JP2010048378A - Strut mount - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a strut mount which allows elimination of cutting work and caulking work for fixing a rebound stopper metal fitting while reducing the total number of required metal fittings including an inner metal fitting and a rebound stopper metal fitting. <P>SOLUTION: In the strut mount 14, the rebound stopper metal fitting 22 is formed in a cup shape having a cylindrical inner fitting part 64, a bottom 66 and a rebound stopper part 68 projecting radially outward the upper end side. The inner fitting part 64 is press-fitted and fixed to the cylindrical top 44 of an inner metal fitting 18. A bearing 79 is arranged on the lower side of the bottom 66 to fasten and fix the bottom 66 and bearing 79 to each other with a piston rod 12. The lower part 46 has a rubber coated layer 58 on its inner surface. The outer peripheral part of the bearing 79 abuts on the lower part 46 with the rubber coated layer 58 elastically compressed under an assembled state. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a strut mount that elastically connects a piston rod of a shock absorber in a suspension and a vehicle body, and that vibrates between them.

  Conventionally, the piston rod of a shock absorber, which is an element of a suspension in a vehicle, and the vehicle body are elastically connected by a strut mount to prevent or suppress the transmission of vibration from the shock absorber to the vehicle body side due to the vibration isolation action of the strut mount. Has been done.

  Conventionally, various types and forms of such strut mounts are known. One of them is (a) an outer metal fitting, and (b) a cylindrical upper part and an upper part, which are formed downward. An inner metal fitting that has a shape that expands radially outward and has a lower portion that acts as a stopper when bouncing, (c) a rubber elastic body that connects the outer metal fitting and the inner metal fitting, and (d) an inner metal fitting A rebound stopper bracket that is fixed and moves up and down together with the inner bracket, and acts as a stopper when rebounding.The outer bracket side is fixed to the vehicle body, and the inner bracket side is fixed to the piston rod of the shock absorber. A strut mount is known that has an anti-vibration effect by elastic deformation of a rubber elastic body with a shock absorber.

FIG. 5 shows a specific example thereof.
In the figure, 200 is a strut mount, 202 is an outer metal fitting, 204 is an inner metal fitting, 206 is a rubber elastic body integrally vulcanized and bonded to the outer metal fitting 202 and the inner metal fitting 204, and 208 is an inner metal fitting. It is a rebound stopper metal fitting that is fixed to the metal fitting 204 and moves up and down together with the inner metal fitting 204 to perform a stopper action when rebounding.
The rebound stopper fitting 208 is separate from the inner fitting 204 and is fixed and held on the inner fitting 204.

The outer metal fitting 202 has a plate-like attachment portion 210 projecting radially outward, and the attachment portion 210 is attached and fixed to the vehicle body panel 214 by attachment bolts 212.
The inner metal member 204 has a cylindrical upper portion 216 that has a cylindrical shape, and a skirt-shaped lower portion 218 that extends from the lower portion thereof and expands outward in the radial direction.
Here, the lower portion 218 acts as a stopper when bounding. That is, the lower part 218 functions as a bound stopper part.

  Here, the inner metal fitting 204 is composed of two metal fittings, an outer first metal fitting 204-1 and an inner second metal fitting 204-2, and the upper portion of the outer first metal fitting 204-1 is the inner first metal fitting 204-1. The two metal fittings 204-2 are welded in an externally fitted state, and the first metal fitting 204-1 and the second metal fitting 204-2 are joined.

The inner second metal fitting 204-2 has a function of fixing and holding the bearing 220, and a lower end portion thereof is caulked to the bearing 220 to fix the bearing 220. In the figure, 222 represents the caulking portion.
In addition, the point which fixes the bearing 220 to the inner metal fitting 204 by crimping the lower end part of the inner second metal fitting 204-2 is disclosed in the following Patent Document 1.

