JP2010216513A - Vibration control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cylindrical vibration control device capable of improving adhesion durability while securing moldability. <P>SOLUTION: The vibration control device 10 includes an inner cylinder member 12 having an swelling part 18 on an axial central part, an outer cylinder member 14 having a flange 20 on an axial one end part, and a vibration control base body 16 made of a rubber elastic body and connecting the both members, wherein an axial direction X is a main load input direction. A stopper rubber part 24 made of the rubber elastic body continued from the vibration base control body is formed on an axial outer side surface 20A of the flange 20, an injection port 26 of a rubber material is formed on an axial end surface 16A of the vibration control base body on the flange side, and the injection port is set in a position separated to a radial inward Ki side from a radial inner side surface 24B of the stopper rubber part and in a position on a radial outward Ko side of the swelling part 18 of the inner cylinder member. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a cylindrical vibration isolator in which an antivibration base made of a rubber elastic body is interposed between an inner cylinder member and an outer cylinder member.

  Conventionally, when a vehicle differential (differential device) is attached to a vehicle body, the above-described cylindrical vibration isolator called a diff mount is provided between the differential case and the vehicle body, and the differential case is attached to the vehicle body. May support vibration isolation.

  For example, Patent Literature 1 below discloses an inner cylinder member, an outer cylinder member that is coaxially surrounded by the inner cylinder member, and is press-fitted into a mounting hole of a differential case, and the inner cylinder member and the outer cylinder member. There has been disclosed a cylindrical vibration isolator provided with a vibration isolating base made of a rubber elastic body that is vulcanized and bonded to a cylindrical member to connect them. A flange portion that extends radially outward is provided at one axial end portion of the outer cylinder member, and a stopper rubber portion that exerts a stopper action with respect to the vehicle body side member is provided on the outer surface in the axial direction of the flange portion. It is provided by a rubber elastic body continuous from the base.

Further, in Patent Document 2 below, as used as a member mount in a suspension of an automobile, a cylindrical vibration isolator having a configuration in which a stopper rubber portion is provided on a flange portion of an outer cylinder member, as described above, The thing which provided the bulging part which bulged to the radial direction outer side in the axial direction center part of the cylinder member is disclosed.
JP 2004-028250 A JP 2001-012548 A

  In the above-mentioned vibration isolator, the vibration isolator base is formed by applying an adhesive to the outer peripheral surface of the inner cylinder member and the inner peripheral surface of the outer cylinder member, setting them in the mold, and then putting the rubber material in the mold. It is vulcanized and molded by pouring and vulcanized and bonded to the outer peripheral surface of the inner cylinder member and the inner peripheral surface of the outer cylinder member. When the flange portion is provided on the outer cylinder member as described above, the end of the outer cylinder member on the side where the flange portion is provided is on the upper side in consideration of the setting property of the outer cylinder member to the mold. It is preferable to set in a mold. If it does so, the inlet part of rubber | gum material will be provided in the end surface by the side of a flange part among the axial direction both ends of a vibration-proof base.

  Since the flange portion is provided with the stopper rubber portion connected to the vibration-proof base as described above, when the injection port portion is provided at a position close to the outer cylinder member in the radial direction, the gap between the injection port portion and the stopper rubber portion is provided. The moldability is impaired, for example, the thickness of the mold portion becomes thin and the strength of the mold becomes difficult to secure.

  On the other hand, when the injection port portion is set at a position close to the inner cylinder member in the radial direction, when the bulge portion is provided in the inner cylinder member, the bulge is caused by the injection pressure of the rubber material injected from the injection port portion. The adhesive applied to the surface of the part is peeled off, and the durability after vulcanization molding is impaired. In particular, when the main load input direction is the axial direction as in the case of a diff mount, the endurance breakage between the inner cylinder member and the vibration isolating substrate is likely to occur due to the shear deformation of the vibration isolating substrate, and the adhesive is peeled off. Ensuring durability becomes even more difficult.

  In view of the above, an object of the present invention is to provide a cylindrical vibration isolator capable of improving adhesion durability while ensuring moldability.

