JPH07269631A - Mount structure for strut upper part - Google Patents

Abstract

PURPOSE:To restrain generation of hammering sound by a simple means without deteriorating any original function of an insulator. CONSTITUTION:An inner cylindrical fitting 10 is fixed on the upper part of a piston rod 6. An insulator 12 is interposed between the inner cylindrical fitting 10 and an outer cylindrical fitting 13 fixed on the vehicle body side. A ring-like ceiling part 14a of an upper fitting 14 is so arranged as to vertically face the upper surface of the insulator 12. A lower fitting 16 is so arranged as to vertically face the lower surface of the insulator 12. Stopper rubber parts 17, 19 are vertically provided together by being integrated with the insulator 12. Lip- like lip parts 18, 20 are continued on the whole periphery on the tip of respective stopper rubber parts 17, 19. The lip parts 18, 20 are elastic bodies extending upward, and whose diameter is increased, and they are energized into a state where they are pressed and deflected and their diameters is increased in the initial setting state.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mount structure for elastically supporting a strut upper part on a vehicle body in a strut type suspension, and more particularly to a mount structure for a strut upper part adopting an input separation type characterized by an insulator.

[0002]

2. Description of the Related Art As a conventional mount structure for the upper part of a strut, there is one disclosed in Japanese Utility Model Laid-Open No. 1-161101. As shown in FIG. 6, an inner cylindrical metal fitting 41 forming a rod-side metal fitting is coaxially fitted onto a small diameter portion of an upper portion of a piston rod 40 forming an upper portion of a strut, and a nut 42 is fitted to the small diameter portion. By being attached, the inner cylindrical metal fitting 41 is attached to the small diameter portion 40a at the upper part of the rod.
Are fixed coaxially.

An inner peripheral side of an insulator 43 formed in a substantially ring shape is vulcanized and bonded to the inner cylindrical metal member 41. The outer peripheral surface of the insulator 43 is vulcanized and adhered to the inner peripheral surface of the outer cylindrical metal fitting 44 which constitutes the vehicle body side metal fitting. Further, the outer cylindrical metal member 44 is fixed to the vehicle body side to form an upper mount portion. The upper metal fitting 45 and the lower metal fitting 46 are integrally formed with the outer cylindrical metal fitting 44.
Is provided. The upper fitting 45 is an outer cylindrical fitting 44.
Has a ring-shaped projecting portion 45a that horizontally projects in an inward flange shape in the rod direction (inward direction) from above, and the projecting portion 45a is vertically opposed to the upper surface of the insulator 43 with a predetermined gap. Has been done.

Similarly, the lower metal fitting 46 is the outer cylindrical metal fitting 4
4 from the bottom to the inward flange shape in the rod direction (inward)
Is horizontally overhanged and is vertically opposed to the lower surface of the insulator 43 at a predetermined interval. Also,
An upper stopper rubber portion 47 is integrally provided with the insulator 43 so as to project upward from the upper surface of the insulator 43, and a tip portion of the upper stopper rubber portion 47 is in contact with the lower surface of the upper fitting 45.

Further, a lower stopper rubber portion 48 is integrally provided with the insulator 43, and a lower stopper rubber portion 48 is provided so as to project downward from the lower surface of the insulator 43.
Of the lower metal fitting 46 is in contact with the upper surface of the lower metal fitting 46 described below. Then, the upper stopper rubber portion 47 and the lower stopper rubber portion 4
A stopper is composed of 8, the upper metal fitting 45, and the lower metal fitting 46.

In FIG. 6, 50 is a bump stopper and 5 is a bump stopper.
Reference numeral 1 is an upper spring seat for mounting the upper portion of the coil spring, and 52 is a thrust ball bearing.
In the mounting structure of the upper part of the strut, the load from the coil spring generated along with the vertical movement of the wheel is directly transmitted to the vehicle body side via the upper spring seat 31 and the lower metal fitting 46, and is received by the vehicle body side.

