JP2020045931A - Cylinder type vibration control device - Google Patents

Abstract

To provide a cylinder type vibration control device having a new structure which prevents removal from a holder effectively without severely impairing workability of attachment to the holder.SOLUTION: In a cylinder vibration control device 10 in which an inner shaft member 12 and an outer cylinder member 14 are coupled by a body rubber elastic body 16, a step part 18 expanding from one axial end part of the outer cylinder member 14 made of a synthetic resin to the inner periphery side is provided. Further, an engagement piece 20 including an engagement claw 22 which engages with an opening end edge of an attachment hole 44 to which the outer cylinder member 14 is attached is provided protruding from the step part 18 to the axial outer side.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a tubular vibration isolator provided with an outer tubular member made of synthetic resin.

  2. Description of the Related Art Conventionally, as one type of vibration isolator, a tubular vibration isolator in which an inner shaft member and an outer tubular member are connected by a rubber elastic body is known. Such a cylindrical vibration isolator is used for, for example, an automobile member mount, an engine mount, a body mount, a differential mount, and the like.

  In general, such a cylindrical vibration isolator has an inner shaft member fixed to one member to be vibration-isolated and connected by a bolt or the like, and a cylindrical member provided to the other member to be vibration-isolated and connected. The outer cylindrical member is mounted by being press-fitted into the holder portion.

  By the way, in recent years, as described in Japanese Utility Model Laid-Open No. 5-77637 (Patent Document 1), a synthetic resin is used instead of a conventional metal outer cylinder member for reasons such as weight reduction and manufacturing cost reduction. The adoption of an outer cylinder member made of aluminum is being studied.

  However, the outer cylinder member made of a synthetic resin is difficult to stably obtain a press-fitting fixing force to a holder for a long period of time due to heat and settling due to a change with time, and it is difficult to secure an axial removal resistance. Was.

  In addition, as shown in the above-mentioned Patent Document 1, in order to secure the axial pull-out resistance in the outer cylinder member made of synthetic resin, a locking projection provided on the outer peripheral surface of the outer cylinder member is provided. A structure in which the mounting hole is locked to an end face of the mounting hole has also been proposed. However, if the protrusion height of the locking projection is increased to increase the pull-out resistance, the locking projection may become an obstacle when the outer cylinder member is inserted into the mounting hole and mounted. It was difficult to obtain sufficient pulling resistance at the locking projection.

Japanese Utility Model Laid-Open No. 5-77637

  A problem to be solved by the present invention is to provide a cylindrical vibration isolator having a novel structure that can effectively prevent the holder from being detached from the holder without significantly impairing the workability of mounting the holder on the holder. It is in.

  Hereinafter, embodiments of the present invention made to solve such problems will be described. The components employed in each of the embodiments described below can be employed in any combination as possible.

  According to a first aspect of the present invention, there is provided a cylindrical vibration damping device in which an inner shaft member and an outer cylindrical member are connected by a main rubber elastic body, wherein one end in the axial direction of the outer cylindrical member made of synthetic resin is provided. A locking portion provided with a stepped portion that extends from the inner side to the inner side, and a locking claw that is locked to an opening edge of a mounting hole in which the outer cylindrical member is mounted. , And projecting outward in the axial direction.

  According to the cylindrical vibration isolator having the structure according to this aspect, the locking claw is locked to the opening edge or the like of the mounting hole of the holder, so that the drag from the holder is exhibited. Also, in the outer cylinder member, since the stepped portion is provided at the axial end portion having the locking claw, the rigidity of the outer cylinder member itself can be improved by the reinforcing action by the stepped portion. In addition, the heat and deformation of the tubular main body portion of the outer tubular member mounted on the holder are suppressed from reaching the locking piece, and the locking by preventing heat and stress of the locking piece is avoided. The locked state of the nail in the mounting hole can be stably maintained.

  Further, by employing the outer cylinder member according to the present embodiment, the outer cylinder member can be used not only for a cylindrical pipe-shaped holder but also for a cup-shaped holder having a hole in the center of the bottom of a substantially bottomed cylinder. Can be mounted so that the locking claw is hooked on the opening edge of the hole at the center of the bottom of the cup-shaped holder.

  According to a second aspect of the present invention, in the cylindrical vibration isolator according to the first aspect, the stepped portion provided with the locking piece is partially provided in a circumferential direction of the outer cylindrical member. Is what it is.

  According to the cylindrical vibration damping device having the structure according to this aspect, the free surface area of the rubber elastic body can be increased in the portion where the stepped portion is not provided, and the degree of freedom in tuning the vibration damping characteristics and the durability can be improved. The performance can be improved. In addition, since the locking piece is more easily bent than when the locking piece is provided over the entire circumference, the insertion of the locking piece provided with the locking claw into the mounting hole can be facilitated.

