FIG. 8 with respect to the outer cylindrical member 46, the width of the first straight portion 50 is widened, and the width of the second straight portion 52 is narrowed. A predetermined stopper clearance is set in each of the straight portions 50 and 52.

  6 and 7, the inner bracket 58 includes a pair of opposed plate portions 62 and 62 that sandwich the inner shaft member 44 from both sides in the axial direction, and is provided at one end of the pair of opposed plate portions 62 and 62. The pair of opposed plate portions 62 and 62 are fixed to the inner shaft member 44 by bolts (not shown) inserted through the provided bolt holes 64. Further, the other ends of the pair of opposing plate portions 62 and 62 are connected to each other by a connecting portion 66, and the inner bracket 58 is formed by bolts (not shown) inserted into a plurality of bolt holes 68 formed in the connecting portion 66. The power unit 60 is fixed.

  When the inner bracket 58 is mounted on the inner shaft member 44, the pair of opposed plate portions 62 and 62 are separated from the stopper contact surface 34 of the outer bracket 10 by a predetermined distance outward in the axial direction of the cylindrical portion 12. Opposed. The pair of opposing plate portions 62 and 62 abut against the stopper abutment surface 34 so that a stopper means for limiting the relative displacement in the axial direction of the inner shaft member 44 and the outer cylinder member 46 is configured. It has become. In the present embodiment, the inner bracket 58 fixed to the inner shaft member 44 contacts the stopper contact surface 34 of the outer bracket 10, so that the stopper portion 26 of the outer bracket 10 contacts the inner shaft member 44 side. Although the stopper means is configured, for example, by providing a projecting portion on the outer peripheral surface of the inner shaft member, the stopper means is brought into contact with the stopper portion 26 directly by the inner shaft member. It may be configured.

  Further, between the opposing surfaces of the pair of opposing plate portions 62, 62 of the inner bracket 58 and the stopper contact surfaces 34, 34 of the outer bracket 10, cushioning rubbers 70 are respectively disposed. The buffer rubber 70 is formed of a rubber elastic body having a substantially longitudinal plate shape, and the axial end portions of the inner shaft member 44 are inserted into insertion holes formed at one end portion in the longitudinal direction. It is supported by the inner shaft member 44. The shock absorbing rubber 70 extends toward the outer peripheral side in one radial direction, and an intermediate portion in the longitudinal direction is between the stopper contact surface 34 of the outer bracket 10 and the opposing plate portion 62 of the inner bracket 58. While being inserted, the other end portion in the longitudinal direction protrudes further to the outer peripheral side than the stopper contact surface 34. As a result, the pair of opposing plate portions 62, 62 of the inner bracket 58 and the stopper contact surfaces 34, 34 of the outer bracket 10 come into contact with each other via the buffer rubber 70. Therefore, the hitting sound at the time of contact is reduced.

  According to the engine mount 40 having the structure according to this embodiment, the stopper contact surface 34 constituting the stopper means is not only the axial end surface of the cylindrical portion 12 but also the pair of side wall portions in the stopper portion 26. 28 and 28 are comprised including the outer side surface. Therefore, the area of the stopper contact surface 34 can be appropriately set with a high degree of freedom by appropriately setting the shape and size of the stopper portion 26 attached to the cylindrical portion 12.

  In particular, in the present embodiment, the outer side surfaces of the pair of side wall portions 28, 28 in the stopper portion 26 and the axial end surface of the tubular portion 12 are arranged on substantially the same plane, The outer surface and the axial end surface of the cylindrical portion 12 cooperate to form stopper contact surfaces 34 and 34. Thereby, the area of each stopper contact surface 34 can be ensured more efficiently and larger than in the case where the stopper contact surfaces 34 and 34 are configured only by the stopper portion 26.