On the other hand, the load from the shock absorber due to the vertical movement of the wheel is subject to shear bending of the insulator 43 and compression bending of the upper stopper rubber portion or lower stopper rubber portion due to contact between the upper stopper rubber portion 47 and the upper metal fitting 45. When the lower stopper rubber portion 48 is abutted between the lower stopper rubber portion 48 and the lower stopper rubber portion 48, the lower stopper rubber portion 48 absorbs the compressive bending of the lower stopper rubber portion 48 to reduce the input to the vehicle body. The vertical displacement of the piston rod 40 is regulated within a predetermined range by the contact with the upper and lower fittings 45, 46.

[0008]

When a vertical load is applied to the shock absorber as the wheels bounce and rebound, the upper part of the piston rod 40 moves in the vertical direction while being elastically supported as described above. However, in the conventional mounting structure for the upper part of the strut as described above, the wheel is not bound or rebounded in the neutral state (the input from the piston rod 40 is zero).
Then, the tip end portions of the stopper rubber portions 47 and 48 are in contact with the upper and lower metal fittings 45 and 46, respectively, and one stopper is provided each time the vertical stroke of the wheel is large and the vertical displacement of the upper portion of the piston rod 40 is large. The rubber parts 47 and 48 are separated from the upper metal fitting 45 or the lower metal fitting 46 facing each other.

Therefore, the tip ends of the stopper rubber portions 47 and 48 and the upper and lower metal fittings 45 and 46 repeatedly collide with and separate from each other to generate a tapping sound. It should be noted that it is conceivable to increase the rigidity of the insulator 43 or to extend the height of the stopper rubber portion in order to suppress the generation of the hammering sound, but the upper and lower spring constants of the insulator 43 are increased and the insulator 4
3 The original sound vibration performance and riding comfort performance are deteriorated. From the viewpoint of sound vibration performance and riding comfort performance, the lower the upper and lower springs of the insulator 43 are, the more advantageous it is. It is easy to separate the metal fittings from. That is, tapping is likely to occur.

The present invention has been made in view of the above problems, and an object thereof is to suppress the generation of the tapping sound by a simple means without deteriorating the original function of the insulator.

[0011]

In order to achieve the above object, the mounting structure of the strut upper part according to claim 1 of the present invention is a rod side metal member fixed to the piston rod upper part of the strut and the vehicle body side. Is fixed to the vehicle body side metal fitting disposed on the outer periphery of the rod side metal fitting via an insulator, and the insulator further includes an upper stopper rubber portion and a lower stopper rubber portion protruding vertically. In addition, in the mount structure of the upper part of the strut, which is fixed to the vehicle body side and includes an upper metal fitting and a lower metal fitting which can respectively come into contact with the tip end portions of the stopper rubber parts in a vertically opposed manner, the upper stopper rubber part Of the lower stopper rubber portion and an upper protruding portion that extends upward from the distal end portion of the lower stopper rubber portion toward the upper fitting. A lower projection extending downward from the tip toward the lower fitting, each of the projections being made of an elastic member having low rigidity in the vertical direction of the vehicle body, and the upper fitting or the lower fitting facing each other in the initial state. It is characterized in that it is set in a state in which it is pressed in the vertical direction toward the insulator body side by the metal fitting and is bent by a predetermined amount or is compressed.

At this time, as described in claim 2, at least one of the upper projecting portion and the lower projecting portion has a flexural rigidity extending while expanding its diameter toward the opposing upper metal fitting side or lower metal fitting side. It is characterized in that it is made of a low elastic material and is bent to the insulator side by a predetermined amount by being pressed by the upper metal fitting or the lower metal fitting which face each other in the initial state.

Alternatively, as described in claim 3, at least one of the upper protruding portion and the lower protruding portion has a flexural rigidity that extends while being reduced in diameter toward the opposing upper metal fitting side or lower metal fitting side. It is made of a low elastic material, and is characterized in that, in the initial state, it is bent to the insulator side by a predetermined amount by being pressed by the upper metal fitting or the lower metal fitting which face each other.

Alternatively, as described in claim 4, at least one of the upper protruding portion and the lower protruding portion extends toward the opposing upper metal fitting side or lower metal fitting side and has a hollow portion. It is made of an elastic body whose rigidity in the vertical direction is set low, and in the initial state, it is compressed by a predetermined amount in the vertical direction by being pressed by the upper metal fitting or the lower metal fitting facing each other.