  According to a third aspect of the present invention, in the cylindrical vibration isolator according to the second aspect, the step-shaped portion provided with the locking pieces is opposed to each other in a direction perpendicular to an axis of the outer cylinder member. It is provided.

  According to the cylindrical vibration damping device having the structure according to this aspect, it is easy to make the shape of the main rubber elastic body different in two directions perpendicular to each other and perpendicular to the axis.

  According to a fourth aspect of the present invention, in the cylindrical vibration damping device according to any one of the first to third aspects, the main rubber elastic body includes a portion between the stepped portion and the inner shaft member. A hollow portion that opens outward in the axial direction is formed.

  According to the cylindrical vibration isolator having the structure according to this aspect, in the rubber elastic body, the free surface area of the portion whose radial dimension is reduced by the step-shaped portion can be increased by providing the hollow portion. And the durability can be improved.

  ADVANTAGE OF THE INVENTION According to the cylindrical vibration-isolation device comprised by the structure according to this invention, it becomes possible to obtain the axial removal resistance from a holder stably by a locking claw, ensuring the favorable insertion property to a holder. .

FIG. 1 is a perspective view showing a cylindrical vibration isolator as one embodiment of the present invention. FIG. 2 is a plan view of the cylindrical vibration isolator shown in FIG. 1. FIG. 2 is a bottom view of the cylindrical vibration isolator shown in FIG. 1. IV-IV sectional drawing in FIG. VV sectional drawing in FIG. FIG. 2 is a longitudinal sectional view showing a state in which the cylindrical vibration isolator shown in FIG. 1 is mounted on a vehicle.

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

  First, FIGS. 1 to 5 show a suspension member mount 10 for an automobile as an embodiment of a cylindrical vibration isolator according to the present invention. The suspension member mount 10 has a structure in which an inner shaft member 12 and an outer cylinder member 14 are inserted and arranged at a predetermined distance inside and outside, and the inner shaft member 12 and the outer cylinder member 14 are elastically connected by a main rubber elastic body 16. Have. In the following description, the vertical direction and the axial direction refer to the vertical direction in FIG. 4 in principle.

  More specifically, the inner shaft member 12 is formed of a material such as a metal and a synthetic resin. In addition, it has a substantially cylindrical shape with a thick wall and a small diameter as a whole, and extends substantially straight in the vertical direction.

  The outer cylinder member 14 is formed of a synthetic resin material reinforced as necessary. In addition, as shown in FIG. 4, it has a thin, large-diameter, substantially cylindrical shape as a whole, and extends substantially straight in the vertical direction.

  Then, the outer cylinder member 14 is externally inserted into the inner shaft member 12, and the inner shaft member 12 and the outer cylinder member 14 are arranged at a predetermined distance in the direction perpendicular to the axis over the entire circumference. A main rubber elastic body 16 is interposed between the member 12 and the outer cylinder member 14. Particularly, in the present embodiment, the inner shaft member 12 and the outer cylinder member 14 are coaxially arranged on one mount center axis. In the present embodiment, the axial dimension of the inner shaft member 12 is larger than the axial dimension of the outer tubular member 14, and the inner shaft member 12 is moved outward from both axial sides of the outer tubular member 14. It is protruding.

  The main rubber elastic body 16 is a thick rubber elastic body having a substantially cylindrical shape. The inner peripheral surface is overlapped and fixed to the outer peripheral surface of the inner shaft member 12, and the outer peripheral surface is Are superimposed on and fixed to the inner peripheral surface of the. Thereby, the inner shaft member 12 and the outer cylinder member 14 are elastically connected in the direction perpendicular to the axis by the main rubber elastic body 16. The main rubber elastic body 16 can be formed as an integrally vulcanized molded product including the inner shaft member 12 and the outer cylinder member 14.

  Here, the outer tubular member 14 of the present embodiment is provided with a stepped portion 18 that extends toward the inner peripheral side at an upper end portion that is one end portion in the axial direction. In the present embodiment, the step-like portion 18 is partially formed in the circumferential direction. In particular, in the present embodiment, the pair of step-like portions 18 are formed to face each other in the direction perpendicular to the axis. Specifically, formed portions and non-formed portions of the step-shaped portions 18 are alternately formed at substantially equal intervals (approximately every 90 degrees) in the circumferential direction and with a circumferential dimension of approximately 90 degrees. Further, the stepped portion 18 is formed in a size that does not reach the inner shaft member 12 located on the inner peripheral side, and a gap is formed between the stepped portion 18 and the inner shaft member 12 in the radial direction. ing.