  An anti-vibration device according to the present invention includes an inner cylinder member having a bulging portion bulging radially outward at an axially central portion, and a mounted member having a cylindrical shape surrounding the inner cylindrical member coaxially. An outer cylindrical member that has a flange portion that is press-fitted into the mounting hole and that extends radially outward at one end in the axial direction, an outer peripheral surface including the bulging portion of the inner cylindrical member, and the outer cylinder An anti-vibration base made of a rubber elastic body that is vulcanized and bonded to the inner peripheral surface of the member to connect the inner cylinder member and the outer cylinder member, and the axial direction is a main load input direction. is there. A stopper rubber portion that exerts a stopper action with respect to a member fixed to one axial end portion of the inner cylinder member is provided on the outer surface in the axial direction of the flange portion by a rubber elastic body continuous from the vibration-proof base. It has been. Further, an injection port portion of a rubber material for molding the vibration isolation substrate is provided on an axial end surface of the vibration isolation substrate on the flange portion side, and the injection port portion is disposed in the radial direction of the stopper rubber portion. The position is set at a position spaced radially outward from the side surface and at a position radially outward from the bulging portion of the inner cylinder member.

  Thus, the injection port portion of the rubber material for molding the vibration-proof base is provided so as to be spaced from the radially inner side surface of the stopper rubber portion on the outer cylinder member side to the radially inner side. The thickness of the mold part between the parts can be sufficiently ensured, and the strength of the mold can be ensured. Further, since the injection port portion is provided on the radially outer side of the bulging portion of the inner cylinder member, it is applied to the surface of the bulging portion by the injection pressure of the rubber material injected from the injection port portion. In addition, it is possible to reduce the problem that the adhesive is peeled off, that is, it is possible to easily spread the rubber material to the entire inside of the mold without peeling off the adhesive, and to improve the durability after vulcanization molding. Therefore, adhesion durability can be improved while ensuring moldability.

  In the vibration isolator, it is preferable that an annular plate that is disposed in contact with the axial end surface of the peripheral edge portion of the mounting hole is welded and fixed to the inner side surface in the axial direction of the flange portion.

  As shown in Patent Document 1, in the conventional vibration isolator, a relatively large clearance is secured in the axial direction between the stopper rubber portion and the member to which the inner cylinder member is fixed. Thus, when the stopper clearance is large, the deflection suppression with respect to the axial displacement in the relatively low amplitude region becomes insufficient. In order to solve this problem, if the stopper clearance is reduced by increasing the size of the stopper rubber part, such as by increasing the height of the stopper rubber part, the axial deflection cannot be sufficiently suppressed. As a means for reducing the stopper clearance, for example, it is conceivable to increase the height of the attached member into which the outer cylinder member is press-fitted. However, increasing the attached member side increases the weight. On the other hand, by fixing the annular plate to the flange portion of the outer cylinder member as described above, the stopper clearance can be reduced by increasing the plate thickness of the flange portion while suppressing a significant increase in weight. Axial deflection can be effectively suppressed.

  With the vibration isolator of the present invention, adhesion durability can be improved while ensuring moldability.

The top view of the vibration isolator which concerns on embodiment II-II sectional view of FIG. 2 is an enlarged cross-sectional view of the main part of FIG. Sectional drawing which shows the assembly | attachment state of the vibration isolator Cross section of the vibration isolator during vulcanization molding

  A vibration isolator 10 according to an embodiment of the present invention will be described below with reference to FIGS.

  The vibration isolator 10 is a differential mount that connects between a differential case of an automobile and a vehicle body thereabove, an inner cylinder member 12, an outer cylinder member 14 that surrounds the same in a coaxial manner, these cylinder members 12, 14 is a cylindrical mount provided with an anti-vibration base 16 made of a rubber elastic body interposed between 14.

  The inner cylinder member 12 is a metal cylindrical member, and has a bulging portion 18 that bulges radially outward Ko (that is, outward in the direction perpendicular to the axis) at the center in the axial direction X. In the cross-sectional shape shown in FIG. 2, the bulging portion 18 includes a straight cylindrical portion 18A having a constant outer diameter and a thick wall, and inclined surface portions 18B and 18B provided at both ends in the axial direction X of the straight cylindrical portion 18A. A trapezoidal shape is formed, and the inner cylinder member 12 is formed with a constant cross section over the entire circumference. Thus, by providing the bulging part 18 in the center part of the axial direction X and making it a large diameter part, the both ends of the axial direction X were made into the small diameter part 19, and while aiming at weight reduction, the axial direction X and diameter The spring constant in the direction (direction perpendicular to the axis) K can be set high.