Further, as described in claim 5,
It is characterized in that the height of each of the stopper rubber portions is lowered so as not to come into contact with the opposing upper metal fitting side or lower metal fitting side in the initial state.

[0016]

As in the conventional case, the load acting in the vertical direction via the piston rod of the shock absorber is received by the shear bending of the insulator body, and the upper stopper rubber part and the upper stopper rubber part or the lower stopper rubber part and the lower metal part are contacted. The input to the vehicle body is reduced by being absorbed by the compression deflection of the upper stopper rubber portion or the lower stopper rubber portion due to the contact.

Further, the piston rod tries to move up and down in the axial direction, but the rigidity of the stopper rubber portion is increased by the above compression, and the vertical displacement of the piston rod is restricted within a predetermined range. Also, in the neutral state where the vehicle does not bounce or rebound in the standard posture, that is, in the initial state where the input from the piston rod to the insulator is zero, the tip of the upper stopper rubber part body is connected to the upper metal part through the upper protruding part. Abuts the underside of. In this state, the upper protruding portion is in a state of being pressed downward relative to the upper fitting and bent downward or in a compressed state.

Similarly, in the initial state in which the input from the piston rod to the insulator is zero, the tip portion of the lower stopper rubber portion main body is in contact with the upper surface of the lower metal member through the lower protruding portion. In this state, the lower projecting portion is in a state of being pressed upward relative to the lower fitting and bent upward or in a compressed state. At this time, the upper protrusion and the lower protrusion are in a bent state or in a compressed state, but the vertical rigidity is set to be low, so that the vertical movement of the upper portion of the piston rod is hardly restricted.

Then, for example, when the piston rod is displaced upward by a predetermined amount, the upper projecting portion further bends or compresses, and the upper stopper rubber portion receives a predetermined load from the upper metal fitting, so that the upper stopper rubber portion. A predetermined compression bending occurs in the main body, and the movement of the piston rod is regulated upward. On the other hand, with the upward movement of the piston rod, the lower stopper rubber portion is further separated from the upper surface of the lower metal fitting, but the lower member relatively moves downward in the protruding portion continuous with the lower stopper rubber portion. As a result, the pressing force from the lower member is reduced and restored downward by that amount, so that the protruding portion is maintained in contact with the upper surface of the lower fitting. That is, the lower stopper portion is kept in contact with the lower fitting via the protrusion.

From this state, when the piston rod moves downward, the protruding portion on the lower stopper rubber portion side is bent or compressed again due to the approach of the lower metal fitting, and subsequently,
When the piston rod moves downward by a predetermined amount or more, the lower protruding body further bends or compresses, and the lower stopper rubber portion receives a predetermined load from the lower metal fitting, so that the lower stopper rubber body is compressed and bent by a predetermined amount. Occurs, and the movement of the piston rod is restricted downward.

On the other hand, as the piston rod moves downward, the upper stopper rubber portion separates from the lower surface of the upper metal fitting, but in the protruding portion continuous with the upper stopper rubber portion, the upper member relatively moves upward. As a result, the pressing force from the upper member is reduced and the upper part is restored by that amount.
The protruding portion is kept in contact with the upper surface of the upper fitting. That is, the upper stopper is kept in contact with the upper fitting via the protrusion.

At this time, since the flexural rigidity of each protrusion is set to be low, it is easy to flex in the vertical direction, and even if the relative displacement of the upper and lower members in the vertical direction only follows the flexure, It has almost no effect of restricting the vertical displacement of the piston rod. Therefore, the load from the piston rod is received by the insulator body and the upper and lower stopper rubber portions, as in the conventional case.

Further, the lower metal fitting and the lower stopper rubber portion are always kept in contact with each other through the protrusion, and the protruding material seals between the lower metal fitting and the lower stopper rubber portion.
Therefore, water is prevented from entering the piston rod side between the lower metal fitting and the lower stopper rubber portion. As the protrusion, for example, as described in claim 2,
It is made of an elastic body having a low flexural rigidity and extending toward the upper metal fitting side or the lower metal fitting side facing the metal fitting while expanding the diameter.