  Further, the pair of side wall portions 28, 28 constituting the stopper abutting surface 34 are fixed by welding with the end portion located on the opening side of the stopper portion 26 being abutted against the outer peripheral surface of the cylindrical portion 12. The end portions located opposite to the opening side are connected to each other by the bottom wall portion 30. Thereby, a pair of side wall parts 28 and 28 which comprise each stopper contact surface 34 are reinforced by the cylindrical part 12 and the bottom wall part 30, and the improvement with respect to the input with respect to a stopper load is achieved. In particular, the bottom wall portion 30 is disposed opposite to the outer peripheral side with respect to the tubular portion 12, and the pair of side wall portions 28, 28 are disposed at two locations separated in the radial direction of the tubular portion 12. 12 and the bottom wall portion 30 are connected to each other, so that the reinforcing effect on the pair of side wall portions 28 and 28 is efficiently exhibited.

  In addition, since the stopper portion 26 has a groove shape and a gap is formed between the bottom wall portion 30 of the stopper portion 26 and the cylindrical portion 12, the area of the stopper contact surface 34 and the stopper contact An increase in the weight of the outer bracket 10 can be suppressed while sufficiently securing the deformation rigidity of the side wall portion 28 constituting the surface 34.

  Further, an opening window 36 is formed through the bottom wall portion 30 of the stopper portion 26 so that the weight of the stopper portion 26 can be reduced without reducing the area of the stopper contact surfaces 34 and 34. In addition, in the bottom wall portion 30 of the present embodiment, a lightening hole 38 is formed in addition to the opening window 36, and further weight reduction is realized.

  Further, the pair of side wall portions 28, 28 have their inner side surfaces exposed to the outside through the opening window 36 with the end on the opening side being abutted against the outer peripheral surface of the cylindrical portion 12, and through the opening window 36. A pair of side walls 28, 28 are welded to the cylindrical portion 12 from the inside by inserting a welding torch or the like. Thereby, it is possible to prevent the weld metal from protruding onto the stopper contact surfaces 34, 34, and to secure a large substantial area of the stopper contact surfaces 34, 34, and to the buffer metal 70 or the like on the weld metal. It is possible to prevent other members from coming into contact and being damaged.

  Moreover, in the stopper part 26, since the connection corner | angular parts 32 and 32 of a pair of side wall parts 28 and 28 and the bottom wall part 30 have a curved outer surface shape, for example, the buffer rubbers 70 and 70 contact. It is possible to avoid problems such as cutting.

  Further, the shock-absorbing rubbers 70, 70 are prevented from being damaged due to contact with the connection corners 32, 32, so that the shock-absorbing rubbers 70, 70 can be projected to the outer peripheral side from the stopper part 26. Yes. As a result, even when the inner shaft member 44 and the outer cylinder member 46 are relatively twisted and displaced, the pair of opposed plate portions 62 and 62 of the inner bracket 58 and the stopper contact surfaces 34 and 34 of the outer bracket 10 are It is possible to obtain an effective stopper function while abutting through the buffer rubbers 70 and 70 to prevent hitting sound.

  As mentioned above, although embodiment of this invention was explained in full detail, this invention is not limited by the specific description. For example, the stopper abutment surface is not limited to one in which the outer side surfaces of the pair of side wall portions 28, 28 in the stopper portion 26 and the axial end surface of the cylindrical portion 12 are configured in cooperation. The stopper abutting surface can be configured only by the outer side surfaces of the side wall portions 28 and 28.

  Moreover, in the said embodiment, although the structure where the stopper part 26 and the reinforcement part 24 are integrally formed and it continues in the length direction is illustrated, for example, a cylindrical part is used as a stopper part and a reinforcement part as another members, respectively. 12 may be arranged so as to be continuous with each other in the length direction.

  Further, the pair of side wall portions of the stopper portion may be welded to the cylindrical portion 12 from the outside in the same manner as the side wall portions of the support portion 22 and the reinforcing portion 24 in the embodiment. On the other hand, the side wall portion of the support portion and the side wall portion of the reinforcing portion can be welded to the cylindrical portion 12 from the inside, similarly to the side wall portion 28 of the stopper portion 26 of the above-described embodiment.

  Moreover, in the said embodiment, although the stopper part 26 extended by the length of about 1/4 circumference in the circumferential direction of the cylindrical part 12 is illustrated, the length of a stopper part is not specifically limited.