The upper part of the second metal fitting 204-2 forms a holding part 224 of the rebound stopper metal fitting 208.
The rebound stopper fitting 208 has an outer peripheral portion as a rebound stopper portion 226 and an inner peripheral portion as a fixing portion 228. The fixing portion 228 is an inner fitting 204, specifically, a holding portion 224 of the second fitting 204-2. It is fixed by caulking.
In the figure, reference numeral 230 denotes a caulking portion of the second metal piece 204-2.
In addition, it is disclosed by patent document 1 about fixing the rebound stopper metal fitting 208 comprised separately with respect to the inner metal fitting 204 in this way to the 2nd metal fitting 204-2 of the inner metal fitting 204 by caulking.

In the strut mount 200 of FIG. 5, the inner metal fitting 204 is composed of the first outer metal fitting 204-1 and the second inner metal fitting 204-2. The inner metal fitting 204 has a function as a bound stopper, This is because a function of fixing and holding the bearing 220 and a function of fixing and holding the rebound stopper fitting 208 configured separately are required.
In this case, since it is necessary to fix the first metal fitting 204-1 and the second metal fitting 204-2, in the strut mount 200 shown in FIG. 5, they are joined by welding.

  However, in this case, in addition to the need for two metal fittings of the outer first metal piece 204-1 and the inner second metal piece 204-2 as the inner metal piece 204, welding for joining them is performed. This complicates the manufacturing process of the strut mount 200, which increases the cost of the strut mount 200.

  Further, in the case of this strut mount 200, the rebound stopper bracket 208 is separate from the inner bracket 204, and the total number of brackets including the inner bracket 204 is as large as three, and the rebound stopper bracket 208 is used as the inner bracket. In order to fix to 204, very much effort and cost will be required.

  In order to fix the rebound stopper fitting 208 to the inner fitting 204 by caulking as described above, the upper part of the second fitting 204-2 of the inner fitting 204 is cylindrical as shown in the partially enlarged view of FIG. It is necessary to form the stepped portion 232 there by cutting the outer peripheral surface of the upper end portion.

  The rebound stopper bracket 208 is fixed in this manner by first cutting the inner bracket 204 (specifically, the second bracket 204-2) to form a thin portion 230a therein, and the rebound stopper bracket with respect to the thin portion 230a. 208 is fitted to the stepped portion 232 in a fitted state, and then the thin portion 230a is bent radially outward and crimped to the fixing portion 228 of the rebound stopper fitting 208, and this is fitted to the second fitting 204-2. The holding portion 224 is fixed.

Many processes must be performed during this time, and in particular, the cutting process for forming the thin-walled part 230a and the stepped part 232 requires a lot of time and labor, and the cost for the cutting process is high. It will be very expensive.
These greatly increase the manufacturing cost of the strut mount 200 of FIG.

In addition, there exist some which were disclosed by following patent document 2, patent document 3, patent document 4, patent document 5, and patent document 6 with respect to this invention.
Of these, Patent Documents 2 and 3 disclose that the rebound stopper metal fitting is press-fitted and fixed to the inner metal fitting, but those disclosed in Patent Document 2 and Patent Document 3 are disclosed. Is different from the present invention in other configurations.

  On the other hand, Patent Document 4, Patent Document 5, and Patent Document 6 disclose that a rubber coating layer is provided on the inner surface of the lower part of the inner metal fitting, but the purpose of this rubber coating layer is different from the present invention. Further, those disclosed in these patent documents are different from the present invention in other configurations.

Japanese Patent No. 3800888 JP 2007-91130 A Japanese Patent No. 3987544 JP 2004-232824 A JP 2007-107714 A JP 2008-128273 A

  The present invention is based on the circumstances as described above, and the number of necessary metal fittings including the inner metal fittings and the rebound stopper metal fittings can be reduced, and cutting and caulking that require a high cost for fixing the rebound stopper metal fittings. It is an object of the present invention to provide a strut mount that can omit processing and can also omit a welding process for forming an inner metal fitting, and can reduce the manufacturing cost as a whole.