In this case, since the protruding portion extends obliquely toward the upper metal fitting side or the lower metal fitting side facing each other in a lip shape, the upper metal fitting or the lower metal fitting whose surface faces one side of the protruding portion is formed. It is abutted and is initially set in a state of being bent toward the insulator by the facing upper metal fitting or lower metal fitting. From this state, when the upper metal fitting or the lower metal fitting facing each other moves in the separating direction, the projecting portion that has been bent following it is restored to the side of the upper metal fitting or the lower metal fitting that faces the upper metal fitting or the lower metal fitting. The contact with the side fittings is always maintained.

Further, as the projecting portion, for example, as described in claim 3, an elastic body having a low flexural rigidity extending toward the upper metal fitting side or the lower metal fitting side facing each other while reducing the diameter is formed. To do. In this case, since the protruding portion extends obliquely toward the upper metal fitting side or the lower metal fitting side facing each other in a lip shape, it is abutted on the upper metal fitting or the lower metal fitting whose surface faces one side of the protruding portion. , Is initially set in a state of being bent toward the insulator by the facing upper metal fitting or lower metal fitting.

From this state, when the upper metal fitting or the lower metal fitting facing each other moves in the separating direction, the projecting portion which is bent following it is restored to the upper metal fitting or the lower metal fitting side, and thereby the facing upper metal fitting. The contact with the metal fitting or the lower metal fitting is always maintained. Further, as the projecting portion, for example, as described in claim 4, the rigidity in the vertical direction is set to be low by extending toward the upper metal fitting side or the lower metal fitting side facing each other and providing a hollow portion. Composed of elastic body.

In this case, in the initial state, the projecting portion is compressed by a predetermined amount by being pressed by the upper metal fitting or the lower metal fitting facing each other so that the hollow portion expands in the lateral direction. When the upper metal fitting or the lower metal fitting that opposes moves away from this state, the hollow part that has been crushed following that will be restored by a predetermined amount, and the protruding portion that has been compressed will oppose the upper metal fitting or lower metal fitting. Extending toward the metal fitting, the contact with the opposite upper metal fitting or lower metal fitting is always maintained.

Further, by providing the protruding portion, it is not necessary to make the tip end portion of each stopper rubber portion have a height enough to contact with the upper metal fitting or the lower metal fitting facing each other, and the height of the stopper rubber can be conventionally reduced. It is possible to set the height to a lower value and to an appropriate height, and without lowering the original function of the insulator and stopper rubber part, the flexibility of setting the upper and lower spring constants is increased and the vertical movement of the upper part of the piston rod is improved. The degree of freedom in regulation amount is also improved.

[0029]

The above embodiment will be described with reference to the drawings. First, the structure will be described. As shown in FIG. 2, a wheel 1 is rotatably supported by a wheel support member 2 such as a knuckle. One end of a suspension arm 3 is swingably connected to the lower portion of the wheel support member 2 via a ball joint, and the suspension arm extends inward in the vehicle width direction. An inner end portion of the suspension arm is vertically swingably connected to a vehicle body side member such as a suspension member via a rubber bush.

A vertically extending strut 4 is fixed between the upper portion of the wheel supporting member 2 and the vehicle body side member. The strut 4 has a shock absorber having a cylinder tube 5 and a piston rod 6 and a coil spring 7. The cylinder tube 5 is
The lower end portion is rigidly connected to the upper portion of the wheel support member 2 and extends substantially upward. A piston rod 6 projects from the upper end surface of the cylinder tube 5 so as to be vertically strokeable.
A bump rubber 8 and a dust cover 9 are provided on the outer circumference of the piston rod 6, and a coil spring 7 is provided on the outer circumference thereof.
Are arranged.

The upper end portion of the piston rod 6 has a small diameter, and as shown in FIG. 1, the inner cylindrical metal member 10 constituting the rod side metal fitting is coaxially fitted to the small diameter portion, and the small diameter portion thereof is fitted. By attaching the nut 11 to
The inner cylindrical metal fitting 10 is fixed to the small diameter portion 6a above the rod 6. An insulator 12 made of a cylindrical rubber member is vulcanized and adhered to the inner cylindrical metal member 10 coaxially with the piston rod 6. The outer peripheral surface of the insulator 12 is vulcanized and adhered to the outer cylindrical metal fitting 13 that constitutes the metal fitting on the vehicle body side. The outer cylindrical metal fitting 13
The outer peripheral surface side of the is coaxially fixed to the inner peripheral surface of the upper metal fitting 14 having a cap shape.

