JP2008100627A - Vibration-isolating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vibration-isolating device capable of mounting a guide cone to be temporarily mounted on an upper surface of a rebound stopper during the assembly to a vehicle body without increasing the cost or the weight. <P>SOLUTION: A rebound stopper 26 to be expanded above an outer piece 14 from an upper end of an inner cylindrical piece 12 is provided; a stopper receiving part 38 for receiving the rebound stopper 26 is provided on the outer piece 14 over the entire circumference; and a stopper rubber part 44 to the rebound stopper 26 is vulcanization-formed on an upper surface of the stopper receiving part 38 over the entire circumference. A plurality of downwardly recessed parts 40 are provided in the circumferential direction of the stopper receiving part 38, and a plurality of recesses 50 are formed in an upper surface of the stopper rubber part 44 in the circumferential direction C corresponding to the recessed parts 40. Spaces 76 in which a locking claw 9a of a guide cone 9 is inserted in a full rebound state during the assembly to a vehicle body are formed of the recesses 50. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a vibration isolator for elastically coupling a piston rod of a shock absorber in a suspension mechanism of a vehicle such as an automobile to a vehicle body.

  Conventionally, this type of vibration isolator is composed of an inner cylinder fitting to which the upper end of a piston rod of a shock absorber is inserted and fixed from below, and an outer side surrounding the outer circumference of the inner cylinder fitting around the mounting hole of the vehicle body panel. And an anti-vibration base made of a rubber-like elastic body that is interposed between these metal fittings and couples them together.

Then, a rebound stopper is provided to protrude from the upper end of the inner tube bracket to the upper side of the outer bracket, a stopper receiving portion for receiving the rebound stopper is provided over the entire circumference of the outer bracket, and a stopper rubber portion is provided on the upper surface of the stopper receiving portion. There is known a configuration in which a shock absorber portion absorbs an impact when the rebound stopper is received by a stopper receiving portion (see Patent Document 1 below).
JP 2004-150497 A

  When this type of vibration isolator is assembled to the vehicle body, it is mounted from below on the mounting hole of the vehicle body panel in a state of being integrally assembled together with the shock absorber and the coil spring surrounding the shock absorber. At that time, in order to align the vibration isolator and the mounting hole of the vehicle body panel, a triangular cone-shaped guide cone is temporarily mounted on the rebound stopper located at the upper end of the vibration isolator, and the guide cone It is advantageous to insert it into the mounting hole from below while guiding it.

  At the time of such assembly, the shock absorber fixed to the inner cylinder fitting side of the vibration isolator is restricted in its structure from extending over a predetermined amount, whereas the coil spring has no such restriction means. In the case where the upper end of the coil spring is received and supported by the outer metal fitting, the spring is fully rebounded (ie, the rebound stopper is closest to the stopper receiving part) by the biasing force of the coil spring. .

  In such a full rebound state, the lower surface of the rebound stopper is in full contact with the stopper rubber part over the entire circumference, so that the guide cone attached to the upper surface of the rebound stopper rebounds with the locking claw on the lower surface. It cannot be sunk into the lower surface of the stopper. For this reason, in order to attach the guide cone to the rebound stopper, it is necessary to provide an engagement fitting with which the locking claw of the guide cone engages on the upper surface of the rebound stopper, leading to an increase in cost and product weight.

  The present invention has been made in view of the above points, and the guide cone temporarily attached to the upper surface of the rebound stopper at the time of assembly to the vehicle body is not accompanied by an increase in cost or weight, and the rebound stopper An object of the present invention is to provide an anti-vibration device that can be mounted without changing characteristics.