  Thus, according to the first aspect of the present invention, (a) an outer metal fitting, (b) a cylindrical upper part and a continuous upper part are formed, extending downward in the radial direction and being bounded. (C) a rubber elastic body connecting the outer metal fitting and the inner metal fitting, and (d) moving up and down together with the inner metal fitting and rebounding. A rebound stopper metal fitting that sometimes acts as a stopper, the outer metal fitting side being fixed to the vehicle body, the inner metal fitting side being fixed to the piston rod of the shock absorber, and between the vehicle body and the shock absorber. In a strut mount that acts as an anti-vibration function by elastic deformation of a rubber elastic body, the rebound stopper metal fitting is a rebounce that protrudes radially outward from a cylindrical inner fitting portion, a bottom portion, and an upper end side. A cup shape having a stopper portion is formed, and the inner fitting portion is press-fitted and fixed to the cylindrical upper portion of the inner metal fitting from the bottom side, and is interposed between the inner metal fitting and the piston rod. A bearing is disposed on the lower side of the bottom portion so that the outer peripheral portion faces upward with respect to the lower portion of the inner metal fitting and the central portion overlaps with the bottom portion. A rubber coating layer is provided on the inner surface of the lower portion, and the rubber coating layer is elastically compressed when the outer peripheral portion of the bearing is assembled. It is made to contact | abut to the said lower part upwards via.

  According to a second aspect of the present invention, in the first aspect, the bottom surface of the bottom portion is a flat surface, and a lower surface of the inner metal fitting forms a stepped surface with respect to the lower surface and extends radially outward. An extending flat surface is formed, and the outer peripheral portion of the bearing is in contact with the lower flat surface through the rubber coating layer in a state of elastically compressing the rubber coating layer. To do.

  According to a third aspect of the present invention, in the lower portion of the inner metal fitting according to the second aspect, a downward falling surface is formed at the lower portion of the lower portion following the flat surface of the lower portion, and the flat surface of the lower surface of the bottom portion is formed. An accommodation recess for accommodating at least a part of the bearing is formed on the flat surface and the falling surface of the lower portion.

  According to a fourth aspect of the present invention, in any one of the first to third aspects, a flat metal fitting is interposed between the bottom and the lower part of the inner metal fitting and the bearing, and the rubber coating layer is interposed via the flat metal fitting. The bearing and the bottom are fastened and fixed by the piston rod in a state in which they are elastically compressed.

  According to a fifth aspect of the present invention, in any one of the first to fourth aspects, the cylindrical upper portion and the lower portion of the inner metal fitting are formed by a single same metal fitting.

Effects and effects of the invention

  As described above, according to the present invention, the rebound stopper fitting is formed into a cup shape having a rebound stopper portion on the upper end side, and the cylindrical inner fitting portion of the rebound stopper fitting is directed downward from the bottom side to the cylindrical portion of the inner fitting. The bearing that is interposed between the inner metal fitting and the piston rod is press-fitted into and fixed to the bottom of the inner metal fitting, and the center portion is opposed to the bottom of the rebound stopper metal fitting. The bottom part and the center part of the bearing are fastened and fixed with a piston rod, and a rubber coating layer is provided on the inner surface at the lower part of the inner metal fitting. In the assembled state, the rubber coating layer is elastically compressed and brought into contact with the lower portion upward.

  In the present invention, since the rebound stopper metal fitting is fixed to the inner metal fitting by press-fitting, it is possible to omit the cutting process and the caulking process for the inner metal fitting as described above for fixing the rebound stopper metal fitting. Thus, the required cost for manufacturing the strut mount can be greatly reduced.

  If the rebound stopper bracket is simply press-fitted and fixed downward with respect to the inner bracket, when the large load is applied to the rebound stopper bracket from the shock absorber piston rod, the rebound stopper bracket will be There is a risk of falling out.

Here, in the present invention, a bearing having a larger diameter than the bottom is superposed on the lower side of the bottom of the rebound stopper fitting configured in a cup shape, and the bottom and the bearing are fastened up and down by a piston rod. Thus, even if a large load is input upward from the piston rod to the rebound stopper bracket, the rebound stopper bracket is prevented from coming out upward from the inner bracket due to the contact of the bearing against the lower portion of the inner bracket. Can be prevented.
That is, the present invention is characterized in that such a bearing is effectively used as a member for preventing the rebound stopper fitting from coming off.