The upper metal fitting 14 is arranged coaxially with the rod shaft so as to cover the rod upper portion 6a and the insulator 12 from above and laterally, but the central portion of the ceiling portion 14a thereof is opened and the rod tip portion is opened. Can project upward. The ring-shaped ceiling portion 14a of the upper metal fitting 14 is
It is arranged so as to face the upper surface of the insulator 12 in the vertical direction.

An outward flange 14b is provided on the outer periphery of the lower part of the upper fitting 14, and the outward flange 1b is provided.
4b is bolted to the vehicle body side 15 by a bolt (not shown). On the lower surface of the outward flange 14b, an outer peripheral portion of a disk-shaped lower metal fitting 16 having an opened central portion is coaxially fixed, and the piston rod 6 is loosely inserted into the central opening of the lower metal fitting 16. In addition, the upper surface of the lower metal fitting 16 is arranged so as to vertically oppose the lower surface of the insulator 12.

The upper metal fitting 14 is integrated with the insulator 12 from the upper surface of the insulator 12.
An upper stopper rubber portion 17 is provided so as to project toward the ceiling portion 14a of the. A lip-shaped lip portion 18 forming an upper protruding portion is continuous with the entire circumference of the tip portion of the upper stop rubber portion 17. As shown in FIG. 3, the lip portion 18 is an elastic body made of a rubber material or the like in which the flexural rigidity is set to be low by extending upward while expanding the diameter and setting the thickness thereof thin in an unloaded state. It is composed of.

In the initial setting state, the lip portion 18 is
It is pushed downward from the ceiling portion 14a of the upper fitting 14, and is urged from the state of FIG. 3 to the state of FIG. Further, a lower stopper rubber portion 19 is integrally provided with the insulator 12 so as to project from the lower surface of the insulator 12 toward the upper surface of the lower metal fitting 16.

A lip-shaped lip portion 20 forming a lower protruding portion is continuous with the entire circumference of the tip portion of the lower stop rubber portion 19. As shown in FIG. 3, in the unloaded state, the lip portion 20 extends downward while expanding the diameter and is made of a rubber material or the like whose flexural rigidity is set low by setting its thickness thin. It consists of a body. In the initial setting state, the lip portion 20 is pushed upward from the lower metal fitting 16 and urged from the state shown in FIG. 3 to the state shown in FIG. ing.

An upper seat bracket 22 is supported on the lower surface of the lower metal member 16 via a bearing 21 so as to be relatively rotatable and coaxial with each other. The upper part of the coil spring 7 is fixed to the lower surface side of the outer peripheral portion of the upper seat bracket 22, and the lower part of the coil spring 7 is
It is fixed to a lower seat bracket 23 fixed to the outer circumference of the cylinder tube 5.

In the mounting structure of the strut upper portion having the above-mentioned structure, for example, when the wheel 1 bounces, the coil spring 7 is compressed, and the coil spring 7 is thereby compressed.
Is transmitted to the vehicle body side through the upper seat bracket 22, the bearing 21, and the lower metal fitting 16, and the coil spring force is directly received by the vehicle body side. On the other hand, when the wheel 1 bounces, the shock absorber is also pushed upward, and the piston rod 6 tends to move axially upward.

At this time, the input from the piston rod 6 is received by the shear bending of the body of the insulator 12 and is absorbed by the compression bending of the upper stopper rubber portion 17 due to the contact between the upper stopper rubber portion 17 and the upper fitting 14. Input to the vehicle body is reduced. At the same time, the vertical displacement of the piston rod 6 is restricted to a predetermined range by the contact between the upper stopper rubber portion 17 and the ceiling portion 14a of the upper fitting 14.

At this time, the vehicle is in a neutral state in which it is not bound or rebound in the standard posture, that is, the piston rod 6
In the initial state in which the input from the insulator to the insulator 12 is zero, the tip portion of the upper stopper rubber portion 17 has the upper lip portion 1
It is in contact with the lower surface of the ceiling portion 14 a of the upper metal fitting 14 via 8. In this state, the upper lip portion 18 remains pressed while being pressed downward from the upper fitting 14 and bent downward.