  Further, the stepped portion 18 is provided with a locking piece 20 protruding outward (upward) in the axial direction. In the present embodiment, the locking piece 20 is formed by the inner peripheral edge of the stepped portion 18. At a substantially entire length in the circumferential direction. The locking piece 20 extends substantially straight upward and has a substantially constant thickness dimension or becomes slightly thinner toward the protruding tip, and is applied to an outer peripheral side by applying an external force. It is elastically deformable so as to bend. In the present embodiment, the locking piece 20 is formed with a dimension that does not extend from the step-shaped portion 18 to the upper end of the inner shaft member 12.

  At the protruding tip of the locking piece 20, a locking claw 22 protruding to the outer peripheral side is provided. In the present embodiment, the locking claw 22 is formed over substantially the entire length of the locking piece 20 in the circumferential direction, and the lower end surface of the locking claw 22 is a flat surface 24 that extends in a direction perpendicular to the axis. The outer peripheral surface is an inclined surface 26 which is inclined upward in a direction in which the thickness dimension of the locking claw 22 gradually decreases.

  On the other hand, an annular flange portion 28 is formed at a lower end portion, which is the other end portion in the axial direction, of the outer cylinder member 14 and extends outward in a direction perpendicular to the axis. A stopper rubber 30 is fixed to the lower surface of the flange portion 28, and is formed so as to protrude outward (downward) in the axial direction from the flange portion 28. The stopper rubber 30 protrudes axially outward from the axial lower end surface of the inner shaft member 12 and is formed integrally with the main rubber elastic body 16. In the present embodiment, the stopper rubber 30 has a thick, substantially annular shape.

  Further, in the present embodiment, at one end (upper end) in the axial direction of the main rubber elastic body 16, an upper curving portion 32 is formed around the inner shaft member 12. Extending toward you. On the other hand, at the other end (lower end) in the axial direction of the main rubber elastic body 16, a lower curving portion 34 is formed around the inner shaft member 12, and opens downward to extend inward in the axial direction. ing.

  Furthermore, in the present embodiment, the outer cylindrical member 14 extends in the axial direction at the circumferential portion where the step-shaped portion 18 is formed so as to connect in the axial direction so as to connect both bottom surfaces of the upper curling portion 32 and the lower curling portion 34. A slit hole 36 is formed as a hollow portion. The slit hole 36 is formed along the outer peripheral surface of the inner shaft member 12. Further, both circumferential end portions of the slit hole 36 extend radially outward along both circumferential end edges of the stepped portion 18 of the outer tubular member 14, and a cylindrical main body portion of the outer tubular member 14. Near the inner circumference. Thereby, in FIG. 5, elastic deformation and transmission of stress are reduced between the left and right rubber elastic portions 16a, 16a sandwiching the inner shaft member 12, and the upper and lower rubber elastic portions 16b, 16b. 5, the main rubber elastic body 16 is mainly deformed by compression when inputting vibration in the left-right direction in FIG. 5, while the main rubber elastic body 16 is mainly sheared by deformation when inputting vibration in the vertical direction in FIG. It has become so. As a result, the spring ratio in the two directions perpendicular to the axis perpendicular to each other is set large, and the stress in the main rubber elastic body 16 near the boundary between the portion where the pair of stepped portions 18 and 18 is formed and the portion where it is not formed is formed. Concentration has been eased.

  In this embodiment, the main rubber elastic body 16 is also fixed to the lower surface (the inner surface in the axial direction) of the stepped portion 18, and the main rubber elastic body 16 is attached to the stepped portion 18 at the position where the stepped portion 18 is formed. , And the formation of the slit hole 36, the upper curving portion 32 does not substantially exist. Further, the slit hole 36 is opened axially outward (upward) between the stepped portion 18 and the inner shaft member 12, and the radial dimension of the upper opening of the slit hole 36 is equal to the stepped portion 18. And the inner diameter of the inner shaft member 12 in the radial direction. Further, the radial dimension of the slit hole 36 gradually increases downward.