An anti-vibration device according to the present invention includes an inner cylinder fitting in which an upper end portion of a piston rod of a shock absorber is inserted and fixed from below, and an outer fitting that surrounds the outer periphery of the inner cylinder fitting. An outer metal fitting that is attached and fixed from the lower surface side around the shock absorber and receives an upper end portion of a coil spring that surrounds the shock absorber, and a rubber that is interposed between the inner cylinder metal fitting and the outer metal fitting to couple the two metal fittings An anti-vibration device comprising an anti-vibration base made of a cylindrical elastic body,
The inner cylinder fitting includes a rebound stopper that projects from the upper end of the inner cylinder fitting to the upper side of the outer fitting,
The outer metal fitting is provided with a stopper receiving portion for receiving the rebound stopper over the entire circumference of the outer metal fitting, and a stopper rubber portion for the rebound stopper is vulcanized over the entire upper surface of the stopper receiving portion,
The stopper receiving portion is provided with depressed portions that are depressed downward at a plurality of locations in the circumferential direction, and a plurality of concave portions are provided in the circumferential direction corresponding to the depressed portions on the upper surface of the stopper rubber portion,
It has the configuration.

  According to the above configuration, when assembled to the vehicle body, the rebound stopper is pressed against the stopper rubber portion by the biasing force of the coil spring, and a full rebound state is obtained. At this time, since the general portion where the recessed portion in the stopper receiving portion is not provided is limited to a predetermined displacement or more of the rebound stopper, the recessed portion is provided with a recess on the upper surface of the stopper rubber portion, Even in such a full rebound state, a gap can be secured between the lower surface of the rebound stopper. Therefore, by using this gap as a gap into which the locking claw of the guide cone enters, it is possible to attach the guide cone to the rebound stopper, so there is no longer any need to provide a separate engagement fitting on the upper surface of the rebound stopper. The guide cone can be attached without increasing the cost and weight.

  In addition, as described above, recessed portions are provided at a plurality of locations in the circumferential direction, and the stopper function can be secured at other general portions, so that the guide cone mounting structure is incorporated without changing the characteristics of the rebound stopper. be able to. In addition, when a recess is provided only in the stopper rubber part without providing a depressed part on the stopper receiving part of the outer metal fitting, a full rebound is required unless the depth of such a recess made only by rubber is sufficiently large. It will collapse in the state. Therefore, it is effective to provide a recessed portion in the stopper rubber portion on the stopper receiving portion after providing the depressed portion in the stopper receiving portion.

  In the present invention, the stopper rubber portion includes an annular base provided on the entire upper surface of the stopper receiving portion, and a plurality of stopper rubber portions protruding upward from the upper surface of the base and distributed in the circumferential direction of the base. It is preferable that the concave portion is provided at a plurality of locations in the circumferential direction on the upper surface of the base portion so as to correspond to the depressed portion.

  In this case, at the time of assembly to the vehicle body, the stopper convex portion is crushed by the rebound stopper and the base portion is also compressed, but the base portion is restricted from being compressed more than a predetermined amount by the general portion of the stopper receiving portion, so Rebound state. At this time, the recess provided on the upper surface of the base portion corresponding to the depressed portion can secure a gap with the lower surface of the rebound stopper even in the full rebound state. It can be used as a gap to enter. Also, in this case, when a rebound is input when the vehicle travels, the stopper convex portion is compressed first, and then the base portion is compressed, so that the initial spring constant is reduced, noise generation and riding comfort are reduced. Deterioration can be suppressed.

  In the present invention, the stopper convex portion is provided on the upper surface of the base portion along the first stopper convex portion provided between the concave portions adjacent in the circumferential direction and the radially outer side of the concave portion. You may comprise with the made 2nd stopper convex part. In this case, the first stopper convex portion provided between the concave portion and the concave portion is provided on the general portion of the stopper receiving portion, and the second stopper convex portion provided along the outer side of the concave portion is provided on the stopper receiving portion. Since the height of the stopper receiving part that supports the stopper rubber part is different on the recessed part, the spring constant can be gradually increased when rebound input occurs, generating abnormal noise and riding comfort Excellent in suppressing the decrease of

  With the vibration isolator of the present invention, the guide cone temporarily attached to the upper surface of the rebound stopper when assembled to the vehicle body, without increasing the cost and weight, and without changing the characteristics of the rebound stopper, It can be attached and is excellent in assembling work to the car body.