  Further, the opening window formed in the bottom wall portion of the stopper portion is not limited to one, and by arranging a plurality of opening windows in the circumferential direction, while ensuring the total opening area of these opening windows, The circumferential length of each opening window can be reduced to prevent the deformation rigidity of the stopper portion from being partially reduced on the circumference.

10: Outer bracket for cylindrical vibration isolator, 12: cylindrical portion, 14: mounting portion, 24: reinforcing portion, 28: side wall portion, 30: bottom wall portion, 32: connection corner portion, 36: opening window, 42 : Mount main body (cylindrical vibration isolator main body), 44: Inner shaft member, 46: Outer cylinder member, 48: Main rubber elastic body, 56: Vehicle body (one vibration isolating connection target member), 70: Shock absorbing rubber

Claims (8)

An outer bracket for a cylindrical vibration isolator having a cylindrical portion with a fixed thickness as a whole, into which a cylindrical vibration isolator main body made of a rubber elastic body with an inner shaft member is inserted and attached. In
A stopper portion made of a press plate with a certain thickness and having a groove shape extending in the circumferential direction of the cylindrical portion is fixed to the outer peripheral surface of the cylindrical portion at the opening side end portions of the pair of side wall portions. And the bottom wall portion of the stopper portion is spaced apart from the outer peripheral side of the cylindrical portion and extends in the circumferential direction of the cylindrical portion, and the pair of side wall portions and the bottom wall of the stopper portion The connecting corner portion extends with a curved outer surface shape , and the inner shaft member side is brought into contact with the pair of side wall portions in the stopper portion so that the inner shaft member and the cylindrical portion are axially contacted with each other. An outer bracket for a cylindrical vibration damping device, characterized in that the relative displacement amount is limited .   The outer bracket for a cylindrical vibration isolator according to claim 1, wherein an opening window is formed in the bottom wall portion of the stopper portion.   The cylindrical shape according to claim 2, wherein the opening side end portions of the pair of side wall portions of the stopper portion are welded from the inner side in the width direction of the stopper portion through the opening window and are fixed to the outer peripheral surface of the cylindrical portion. Outer bracket for vibration isolator.   The outer side surface of the said pair of side wall part in the said stopper part has spread on the same plane as the axial direction end surface of the said cylindrical part, The outer side for cylindrical vibration isolator of any one of Claims 1-3 bracket.   A mounting portion fixed to one of the vibration isolation connection target members is disposed on the outer peripheral side of the cylindrical portion, and a connecting portion between the cylindrical portion and the mounting portion is provided in a circumferential direction of the cylindrical portion. An extending reinforcing portion is provided, one end of the reinforcing portion is fixed to the mounting portion, and the other end of the reinforcing portion is continuous with the lengthwise end of the stopper portion. 5. The outer bracket for a cylindrical vibration damping device according to any one of 4 above.   The outer surface of the reinforcing portion is positioned on the inner side in the axial direction of the cylindrical portion with respect to the axial end surface of the cylindrical portion, and the reinforcing portion is welded to the outer peripheral surface of the cylindrical portion on the outer side in the width direction. The outer bracket for a cylindrical vibration isolator according to claim 5.   An inner shaft member and an outer cylinder member are inserted / extracted and elastically connected by a main rubber elastic body to constitute a cylindrical vibration isolator body, and the outer cylinder member of the cylindrical vibration isolator body is claimed. The outer bracket for a cylindrical vibration isolator described in any one of 1 to 6 is press-fitted and fixed to the cylindrical portion, and the stopper portion of the outer bracket abuts on the inner shaft member side. A cylindrical vibration isolator with an outer bracket, wherein stopper means for limiting the relative displacement in the axial direction of the inner shaft member and the outer cylinder member is configured.   A shock absorbing rubber is disposed between contact surfaces of the inner shaft member side and the stopper portion of the outer bracket, and the shock absorbing rubber projects from the stopper portion to the outer peripheral side. A cylindrical vibration isolator with an outer bracket according to claim 7.

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