  FIG. 6 shows a state in which the suspension member mount 10 having the above structure is mounted on a vehicle. In the present embodiment, the suspension member mount 10 is fixed to a holder 38 provided on the suspension member. In particular, the holder 38 of the present embodiment is an inverted cup-shaped holder, in which an annular plate-shaped upper bottom wall 42 is provided at an upper opening of a substantially cylindrical peripheral wall 40. It has a substantially bottomed cylindrical shape. In addition, an insertion hole 44 through which the inner shaft member 12 is inserted at the time of attachment to a vehicle is formed in the center of the upper bottom wall portion 42. On the other hand, an annular flange 46 protruding outward is formed in the lower opening of the peripheral wall 40. The inner diameter of the peripheral wall 40 is equal to or slightly smaller than the outer diameter of the outer tubular member 14. The inner diameter of the insertion hole 44 is substantially equal to or slightly smaller than the outer diameter of the locking piece 20, while being smaller than the maximum outer diameter of the locking claw 22. As can be understood from FIG. 6, in the present embodiment, the inner peripheral surface of the locking piece 20 extends radially outward from the outer peripheral surface of the inner shaft member 12 and extends straight in the axial direction substantially in parallel. ing. The outer peripheral corner of the upper end of the cylindrical main body in the outer cylindrical member 14 is chamfered to improve the workability of press-fitting the holder 38.

  The locking piece having the outer cylindrical member 14 press-fitted into the peripheral wall portion 40 of the holder 38 having such a structure, and the locking claw 22 provided in the insertion hole 44 provided in the upper bottom wall portion 42. Insert 20. At the time of such insertion, the inclined surface 26 of the locking claw 22 and the lower opening peripheral edge of the insertion hole 44 come into contact with each other, and the locking piece 20 is elastically deformed to the inner peripheral side. The locking claw 22 can be inserted through the insertion hole 44. When the locking claw 22 passes over the insertion hole 44, the locking piece 20 is elastically restored and deformed, and the locking claw 22 is locked on the outer surface (upper surface) of the opening edge of the insertion hole 44. You. Thereby, in addition to the fitting force by press-fitting the outer cylinder member 14 into the holder 38 (peripheral wall portion 40), the locking force of the locking claw 22 to the holder 38 (upper bottom wall portion 42) is exerted, and the suspension is performed. The member mount 10 is prevented from falling down from the holder 38. Further, the flange member 28 of the outer cylinder member 14 and the flange 46 of the holder 38 abut against each other, thereby preventing the suspension member mount 10 from moving upward with respect to the holder 38. With such a structure, the suspension member mount 10 is fixed in a state where the suspension member mount 10 is positioned vertically with respect to the holder 38. In the present embodiment, the inner shaft member 12 is inserted through the holder 38 with a gap. The outer claw 22 is locked using the insertion hole 44 to form a mounting hole in which the outer cylinder member 14 is mounted. The suspension member mount 10 is mounted on the holder 38 such that, for example, the vertical direction in FIG. 6 is the vertical direction of the vehicle.

  Further, for example, a fixing bolt implanted in the vehicle body is inserted into the inner shaft member 12 and tightened with a nut, so that the inner shaft member 12 is bolted to the vehicle body. Thus, the vehicle body and the suspension member are vibration-isolated and connected by the suspension member mount 10.

  In the suspension member mount 10 according to the present embodiment having the above-described structure, since the stepped portion 18 is provided at the upper end of the outer tubular member 14, for example, when the outer tubular member has a simple tubular shape. Rigidity is improved as compared with. In addition, the provision of the stepped portion 18 allows the heat and external force exerted on the cylindrical main body portion which is press-fitted into the holder 38 of the suspension member and directly contacted to be exerted or transmitted to the locking piece 20. Since this is reduced or avoided, settling of the locking piece 20 and the locking claw 22 is suppressed, and the locking action of the locking claw 22 on the opening edge of the insertion hole (mounting hole) 44 is suppressed. Stabilization can be achieved.

  Further, even when the holder is a cup-shaped holder as in the present embodiment, the outer cylindrical member 14 is prevented from coming off by the engagement of the engagement piece 20 provided with the engagement claw 22 with the opening edge of the holder 38. The mechanism can be easily realized. That is, as shown in FIG. 6, in a locking piece extending straight outward in the axial direction from the cylindrical peripheral wall portion of the outer cylinder member as described in Patent Document 1, a fitting hole of the outer cylinder member is provided as shown in FIG. It cannot be locked to a cup-shaped holder provided with an insertion hole 44 having a smaller diameter than that of the outer cylindrical member 14. In this embodiment, the outer cylindrical member 14 needs to be changed in shape. Since the locking claw 22 is provided on the inner peripheral side of the cylindrical main body portion which is press-fitted into the peripheral wall portion 40 of the holder 38, the present invention can be applied to the cup-shaped holder 38. Moreover, since the insertion hole into which the locking claw 22 is locked can use the insertion hole 44 through which the inner shaft member 12 is inserted, it is not necessary to provide a separate mounting hole.