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

  FIG. 1 shows a cross-sectional view of a state in which a vibration isolator 10 according to an embodiment of the present invention is assembled to a vehicle body. As shown in the figure, the vibration isolator 10 is an upper support (strut mount) for elastically coupling an upper end portion 1a of a piston rod 1 of a shock absorber in a vehicle suspension mechanism to a vehicle body panel 2. The axial direction of the piston rod 1 is provided as a vertical direction X.

  The vibration isolator 10 is mounted and fixed from the lower surface 2a side around the mounting hole 3 of the vehicle body panel 2 surrounding the outer periphery of the inner cylinder fitting 12 to which the upper end 1a of the piston rod 1 is inserted and fixed from below. A coil spring comprising an outer metal fitting 14 and a vibration-proof base 16 made of a rubber-like elastic body interposed between the inner cylinder metal fitting 12 and the outer metal fitting 14 to couple them together. 8 has a structure in which the upper end portion 8a is received and supported by the outer metal fitting 14.

  The inner cylinder fitting 12 includes a cylindrical first inner cylinder member 18 having an anti-vibration base 16 vulcanized and bonded to the outer peripheral surface, and a bottomed cylindrical second member press-fitted inside the first inner cylinder member 18. It consists of the inner cylinder member 20 and the third inner cylinder member 22 in the shape of a saddle that is fixed to the second inner cylinder member 20 on the bottom surfaces of each other. And the through-hole 24 in which the volt | bolt 4 of the upper end part 1a of the piston rod 1 is penetrated is provided in the overlapping part 23 of the bottom surfaces of the 2nd inner cylinder member 20 and the 3rd inner cylinder member 22, This through-hole A bolt 4 inserted from below into 24 is fastened and fixed by a nut 5.

  The second inner cylinder member 20 of the inner cylinder fitting 12 is provided with a rebound stopper 26 that projects from the upper end portion 20a to the upper side of the outer fitting 14. In this example, the rebound stopper 26 is bent in a flange shape from the upper end opening edge of the bottomed cylindrical second inner cylinder member 20 toward the radially outer side Y1, and the entire circumference of the second inner cylinder member 20 is formed. It is provided in a ring plate shape. The rebound stopper 26 is provided with an insertion hole 27 penetrating in a vertical direction at a position corresponding to a concave portion 50 of a stopper rubber portion 44 described later.

  The outer metal fitting 14 includes an upper first outer member 28 fixed to the lower surface 2a of the vehicle body panel 2, and a lower second outer member 30 arranged on the lower surface thereof.

  The first outer member 28 is vulcanized and bonded to the outer peripheral portion of the vibration-isolating base 16, and extends from the lower end of the first cylindrical portion 32 in the radially outward direction Y <b> 1. And a mounting plate portion 34 arranged on the lower surface 2a.

  The first cylindrical portion 32 is formed in a tapered cylindrical shape having a smaller diameter toward the upper side, and as shown in FIGS. 5 to 8, the first cylindrical portion 32 is recessed in the radially inward Y2 at a plurality of circumferential positions (here, three positions). A recessed portion 36 is provided and reinforced. A stopper receiving portion 38 that receives the rebound stopper 26 is bent in the first cylindrical portion 32 from the upper end portion of the first cylindrical portion 32 in the radially inward direction Y2.

  The stopper receiving portion 38 is provided in a ring plate shape over the entire circumference of the first cylindrical portion 32, and recessed portions 40 that are recessed downward X <b> 1 are provided at a plurality of locations in the circumferential direction C. The depressed portion 40 is formed by dropping the horizontal annular upper surface of the stopper receiving portion 38 into the lower portion X1 within a predetermined range in a part of the circumferential direction, and a plurality of depressed portions 40 are provided at equal intervals in the circumferential direction C. In this example, it is provided at three positions every 120 °. The general portion 42 provided with no depressed portion 40 in the stopper receiving portion 38 is formed with a constant height in the circumferential direction C, and the amount of depression of the depressed portion 40 with respect to the general portion 42 is a full rebound state described later. In this example, a necessary minimum gap is secured between the recess 50 and the rebound stopper 26. In this example, the thickness is set to about 2 mm, which is equivalent to the thickness of the stopper receiving portion 38.