  In addition, in the present invention, the rebound stopper metal fitting has a function of holding the bearing via the piston rod at the bottom thereof, that is, the rebound stopper metal fitting itself has a bearing holding function. Unlike the conventional strut mount shown, it is not necessary to give the inner metal fitting itself a bearing holding function, and the required functions of the inner metal fitting can be reduced.

Therefore, according to the present invention, it is possible to omit the metal fitting for caulking and holding the rebound stopper metal fitting in the inner metal fitting, and the metal fitting for holding the bearing. Subsequently, it is possible to form the lower part of the shape extending downward in the radial direction downward with the same metal fitting according to claim 5, and the number of required metal fittings for the inner metal fitting configuration can be reduced. Specifically, the inner metal fitting can be configured with a single metal fitting.
Therefore, the welding process for joining a plurality of metal fittings constituting the inner metal fitting can be omitted, and the problem that the machining process is complicated due to the welding is solved, and the cost for the construction of the inner metal fitting is reduced. It becomes possible.

In the present invention, a rubber coating layer is provided on the inner surface of the lower portion of the inner metal fitting, and the outer peripheral portion of the bearing is applied to the lower portion through the rubber coating layer in a state where the rubber coating layer is elastically compressed in the assembled state. There is no.
By doing in this way, the outer peripheral part of a bearing can be reliably made to contact | adhere to the lower part of an inner metal fitting via a rubber coating layer.
Thereby, a bearing can be hold | maintained favorably with the stable attitude | position, and a bearing can fully exhibit the function.

  According to a second aspect of the present invention, the bottom surface of the bottom portion is formed as a flat surface, and a flat surface extending upward in the radial direction is formed at a lower portion of the inner metal fitting so as to form a stepped surface with respect to the flat surface of the bottom surface of the bottom portion. Then, the outer peripheral portion of the bearing is brought into contact with the lower flat surface through the rubber coating layer in a state where the rubber coating layer is elastically compressed.

  The lower surface of the bottom of the rebound stopper bracket is a flat surface, and a flat surface is formed on the lower portion of the inner bracket that is flush with the flat surface of the bottom. It is technically difficult to achieve this in practice because it is inevitable that manufacturing errors and assembling errors of each metal fitting are in contact with each other in the assembled state.

If this is done in the design, the lower flat surface of the inner bracket protrudes downward from the flat surface of the bottom bottom surface of the rebound stopper bracket due to the above-mentioned errors in manufacturing the bracket and errors or variations in assembly. Can occur.
If it becomes such a state, a bearing will be attached in the state which floated downward from the flat surface of the bottom part of a rebound stopper metal fitting.
In this case, if the bearing and its bottom are fastened up and down with a piston rod, the bearing may be damaged.

  Therefore, in claim 2, the lower flat surface of the inner metal fitting is surely positioned at a position where it is held upward with a step with respect to the flat surface of the bottom lower surface of the rebound stopper metal fitting, and the difference in position, that is, the bottom portion The level difference between the flat surface of the lower surface and the lower flat surface of the inner metal fitting is absorbed by elastically compressing the rubber coating layer provided on the inner surface of the lower portion, and the center of the bearing is securely attached to the bottom lower surface of the rebound stopper metal fitting. In addition to being in close contact with the flat surface, the outer peripheral portion of the bearing is brought into close contact with the lower flat surface of the inner metal fitting through the rubber coating layer. Regardless of the manufacturing variation of the inner bracket and the inner bracket, the entire bearing is securely attached to the bottom of the rebound stopper bracket and the inner It is possible to be pressed against the lower part of the ingredients.

In this case, at the lower part of the inner metal fitting, a downward falling surface is formed following the flat surface of the lower part, and the flat surface of the bottom lower surface and the flat surface and the falling surface of the lower part are used to form the bearing. An accommodation recess for accommodating at least a part can be formed (claim 3).
By doing so, the bearing can be stably held in the assembled state.

  In the present invention, a flat metal fitting is interposed between the bottom and the lower part of the inner metal fitting and the bearing, and the rubber covering layer is elastically compressed by the flat metal fitting through the flat metal fitting. Can be fastened and fixed by a piston rod (claim 4).