  Further, in the present embodiment, since the stepped portion 18 is partially provided in the circumferential direction, the degree of design freedom of the shape of the main rubber elastic body 16 at the circumferential position where the stepped portion 18 is not provided, and consequently, A large degree of freedom in tuning the vibration isolation characteristics is ensured. In particular, as in the present embodiment, by providing the stepped portions 18 so as to face each other in the radial direction, it is possible to set a sufficiently large spring ratio in two mutually perpendicular directions perpendicular to the axis.

  Further, since the locking claws 22 are partially provided in the circumferential direction, the insertion resistance to the mounting hole (the insertion hole 44) can be reduced as compared with the case where the locking claw 22 is provided annularly over the entire circumference. In particular, by providing the locking claws 22 at equal intervals in the circumferential direction, the locking claw 22 can be inserted into the mounting hole (the insertion hole 44) and the locking mode can be stabilized.

  Furthermore, in the present embodiment, the upper rubber portion 16, the lower portion 34, and the slit hole 36 are provided in the main rubber elastic body 16, so that the free surface area of the main rubber elastic body 16 can be increased. it can. As a result, the degree of freedom in tuning the vibration isolation characteristics and the durability of the rubber elastic body 16 can be improved.

  Although the embodiments of the present invention have been described above, the present invention is not construed as being limited to the specific description in the embodiments, and various changes, modifications, improvements, and the like can be made based on the knowledge of those skilled in the art. Can be implemented.

  For example, in the above-described embodiment, the stepped portion 18, the locking piece 20, and the locking claw 22 are partially formed in the circumferential direction. However, these may be formed over the entire circumference in the circumferential direction. Further, even when the step-shaped portion, the locking piece, and the locking claw are partially formed in the circumferential direction, the present invention is not limited to the embodiment in which a pair is provided to face each other in the radial direction as in the above embodiment. Instead, three or more may be provided in the circumferential direction. In such a case, it is preferable that the step-shaped portions, the locking pieces, and the locking claws are formed at substantially equal intervals in the circumferential direction. In addition, the circumferential dimension of the step-shaped portion, the locking piece, and the locking claw may be different from each other. For example, the step-shaped portion is provided over the entire circumference in the circumferential direction, and the locking piece is the step-shaped portion. May be partially formed in the circumferential direction at the inner peripheral edge portion of the rim.

  In addition, the size and shape of the upper curving portion 32, the lower curling portion 34, the slit holes 36, and the like in the main rubber elastic body 16 can be appropriately changed according to the required vibration isolation characteristics and the like. However, these upper and lower curving portions, slit holes, and the like are not essential in the present invention. Furthermore, at the position where the step-shaped portion 18 is formed, in the above-described embodiment, the lightening portion is constituted by the slit hole 36 that passes through the main rubber elastic body 16 in the axial direction, but the lightening portion has a bottomed bottom. It may have a hole shape.

  Further, in the above-described embodiment, the main rubber elastic body 16 fixed to the lower surface of the step-shaped portion 18 reaches the inner peripheral edge of the step-shaped portion 18. However, it is not necessary. The main rubber elastic body 16 may be made thinner so that it is larger than the inner diameter of the shape portion 18 or the portion where the stepped portion 18 is formed does not substantially exist.

  Furthermore, the cylindrical vibration isolator according to the present invention is not limited to the suspension member mount for a vehicle as in the above embodiment, and may be applied to, for example, an engine mount, a body mount, and a differential mount for a vehicle. It is possible, and it can be applied to a cylindrical vibration isolator other than an automobile.

10: suspension member mount (cylinder vibration isolator), 12: inner shaft member, 14: outer cylinder member, 16: rubber elastic body, 18: stepped portion, 20: locking piece, 22: locking claw, 36: slit hole (lightening portion), 44: insertion hole (mounting hole)

Claims (4)

In a tubular vibration isolator in which an inner shaft member and an outer tubular member are connected by a main rubber elastic body,
A stepped portion extending from one end in the axial direction to the inner peripheral side of the outer cylindrical member made of synthetic resin is provided, and is locked to an opening edge of a mounting hole in which the outer cylindrical member is mounted. A locking piece provided with a locking claw to be protruded axially outward from the stepped portion.   2. The cylindrical vibration isolator according to claim 1, wherein the stepped portion provided with the locking piece is partially provided in a circumferential direction of the outer cylindrical member. 3.   The cylindrical vibration isolator according to claim 2, wherein a pair of the stepped portions provided with the locking pieces are provided so as to face each other in a direction perpendicular to an axis of the outer cylindrical member.   The cylinder according to any one of claims 1 to 3, wherein the main rubber elastic body is formed with a hollow portion that opens axially outward through the gap between the stepped portion and the inner shaft member. Type anti-vibration device.

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