  A stopper rubber portion 44 for the rebound stopper 26 is vulcanized on the upper surface of the stopper receiving portion 38. As shown in FIGS. 2 and 4, the stopper rubber portion 44 protrudes upward X2 from the annular base portion 46 provided on the entire upper surface of the stopper receiving portion 38 and the upper surface 46 a of the base portion 46, and the circumferential direction of the base portion 46. It consists of a plurality of stopper projections 48 distributed in C. The stopper rubber portion 44 is provided so as to cover not only the upper surface of the stopper receiving portion 38 but also the outer peripheral surface of the first cylindrical portion 32 over the entire circumference, and is vulcanized and molded by rubber continuous from the vibration-isolating base 16. .

  A plurality of concave portions 50 are provided in the circumferential direction C on the upper surface 46 a of the base portion 46 of the stopper rubber portion 44 so as to correspond to the depressed portion 40 of the stopper receiving portion 38. In other words, the horizontal upper surface 46 a of the base portion 46 falls to the lower portion X <b> 1 as much as the depressed portion 40 is depressed at the circumferential position where the depressed portion 40 is provided, and this depressed portion is formed as the concave portion 50. . Accordingly, in this example, the concave portions 50 are arranged at three equal intervals in the circumferential direction C of the stopper rubber portion 44. As shown in FIGS. 2 and 4, the recess 50 is formed in an arc shape along the circumferential direction C, and is provided close to the radially inner Y2 side of the upper surface 46 a of the base 46.

  The stopper convex portion 48 is formed on the upper surface 46a of the base portion 46 along the first stopper convex portion 48a provided between the concave portions 50 and 50 adjacent to each other in the circumferential direction C, and the radially outward Y1 side of the concave portion 50. The second stopper convex portion 48b is provided.

  In this example, the first stopper convex portion 48a is composed of two types of stopper convex portions 48a-1 and 48a-2, and both are provided at equal intervals in the circumferential direction C (in this example, at three positions every 120 °). It has been. The higher stopper protrusion 48 a-1 protrudes upward X <b> 2 from the upper surface 46 a of the base 46, protrudes upward X <b> 2 from the upper surface of the first protrusion 52, and is higher than the first protrusion 52. It consists of the 2nd convex part 54 with a narrow width | variety in radial direction Y. The lower stopper protrusion 48 a-2 protrudes upward X <b> 2 from the upper surface 46 a of the base 46, protrudes upward X <b> 2 of the third protrusion 56, and is more radial than the third protrusion 56. It consists of the 4th convex part 58 with a narrow width | variety in Y.

  As shown in FIG. 4, the first protrusion 52 and the third protrusion 56 are set to have the same protrusion amounts H <b> 1 and H <b> 3 from the upper surface 46 a of the base 46. The protruding amount H2 of the second protruding portion 54 from the upper surface of the first protruding portion 52 is set larger than the protruding amount H4 of the fourth protruding portion 58 from the upper surface of the third protruding portion 56, and the second protruding portion. The upper surface of 54 is configured to be positioned above X <b> 2 above the upper surface of the fourth convex portion 58. Further, the protruding amount H0 of the second stopper convex portion 48b from the upper surface 46a of the base portion 46 is set to be the same as the protruding amount H1 of the first convex portion 52 from the upper surface 46a of the base portion 46.

  As shown in FIG. 1, the second outer member 30 includes a second cylindrical portion 60 that is vulcanized and bonded to the outer peripheral portion of the vibration-proof base 16, and extends radially outward from the upper end of the second cylindrical portion 60. A mounting plate portion 62 that is fixedly provided on the lower surface of the mounting plate portion 34 of the first outer member 30 and a bound-side stopper receiving portion that is bent from the lower end of the second cylindrical portion 60 in the radially outward direction Y1. 64.

  The second cylindrical portion 60 has a straight cylindrical shape with a constant diameter in the axial direction X, and is formed with a smaller diameter than the first cylindrical portion 32.