Similarly, in the initial state in which the input from the piston rod 6 to the insulator 12 is zero, the tip of the lower stopper rubber portion 19 is in contact with the upper surface of the lower fitting 16 via the lower lip portion 20. In this state, the lower lip portion 20 is still urged by the lower metal fitting 16 so as to be relatively pressed upward and bent upward.

At this time, the upper lip portion 18 and the lower lip portion 20 are biased toward the insulator 12 side to exert a predetermined elastic force in the vertical direction, but the vertical rigidity is set low. By doing so, the vertical movement of the upper part of the piston rod 6 is hardly restricted. Then, for example, when the piston rod 6 is displaced upward by a predetermined amount as described above, the upper lip portion 18 is further bent, and the upper stopper rubber portion 17 receives a predetermined load from the upper metal member 14, so that the upper stopper portion 18 is deformed. Predetermined compression bending occurs in the rubber portion 17 to increase the rigidity, and the movement of the piston rod 6 upward is restricted.

On the other hand, with the upward movement of the piston rod 6, the lower stopper rubber portion 19 is further separated from the upper surface of the lower metal fitting 16. However, the lower stopper rubber part 1
The lower lip portion 20 continuing to 9 is the lower metal fitting 1 relatively.
When 6 moves downward, the pressing force from the lower metal fitting 16 is reduced and restored downward by that amount, so that the lip portion 20 is kept in contact with the upper surface of the lower metal fitting 16. That is, the lower stopper rubber portion 19 has the lip portion 20.
The state of being in contact with the lower metal fitting 16 via is maintained.

From this state, when the piston rod 6 moves downward, the lip portion 20 on the lower stopper rubber portion 19 side.
Is bent upward again by the pressure from the lower metal fitting 16, and when the piston rod 6 continues to move downward by a predetermined amount or more, the lower lip portion 20 is further bent and the lower stopper rubber portion 19 is moved from the lower metal fitting 16. Since a predetermined load is applied, a predetermined compression bending occurs in the lower stopper rubber portion 19 to increase the rigidity, and thus the downward movement of the piston rod 6 is restricted.

On the other hand, with the downward movement of the piston rod 6, the upper stopper rubber portion 17 separates from the lower surface of the upper metal fitting 14, but the lip portion 18 continuous with the upper stopper rubber portion 17 has a relative upper member. Is moved upward, the pressing force from the ceiling portion 14a of the upper metal fitting 14 is reduced and the upper portion is restored upward by that amount.
Is maintained in contact with the upper surface of the ceiling 14a of the upper fitting 14. That is, the upper stopper rubber portion 17 is the lip portion 1
The state of being in contact with the upper fitting 14 via 8 is maintained.

At this time, since the flexural rigidity of the lip portions 18 and 20 is set to be low, the lip portions are easily bent in the vertical direction, and the lip portions 18 and 20 are flexed in accordance with the relative displacement of the upper and lower metal fittings 14 and 16 in the vertical direction. Since it has no effect, it has almost no effect of restricting the vertical displacement of the piston rod 6. Therefore, the load from the piston rod 6 is received by the body of the insulator 12 and the upper and lower stopper rubber portions 17, 19 as in the conventional case.

Thus, even if the piston rod 6 is vertically displaced, the upper and lower stopper rubber portions 17 and 19 are connected to the upper fitting 14 on the vehicle body side through the lip portions 18 and 20, respectively.
Alternatively, even if the rod 6 is kept in contact with the lower metal fitting 16 and a large force is applied to the rod 6, the stopper rubber portions 17, 1
It is possible to prevent the tapping sound from being generated at the time of a collision between 9 and the upper metal fitting 14 or the lower metal fitting 16.

Further, since the mounting portions of the lower metal fitting 16 and the upper metal fitting 14 on the vehicle body side are open to the outside, there is a risk that water will enter the insulator 12 side from the mounting material. However, in this embodiment, even if the rod input is large, the gap between the lower metal fitting 16 and the lower stopper rubber portion 19 is always sealed by the lip portion 20, so that
The invading water is prevented from invading the rod side, which is advantageous for rust prevention of the piston rod.