  The outer cylinder member 14 is a metallic cylindrical member, and an annular flange portion 20 that extends radially outwardly at one end portion in the axial direction X is bent over the entire circumference. The outer cylinder member 14 is a press-formed product of a metal plate, and has a constant thickness throughout. The axial dimension of the outer cylinder member 14 is shorter than the inner cylinder member 12 as shown in FIG. 2, and both end portions of the inner cylinder member 12 are axially outward Xo from both ends in the axial direction X of the outer cylinder member 14. The small diameter portion 19 is set so as to protrude. The outer cylinder member 14 is formed so as to surround the bulging portion 18 of the inner cylinder member 12 over the entire axial direction X.

  The anti-vibration base 16 is vulcanized and bonded to the outer peripheral surface 12A including the bulging portion 18 of the inner cylindrical member 12 and the inner peripheral surface 14A of the outer cylindrical member 14 facing the outer peripheral surface. It is a rubber member that connects between the member 12 and the outer cylinder member 14.

  In this example, the anti-vibration base 16 does not have a piercing that penetrates in the axial direction X over the entire circumference in the circumferential direction, and is formed in a cylindrical shape having a constant cross section over the entire circumference. The anti-vibration base 16 is provided so as to cover not only the straight cylindrical portion 18A of the bulging portion 18 but also the inclined surface portions 18B on both sides in the axial direction X. Both end surfaces 16A and 16B in the axial direction of the vibration isolating base 16 are formed as concave surfaces that are recessed in a cross-sectional curved shape toward the inner side Xi in the axial direction.

  The axially outer side surface 20A (upper surface in FIG. 2) of the flange portion 20 of the outer cylinder member 14 is subjected to deflection control, that is, a stopper action, with the vehicle body side member 22 fixed to the upper end portion of the inner cylinder member 12. A stopper rubber part 24 is provided. The stopper rubber portion 24 is provided by a rubber elastic body continuous from the vibration isolation base 16, that is, the stopper rubber portion 24 is formed by rubber continuously provided outward from the outer peripheral edge at the upper end portion of the vibration isolation base 16. Has been. The stopper rubber portion 24 is vulcanized and bonded to the axially outer side surface 20A of the flange portion 20. In this example, the stopper rubber portion 24 has a constant height throughout the circumferential direction, and the upper surface 24A is formed flat.

  The anti-vibration base 16 is formed by injecting a rubber material into a mold and vulcanizing and molding, as shown in FIGS. 1 and 2, the flange portion of the axial end faces 16A and 16B. An injection port portion 26 for injecting a rubber material is provided on the axial end surface 16A (upper surface in FIG. 2) on the 20 side. As shown in FIG. 1, the injection port portion 26 is provided at one place in the circumferential direction of the vibration isolation base 16.

  As shown in FIG. 2, the injection port portion 26 is a position spaced from the radially inner side surface 24 </ b> B (that is, the inner peripheral surface) of the stopper rubber portion 24 toward the radially inward Ki side, and the inner cylinder member 12. The bulging portion 18 is set at a position on the radially outward Ko side. That is, as shown in an enlarged view in FIG. 3, a predetermined gap G is secured in the radial direction K between the radial inner side surface 24 </ b> B of the stopper rubber portion 24 and the injection port portion 26. Further, the injection port portion 26 is provided on the outer side Ko in the positional relationship in the radial direction K with respect to the outer peripheral surface of the straight cylindrical portion 18A which is the radially outermost end of the bulging portion 18 of the inner cylindrical member 12. The rubber material injected from the injection port portion 26 is set so as not to directly contact the inclined surface portion 18B of the bulging portion 18 with a high injection pressure. The inlet portion 26 is provided in the vicinity of the deepest portion (that is, the bottom portion) of the concave surface portion on the axial end surface 16A of the vibration-proof base 16 having the concave surface shape.

  As shown in FIG. 2, an annular plate 28 is welded and fixed to the axial inner side surface 20 </ b> B (the lower surface in FIG. 2) of the flange portion 20 of the outer cylinder member 14. As described above, the outer cylinder member 14 is made of a metal member having a constant thickness. However, by welding the metal annular plate 28 to the axially inner side surface 20B of the flange portion 20, the plate thickness is increased only in the flange portion 20. Is set. The annular plate 28 is a ring-shaped plate material that overlaps substantially the entire axial inner side surface 20B of the flange portion 20, and in this example, a plate material having a plate thickness substantially the same as the thickness of the flange portion 20 is used.