  Both the mounting plate portion 34 of the first outer member 28 and the mounting plate portion 62 of the second outer member 30 have a rounded triangular shape in plan view (see FIG. 5). The bolt 6 is inserted into the through hole 66 and tightened with the nut 7 so as to be fastened and fixed to the vehicle body panel 2.

  The bounce-side stopper receiving portion 64 receives the displacement of the bounce-side stopper portion 68 provided on the outer peripheral portion of the third inner cylindrical member 22 to the upper X2 and exhibits a bounce-side stopper action. On the lower surface of the side stopper receiving portion 64, a bound side stopper rubber portion 70 provided continuously from the vibration isolating base 16 is vulcanized. As shown in FIGS. 3 and 4, a plurality of rib-like protrusions 72 extending in the radial direction Y are distributed in the circumferential direction on the contact surface with the bound side stopper portion 68 which is the lower surface of the bound side stopper rubber portion 70. It suppresses abnormal noise at the time of bouncing.

  On the lower surface of the mounting plate portion 62 of the second outer member 30, a spring receiving portion 74 that receives and supports the upper end portion 8 a of the coil spring 8 that surrounds the shock absorber is vulcanized by rubber continuously provided from the vibration-isolating base 16. ing.

  When the vibration isolator 10 having the above structure is assembled to the vehicle, the inner cylinder fitting 12 is fixed to the upper end 1a of the piston rod 1, and the upper end 8a of the coil spring 8 is supported by the spring receiving portion 74 of the outer cylinder fitting 14. The shock absorber, the coil spring 8 and the vibration isolator 10 are assembled together by receiving and supporting them.

  In this state, as shown in FIG. 9, the triangular cone-shaped guide cone 9 is attached to the upper surface of the rebound stopper 26. Locking claws 9 a are projected from the lower surface of the guide cone 9. In this example, the locking claws 9 a are provided at three locations in the circumferential direction corresponding to the insertion holes 27. The guide cone 9 is mounted on the rebound stopper 26 by inserting the locking claw 9a into the insertion hole 27 of the rebound stopper 26 from above and engaging it as shown in FIG.

  The mounting structure will be described in detail. In a state before assembly to the vehicle body panel 2, the rebound stopper 26 is pressed against the stopper rubber portion 44 by the urging force of the coil spring 8, and the stopper convex portion 48 is crushed. Full rebound state. At that time, as shown in FIG. 10, the displacement of the rebound stopper 26 in the downward direction X1 is limited by the general portion 42 of the stopper receiving portion 38, and the recessed portion 40 has a recess 50 in the base portion 46 of the stopper rubber portion 44 thereabove. Therefore, the gap 76 is ensured between the lower surface of the rebound stopper 26 even in the full rebound state. The locking claw 9a inserted into the insertion hole 27 of the rebound stopper 26 enters the clearance 76 and is locked. In order to sufficiently secure the gap 76, it is preferable that the upper surface 50 a of the concave portion 50 is located below the upper surface of the stopper receiving portion 38 in the general portion 42.

  In this way, with the guide cone 9 mounted on the rebound stopper 26, as shown in FIG. 9, it is inserted from below into the mounting hole 3 of the vehicle body panel 2, and the outer metal fitting 14 is inserted into the bolt 6 and nut 7. To fasten and fix to the vehicle body panel 2. After the guide cone 9 is mounted on the vehicle body panel 2, it is removed by releasing the engagement of the locking claw 9 a and removing it from the insertion hole 27.

  As described above, according to the present embodiment, the clearance 76 that is secured even in the full rebound state is provided on the upper surface of the stopper rubber portion 44, and the locking claw 9a of the guide cone 9 enters the clearance 76 to guide the guide cone. 9 is attached, it is possible to attach the guide cone 9 without separately providing an engagement metal fitting on the upper surface of the rebound stopper 26. Therefore, the guide cone 9 is attached without increasing the cost and weight. be able to.