At this time, between the inner cylindrical metal member 10 and the cylinder tube 5 of the piston rod 6, conventionally,
By providing the bump rubber 8 and the dust boot 9, it is possible to prevent sand, water, etc. from adhering to the piston rod 6. Further, the stopper rubber portions 17 and 19 are connected to the upper metal fitting 14 or the lower metal fitting 1 via the lip portions 18 and 20, respectively.
6, so that each stopper rubber portion 17, 19
Makes it possible to set the protrusion amount smaller than in the past. Therefore,
By setting the heights of the stopper rubber portions 17 and 19 low, the vertical spring constant of the insulator 12 can be set small.

As a result, for example, the vertical displacement of the piston rod 6 can be set larger than in the conventional case, and the sound vibration performance and the riding comfort performance can be improved. In the above-described embodiment, the protruding portions 18 and 20 are provided in a lip shape from the entire circumference of the tip end portion of each stopper rubber portion.
It is also possible to dispose intermittently without providing the entire circumference of the tip end portion of 7, 7. However, in this case, the above sealing performance is lost.

The shape of the protruding portion is not limited to the shape of the above-described embodiment, and is constituted by an elastic body which is reduced in diameter and extends upward like the upper protruding portion 30 shown in FIG. Good. In this case, in the initial state, the outer surface side of the upper projecting portion 30 is pressed downward by the ceiling portion 14a of the upper metal fitting 14 and is further urged in a state of being further reduced in diameter and bent downward. Further, the ceiling portion 14a of the upper metal fitting 14
Is relatively moved upward, the upper protrusion 30 is restored upward and maintains contact with the ceiling portion 14a.

Other functions and effects are the same as those in the above embodiment. At this time, in FIG. 4, the projecting portion 30 of another structural example is adopted as the upper projecting portion, but of course, it can also be adopted for the lower projecting portion. Further, the shape of the protruding portion is, for example, as shown in FIG.
As shown in FIG. 7, the hollow portion 31 may be formed in the central portion along the circumferential direction.

In this case, in the initial state, the protruding portion 30 is pressed in the vertical direction by the ceiling portion 14a of the upper metal fitting 14 or the lower metal fitting 16 and the hollow portion 31 is crushed up and down. The protruding portion 30 is compressed on the insulator 12 side. Further, when the upper and lower metal fittings 14 and 16 are relatively separated from each other, the upper projecting portion 30 is restored upward and maintains contact with the upper and lower metal fittings 14 and 16 facing each other.

Other functions and effects are similar to those of the above-mentioned embodiment.

[0055]

As described above, in the mounting structure of the upper portion of the strut of the present invention, even if the rod is largely displaced in the vertical direction, the stopper rubber portion has the upper metal member or the lower metal member facing each other through the protruding portion. Since the state of being in contact with the side metal fittings is ensured, it is possible to suppress the generation of hitting sound which has been conventionally generated at the upper portion of the strut even when traveling on a bad road or the like and the vertical stalk of the wheels becomes large.

At this time, by setting the rigidity of the protruding portion in the vertical direction to be low, the protruding portion does not resist the vertical displacement of the piston rod, and the spring constant of the insulator is set to a conventional setting value. be able to. In addition, the protrusion has a role of sealing the upper portion of the piston rod, which is advantageous in terms of rust prevention of the piston rod.

If the projecting portion is made of an elastic body having a low flexural rigidity that extends toward the upper metal fitting side or the lower metal fitting side facing each other while expanding the diameter, as described in claim 2, for example, Since the projecting portion is arranged so as to extend obliquely toward the upper metal fitting side or the lower metal fitting side, the one surface contacts the upper metal fitting side or the lower metal fitting side to face the facing surface. The contact is reliably maintained under the urged condition.

Similarly, as the projecting portion, an elastic body having a low flexural rigidity extending toward the upper metal fitting side or the lower metal fitting side facing each other while reducing the diameter, as described in claim 3, is adopted. , The protruding portion is arranged so as to extend toward the upper metal fitting side or the lower metal fitting side which diagonally faces, so that the upper metal fitting side or the lower metal fitting side facing on one side is contacted,
Contact is reliably maintained with the opposing surface being biased.