  Even when the annular plate 28 is provided on the axially outer side surface 20A (the upper surface in FIG. 2) of the flange portion 20, the plate thickness of the flange portion 20 can be increased. In this case, a stopper is provided so as to cover the annular plate. When the rubber part is vulcanized and bonded, and the stopper rubber part is subjected to compressive deformation, there is a risk that durability is impaired at the step part between the annular plate and the flange part. Therefore, the annular plate 28 is provided on the axially inner side surface 20B as described above.

  As shown in FIG. 4, the vibration isolator 10 according to the present embodiment configured as described above is configured such that the outer cylinder member 14 is press-fitted and fitted into the mounting hole 32 provided in the differential case 30 that is a member to be attached. It is fixed to the 30 side. Further, the inner cylinder member 12 is fixed to the vehicle body side by fastening with the lower mounting plate 36 to the upper vehicle body side member 22 with the mounting bolt 34 inserted through the hollow portion of the inner cylindrical member 12. . Thereby, the differential case 30 and the vehicle body side member 22 above it are elastically connected via the vibration isolator 10, and the vibration isolator 10 has the axial direction X as the vertical direction, and the vertical direction is Main load input direction.

  The outer cylindrical member 14 is fitted and held on the inner peripheral surface of the mounting hole 32 of the differential case 30 over the entire outer circumferential surface in the axial direction X. An annular plate 28 fixed to the axial inner side surface 20B of the flange portion 20 is disposed in contact with the axial end surface 30A (upper surface) of the peripheral edge portion of the mounting hole 32.

  A minute gap is provided in the axial direction X between the stopper rubber portion 24 provided on the axially outer side surface 20A of the flange portion 20 and the vehicle body side member 22 provided thereabove. The dynamic spring constant in the region is set to be low.

  A disk-shaped stopper rubber plate 38 made of a rubber elastic body is fitted and fixed to the small diameter portion 19 on the lower end side of the inner cylinder member 12. The stopper rubber plate 38 is disposed on the mounting plate 36 fixed to the lower end surface of the inner cylinder member 12 and exerts a stopper action between the lower peripheral edge portion of the mounting hole 32 of the differential case 30. A minute gap is provided in the axial direction X between the lower peripheral edge.

  When manufacturing the vibration isolator 10, an adhesive is applied to the outer peripheral surface 12A of the inner cylindrical member 12 and the inner peripheral surface 14A of the outer cylindrical member 14 to which the annular plate 28 is welded. As shown in FIG.

  Since the outer cylinder member 14 has the flange portion 20 as described above, it is set in the molding die 40 with the flange portion 20 facing upward in consideration of ease of setting in the molding die. Therefore, the molding die 40 supports the lower end of the inner cylinder member 12, supports the outer periphery of the outer cylinder member 14 over the entire axial direction X, and supports the upper end of the inner cylinder member 12. An upper die 46 that forms a cavity 44 into which a rubber material is injected with the lower die 42 by contacting the peripheral edge of the axially outer side surface 20A of the flange portion 20 of the cylindrical member 14 is provided. A rubber material inlet 26 for molding the vibration isolation base 16 is provided on the mold surface of the upper mold 46 that forms the axial end surface 16A on the upper side of the vibration isolation base 16. A rubber material channel 48 connected to the inlet 26 is provided.

  After the inner cylinder member 12 and the outer cylinder member 14 are set in the mold 40, the mold is clamped as shown in FIG. 5, and then a rubber material is injected and filled into the cavity 44 from the injection port portion 26 to prevent vibration. The substrate 16 is vulcanized. As a result, the vibration-proof base 16 is molded in a state of being vulcanized and bonded to the outer peripheral surface 12A of the inner cylindrical member 12 and the inner peripheral surface 14A of the outer cylindrical member 14. The vulcanized molded body thus obtained is then subjected to a drawing process on the outer cylinder member 14 to reduce the diameter of the outer cylinder member 14, thereby obtaining the vibration isolator 10 shown in FIG.

  According to the present embodiment as described above, the injection port portion 26 of the rubber material for molding the vibration isolating base 16 is provided so as to be separated from the radially inner side surface 24B of the stopper rubber portion 24 toward the radially inward Ki side. The thickness of the mold portion 50 (see FIG. 5) between the inlet portion 26 and the stopper rubber portion 24 can be sufficiently secured. Therefore, the strength of the mold 40 can be ensured.