  Further, at the time of rebound input while the vehicle is running, the stopper function can be secured by the general portion 42 of the stopper receiving portion 38, so that the characteristics of the rebound stopper are not impaired. In particular, in the present embodiment, the stopper rubber portion 44 is constituted by a base portion 46 and a stopper convex portion 48 projecting from the upper surface thereof, and the stopper convex portion 48 is further constituted by the first stopper convex portion 48a and the second stopper. Since the first stopper convex portion 48a is composed of two types of stopper convex portions 48a-1 and 48a-2 having different heights, the spring constant is gradually increased when there is a rebound input. It can be raised and is excellent in suppressing the generation of abnormal noise and the decrease in ride comfort.

It is a longitudinal cross-sectional view in the vehicle assembly state of the vibration isolator which concerns on one Embodiment of this invention. It is a top view of the vibration isolator (however, the 2nd and 3rd inner cylinder members are omitted). It is a bottom view of the vibration isolator (however, the second and third inner cylinder members are omitted). It is the IV-IV sectional view taken on the line of FIG. It is a top view of the outer metal fitting of the vibration isolator. It is a perspective view of the outer side metal fitting. It is the VII-VII sectional view taken on the line of FIG. It is the VIII-VIII sectional view taken on the line of FIG. It is a longitudinal cross-sectional view in the middle of assembling | attaching the vibration isolator to a vehicle body panel. It is a principal part expanded sectional view which shows the attachment structure of a guide cone and a vibration isolator.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Piston rod of shock absorber, 1a ... Upper end part 2 ... Body panel, 2a ... Lower surface 3 ... Mounting hole 8 ... Coil spring, 8a ... Upper end part 9 ... Guide cone, 9a ... Locking claw 10 ... Anti-vibration device 12 ... Inner tube metal fitting 14 ... Outer metal fitting 16 ... Anti-vibration base 26 ... Rebound stopper 38 ... Stopper receiving portion 40 ... Depressed portion 44 ... Stopper rubber portion 46 ... Base portion 46a ... Upper surface 48 ... Stopper convex portion, 48a ... First stopper convex portion 48b, second stopper convex portion 50, concave portion 76, gap X, vertical direction, X1, lower direction, X2, upper direction Y, radial direction, Y1, radial direction outward, Y2, radial direction inward C, circumferential direction.

Claims (4)

An inner cylinder fitting in which the upper end of the piston rod of the shock absorber is inserted and fixed from below;
An outer metal fitting that surrounds the outer periphery of the inner cylinder metal fitting, and is attached and fixed from the lower surface around the mounting hole of the vehicle body panel, and an outer metal fitting that receives the upper end of a coil spring that surrounds the shock absorber;
An anti-vibration base made of a rubber-like elastic body that is interposed between the inner cylinder fitting and the outer fitting and joins both fittings;
The inner cylinder fitting includes a rebound stopper that projects from the upper end of the inner cylinder fitting to the upper side of the outer fitting,
The outer metal fitting is provided with a stopper receiving portion for receiving the rebound stopper over the entire circumference of the outer metal fitting, and a stopper rubber portion for the rebound stopper is vulcanized over the entire upper surface of the stopper receiving portion,
The anti-vibration device, wherein the stopper receiving portion is provided with a depressed portion that is depressed downward at a plurality of locations in the circumferential direction, and a plurality of concave portions are provided in the circumferential direction corresponding to the depressed portion on the upper surface of the stopper rubber portion.   The stopper rubber portion includes an annular base provided on the entire upper surface of the stopper receiving portion, and a plurality of stopper convex portions protruding upward from the upper surface of the base and distributed in the circumferential direction of the base. The anti-vibration device according to claim 1, wherein the concave portion is provided at a plurality of locations in the circumferential direction so as to correspond to the depressed portion on the upper surface of the base portion.   A first stopper convex portion provided between the concave portions adjacent in the circumferential direction on the upper surface of the base portion, and a second stopper provided along the radially outer side of the concave portion. The vibration isolator according to claim 2, comprising a convex portion.   The vibration isolator according to claim 1, wherein the concave portions are provided at three equal intervals in the circumferential direction of the stopper rubber portion.

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