For example, when a resin bearing is used as the bearing, the rigidity is lower than that of a metal bearing, and the bearing may be bent by fastening with a piston rod.
In such a case, the function of the bearing may be impaired or the bearing may be damaged, and in some cases, the rebound stopper fitting may come off from the inner fitting with breakage of the bearing.
However, according to the fourth aspect, such inconvenience can be avoided by the reinforcing effect of the flat metal fitting.

Next, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 shows the strut mount of this embodiment in an assembled state to a vehicle (however, the vehicle body side is not shown).
In the figure, reference numerals 10 and 12 are metal coil springs constituting the elements of the suspension, and piston rods protruding upward from the cylinder of the shock absorber.

Reference numeral 14 denotes a strut mount that is interposed between the piston rod 12 and the vehicle body and acts to prevent vibrations.
Here, the strut mount 14 functions to elastically connect the piston rod 12 and the vehicle body via a rubber elastic body 20, which will be described later, and transmits a load from the vehicle body to the coil spring 10 via the rubber elastic body 20. Is supported by the coil spring 10.

  In this embodiment, the strut mount 14 includes an outer metal fitting 16, an inner metal fitting 18, a rubber elastic body 20 that is integrally vulcanized and bonded to the outer metal fitting 16 and the inner metal fitting 18, and the inner metal fitting 18. It has a rebound stopper fitting 22 configured separately.

The outer metal fitting 16 includes a cylindrical portion 24 having a substantially tapered shape, and a flange portion 26 that has an annular shape in the circumferential direction and protrudes radially outward from a lower end portion thereof.
The outer peripheral end portion of the flange portion 26 is bent in a curved shape downward in the figure over the entire circumference, and the upper end portion of the cylindrical portion 24 is bent in a curved shape radially inward over the entire circumference. .
In the figure, 28 represents a curved bent portion of the flange portion 26, and 30 represents a stopper contact portion on the rebound side formed of a curved bent portion at the upper end portion of the cylindrical portion 24.

  Further, the outer metal fitting 16 has a portion extending from the lower end portion of the cylindrical portion 24 to the flange portion 26 and has a substantially U-shaped cross section so as to protrude downward over the entire circumference. A stopper contact portion 32 with respect to the bounce stopper portion 52 is formed.

As shown in FIG. 2A, the flange portion 26 is further protruded radially outward at three locations in the circumferential direction, and the protruding portion forms a plate-like attachment portion 34. Yes.
A through-hole fixing hole 38 for the mounting bolt 36 is formed in the mounting portion 34, and the mounting bolt 36 is fixed in an inserted state there.
Here, the mounting bolt 36 is provided with a serration portion 42 on the large-diameter head 40 side, and the serration portion 42 is fixed to the fixing hole 38 so as to bite into the inner surface of the fixing hole 38.

The inner metal fitting 18 has a cylindrical upper portion 44 having a cylindrical shape, and a lower portion 46 that is formed following the lower end portion of the upper portion 44 and extends radially downward in the figure in a skirt shape. is doing.
The lower portion 46 is bent from the lower end of the upper portion 44 and protrudes outward in the radial direction. The contact portion 48 contacts the bearing 79 described later upward, and obliquely downward from the outer peripheral end of the contact portion 48. A falling portion 50 having a tapered shape and a bound stopper portion 52 that protrudes further outward in the radial direction from the lower end of the falling portion 50 in the figure are formed.
Here, each of the contact portion 48, the falling portion 50, and the bound stopper portion 52 has an annular shape that is continuous in the circumferential direction.

The rubber elastic body 20 includes a rubber main body 54 that is sandwiched between the outer metal fitting 16 and the inner metal fitting 18 and has an annular shape and a substantially reverse taper shape.
The strut mount 14 acts to prevent vibration between the piston rod 12, that is, the shock absorber and the vehicle body, based on the elastic deformation of the rubber main body 54.
The load of the vehicle body is transmitted to the coil spring 10 via the strut mount 14 with the compression elastic deformation of the rubber main body portion 54, and the load of the vehicle body is supported by the coil spring 10.