  Further, since the injection port portion 26 is provided on the radially outer side Ko from the bulging portion 18 of the inner cylinder member 12, the bulging portion is caused by the injection pressure of the rubber material injected from the injection port portion 26. The trouble that the adhesive applied to the surface of 18 peels can be reduced. That is, if the injection port portion 26 is provided at a position overlapping the bulging portion 18 in the radial direction K, the rubber material injected from the injection port portion 26 is inclined by the bulging portion 18 with a high injection pressure. There is a possibility that the adhesive applied to the inclined surface portion 18B may come off due to hitting the surface portion 18B, but by arranging the injection port portion 26 as described above, the rubber material of the mold 40 is removed without removing the adhesive agent. Durability after vulcanization molding can be improved by making it easy to spread throughout the interior. Therefore, adhesion durability can be improved while ensuring moldability.

  According to the present embodiment, since the annular plate 28 is welded to the flange portion 20 of the outer cylinder member 14 to increase the plate thickness of the flange portion 20, the stopper clearance with the vehicle body side member 22 is accordingly increased. Is reduced, and the deflection in the axial direction X can be effectively suppressed. In addition, in this case, the thickness of the flange portion 20 is increased, and the differential case 30 that is a member to be attached does not need to be changed without changing the depth of the mounting hole 32, so that the weight increases significantly. Deflection can be suppressed while suppressing the above.

  In the above-described embodiment, the anti-vibration base 16 has a structure that does not have a straight portion penetrating in the axial direction X, but the present invention is also applied to a structure having such a straight portion in the circumferential direction. Is possible. Moreover, in the said embodiment, although the height of the stopper rubber part 24 was made constant in the circumferential direction, about the thing from which the height of a stopper rubber part differs in the circumferential direction, such as providing a recessed part in the circumferential direction, The present invention is applicable. Although not enumerated one by one, various modifications can be made without departing from the spirit of the present invention.

  The present invention can be used for various types of cylindrical vibration isolators including, for example, automobile differential mounts, body mounts, member mounts, and the like.

DESCRIPTION OF SYMBOLS 10 ... Vibration isolator 12 ... Inner cylinder member, 12A ... Outer peripheral surface 14 ... Outer cylinder member, 14A ... Inner peripheral surface 16 ... Anti-vibration base | substrate, 16A ... Axial end surface 18 on the flange part side ... Bulging part 20 ... Flange part , 20A ... axially outer side surface, 20B ... axially inner side surface 22 ... vehicle body side member (member fixed to one axial end portion of the inner cylinder member)
24 ... Stopper rubber part, 24B ... Radial inner surface 26 ... Injection port part 28 ... Annular plate 30 ... Differential case (attached member), 30A ... Axial end face, 32 ... Mounting hole X ... Axial direction, Xo ... Axial direction Outward, Xi ... axially inward K ... radial, Ko ... radially outward, Ki ... radially inward

Claims (2)

An inner cylinder member having a bulging portion bulging radially outward in an axially central portion;
An outer cylinder member that has a cylindrical shape that surrounds the inner cylinder member coaxially and is press-fitted into a mounting hole of the attached member, and has a flange portion that extends radially outward at one axial end portion; ,
Anti-vibration comprising a rubber elastic body that is vulcanized and bonded to the outer peripheral surface including the bulging portion of the inner cylindrical member and the inner peripheral surface of the outer cylindrical member, and connects the inner cylindrical member and the outer cylindrical member. A substrate;
In a vibration isolator having the axial direction as a main load input direction,
A rubber stopper is provided on the outer surface of the flange portion in the axial direction to provide a stopper rubber portion that exerts a stopper action with respect to a member fixed to one end portion of the inner cylinder member in the axial direction. ,
A rubber material injection port for molding the vibration isolation base is provided on an axial end surface of the vibration isolation base on the flange portion side, and the injection port is formed from a radially inner side surface of the stopper rubber portion. A position spaced radially inward and set to a position radially outward from the bulging portion of the inner cylinder member;
An anti-vibration device characterized by that. An annular plate arranged in contact with the axial end surface of the peripheral edge of the mounting hole is welded and fixed to the inner side surface in the axial direction of the flange portion.
The vibration isolator according to claim 1.

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