Further, as the projecting portion, for example, as described in claim 4, by extending toward the upper metal fitting side or the lower metal fitting side facing each other and providing a hollow portion, the rigidity in the vertical direction is set low. Even when the elastic body is used, the hollow portion is crushed in response to the pressure from the upper metal fitting or the lower metal fitting facing each other, so that the contact is reliably maintained. As described above, since each stopper rubber portion can be securely engaged with the upper metal fitting or the lower metal fitting via the protruding portion, the height thereof is set to be lower than that of the related art as described in claim 5. It becomes possible to do. As a result, the range of the spring constant in the vertical direction of the insulator is expanded, and in terms of sound and vibration performance,
It is advantageous in ride comfort performance.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a mount structure on an upper portion of a strut according to an embodiment of the present invention.

FIG. 2 is a diagram showing a strut of an example according to the present invention.

FIG. 3 is a diagram showing an unloaded state of a protrusion of an embodiment according to the present invention.

FIG. 4 is a cross-sectional view showing a mount structure of an upper part of a strut that adopts another configuration example of the protrusion of the embodiment according to the present invention.

FIG. 5 is a cross-sectional view showing a mount structure of an upper part of a strut that adopts another example of the structure of the protrusion of the embodiment according to the present invention.

FIG. 6 is a cross-sectional view showing a conventional mount structure on the upper part of a strut.

[Explanation of symbols]

 6 Piston rod 10 Inner cylindrical metal fitting 12 Insulator 13 Outer cylindrical metal fitting 14 Upper metal fitting 14a Ceiling part 15 Vehicle body side 16 Lower metal fitting 17 Upper stopper rubber part 18 Upper lip part (upper protruding part) 19 Lower stopper rubber part 20 Lower lip part ( Lower protrusion part 20 Upper protrusion part 30 Projection part 31 Hollow part

Claims (5)

[Claims] 1. A rod-side metal fitting fixed to an upper part of a piston rod of a strut and a vehicle-body-side metal fitting fixed to a vehicle body and arranged on an outer periphery of the rod-side metal fitting are connected via an insulator, and further, The insulator is provided with an upper stopper rubber portion and a lower stopper rubber portion which respectively project in the vertical direction, is fixed to the vehicle body side, and can abut on the tip portions of the stopper rubber portions so as to face each other in the vertical direction. In the mounting structure of the upper part of the strut including the upper side metal fitting and the lower side metal fitting, the upper protrusion protruding continuously from the tip of the upper stopper rubber part toward the upper metal part and the tip of the lower stopper rubber part. And a lower protrusion that extends downward from the tip toward the lower fitting in succession to the portion, and each of the protrusions is rigid in the vertical direction of the vehicle body. Is composed of a low elastic member, and is initially set to a state in which the upper metal fitting or the lower metal fitting facing each other is pressed in the vertical direction toward the insulator body side and bent or compressed by a predetermined amount. Mount structure on the upper part of the strut. 2. At least one of the upper protruding portion and the lower protruding portion is formed of an elastic body having a low flexural rigidity that extends while expanding its diameter toward the facing upper metal fitting side or lower metal fitting side.
The mount structure of the strut upper portion according to claim 1, wherein, in an initial state, the upper strut and the lower clasp facing each other are bent toward the insulator side by a predetermined amount by being pressed by the facing upper and lower fittings. 3. At least one of the upper projecting portion or the lower projecting portion is formed of an elastic body having a low flexural rigidity that extends while being reduced in diameter toward an upper metal fitting side or a lower metal fitting side facing each other,
The mount structure of the strut upper portion according to claim 1, wherein, in an initial state, the upper strut and the lower clasp facing each other are bent toward the insulator side by a predetermined amount by being pressed by the facing upper and lower fittings. 4. An elastic body in which at least one of the upper protruding portion and the lower protruding portion extends toward the upper metal fitting side or the lower metal fitting side facing each other and is provided with a hollow portion so that rigidity in the vertical direction is set low. The mount structure for the upper part of the strut according to claim 1, wherein, in an initial state, the upper strut or the lower strut is opposed to each other and is compressed by a predetermined amount in the vertical direction. 5. The height of each stopper rubber part main body is lowered so that the height of each stopper rubber part main body does not come into contact with the facing upper metal fitting side or lower metal fitting side in the initial state. The mount structure of the strut upper part according to any one of claims 1 to 4.