  The rubber elastic body 20 is also formed continuously with the rubber main body portion 54 and wraps around the rubber cover layer 56 that covers the outer peripheral surface of the cylindrical portion 24 of the outer metal fitting 16 and the bound stopper portion 52 of the inner metal fitting 18. A rubber coating layer 58 that covers the inner surface of the lower portion 50 is integrally provided.

Here, the rubber coating layer 56 extends around the upper end portion of the cylindrical portion 24 of the outer metal fitting 16 and is continuous with the rubber main body portion 54, and is positioned above the stopper contact portion 30 at the upper end of the cylindrical portion 24. The part forms a rubber stopper 60 on the rebound side.
On the other hand, in the rubber coating layer 58, the portion located on the upper side of the bound stopper portion 52 forms the bound rubber stopper portion 62.
The rubber coating layer 58 that has wrapped around the inner surface of the inner metal fitting 18 covers the lower surface of the abutting portion 48 in the lower portion 46, and the tip of the rubber coating layer 58 reaches the position closest to the inner surface of the cylindrical upper portion 44 in the inner metal fitting 18.
These rubber coating layers 56 and 58 are continuously formed over the entire circumference.

The rebound stopper fitting 22 includes a cup-shaped inner fitting portion 64 that has a cylindrical shape, a bottom portion 66, and a rebound stopper portion 68 that protrudes radially inward from the upper end of the inner fitting portion 64 in a flange shape. I have.
Here, the rebound stopper portion 68 has an annular shape that is continuous in the circumferential direction.

  As shown in FIG. 3, the rebound stopper fitting 22 is separate from the inner fitting 18, and the inner fitting portion 64 extends downward from the bottom 66 side to the cylindrical upper portion 44 of the inner fitting 18. By being press-fitted, the inner metal fitting 18 is fixed and assembled.

The rebound stopper portion 68 of the rebound stopper fitting 22 has a root-side portion forming an arc-shaped curved portion 70, and the curved portion 70 is continuous with the internal fitting portion 64.
The rebound stopper fitting 22 is press-fitted downward in the drawing to the inner fitting 18 until the base 70 is in contact with the upper end of the upper portion 44 of the inner fitting 18, and the amount of press-fitting is defined by the contact. The

The lower surface of the bottom portion 66 of the rebound stopper fitting 22 is a bearing 79 described later, specifically, a flat surface 72 in a direction perpendicular to the axis that abuts the central portion thereof upward in the drawing.
On the other hand, the lower surface of the abutting portion 48 in the lower portion 46 of the inner metal member 18 is also a flat surface 74 in the direction perpendicular to the axis that abuts the bearing 79, specifically, the outer peripheral portion thereof upward.

However, as shown in FIG. 2B, the flat surface 72 on the bottom 66 side is flat on the lower surface of the abutting portion 48 in the lower portion 46 of the inner metal fitting 18 with the rebound stopper metal fitting 22 being press-fitted into the inner metal fitting 18. It protrudes slightly downward in the figure from the surface 74, and a step d is formed between them.
This level difference d is as small as about 0.2 mm, for example.

  2B, the flat surface 72 on the bottom surface of the bottom portion 66 of the rebound stopper fitting 22, the flat surface 74 on the bottom surface of the contact portion 48 of the lower portion 46 of the inner fitting 18, and the falling surface 76 on the inner surface of the falling portion 50 are shown. As a whole, an accommodation recess 78 for accommodating an upper portion of a bearing 79 described later is formed.

As shown in FIG. 1, a bearing (here, a thrust bearing) 79 is interposed between the inner metal fitting 18 and the piston rod 12.
Here, the entire bearing 79 has a larger diameter than the inner fitting portion 64 of the rebound stopper fitting 22.
The bearing 79 includes an upper case (upper raceway) 80, a lower case (lower raceway) 82, and a ball 84 sandwiched therebetween, and the lower case 82 is attached to a metal spring seat 86. It is made to contact | abut to downward.
Here, the spring seat 86 is a spring receiver and has a shallow inverted dish shape, and the coil spring 10 is received in a state in which the upper end of the coil spring 10 is brought into contact with the lower surface thereof.

  On the other hand, the upper case 80 is disposed on the lower side of the bottom 66 so that the central portion thereof directly overlaps with the bottom 66 of the rebound stopper fitting 22, that is, directly contacts the flat surface 72 on the bottom surface of the bottom 66. 66 and the piston rod 12 are fastened together.

Specifically, the upper case 80 and the bottom 66 have insertion holes 88 and 90 having the same diameter formed in the center of the upper case 80 and the bottom 66 in concentric positions, and the small diameter of the piston rod 12 is provided there. A shaft portion 92 is inserted upward.
A male screw 94 is formed on the tip end side of the shaft portion 92, and a nut 96 is screwed into the male screw 94, and the upper case 80 and the bottom portion 66 are overlapped by the nut 96 and the stepped portion 98 of the piston rod 12. It is fastened up and down.

At this time, the outer peripheral portion of the upper case 80 is in contact with the flat surface 74 on the lower surface of the lower portion 46 side that forms a step with respect to the flat surface 72 on the lower surface of the bottom 66 via the rubber coating layer 58. It becomes a state.
Specifically, the bottom surface of the contact portion 48 is interposed through the rubber coating layer 58 in a state where the portion located below the contact portion 48 of the rubber coating layer 58 formed thicker than the step d is elastically compressed upward. It will be in the state contact | abutted to the flat surface 74 of this.

That is, the upper case 80 extends across the bottom 66 of the rebound stopper fitting 22 and the abutting portion 48 of the lower portion 46 of the inner fitting 18 in the radial direction, and the upper surface thereof extends to the bottom 66 and the abutting portion 48, respectively. It will be in the state contact | abutted with respect.
As shown in FIG. 1, the bearing 79 including the upper case 80 is also elastically compressed in the radial direction at the portion located inside the falling portion 50 of the rubber coating layer 58 in the assembled state.

  In this embodiment, the rotation of the piston rod 12 is transmitted to the inner metal member 18 via the bearing 79 and the rebound stopper metal member 22, and at this time, the rubber elastic body 20 is elastically deformed in the torsional direction to absorb the rotation.

  In this embodiment, when the inner fitting 18 is about to be displaced largely downward relative to the outer fitting 16 together with the piston rod 12, the rebound stopper portion 68 in the rebound stopper fitting 22 is replaced with the cylindrical portion 24 in the outer fitting 16. An excessive displacement at that time is regulated by contacting the stopper contact portion 30 at the upper end portion of the upper end portion of the upper end portion via the rubber stopper portion 60 and acting as a stopper.

  On the other hand, when the inner metal fitting 18 is about to be displaced largely upward in the drawing together with the piston rod 12 with respect to the outer metal fitting 16, the bound stopper portion 52 of the inner metal fitting 18 is a rubber stopper against the stopper contact portion 32 of the outer metal fitting 16. Excessive displacement on the bounce side is regulated by the contact through the portion 62, that is, the stopper action at that time.

  When a large load is applied upward from the piston rod 12 to the rebound stopper fitting 22 fixed by press fitting at the time of bouncing, the bearing 79 is in contact with the contact portion 48 of the inner fitting 18. The rebound stopper fitting 22 is prevented from coming off upward.

  As described above, in the present embodiment, since the rebound stopper fitting 22 is fixed to the inner fitting 18 by press-fitting, the cutting of the inner fitting 18 and the caulking process for fixing the rebound stopper fitting 22 are omitted. This can greatly reduce the cost required for manufacturing the strut mount.

  However, when the rebound stopper bracket 22 is simply press-fitted and fixed downward with respect to the inner bracket 18, when a large upward load is input from the piston rod 12 of the shock absorber to the rebound stopper bracket 22, the rebound stopper bracket There is a possibility that 22 will come off from the inner metal fitting 18.

  Here, in this embodiment, a bearing 79 having a diameter larger than that of the bottom portion 66 is superposed on the lower side of the bottom portion 66 of the rebound stopper fitting 22 configured in a cup shape, and the bottom portion 66 and the bearing 79 are connected to the piston rod. 12, even if a large load is applied upward from the piston rod 12 to the rebound stopper bracket 22, the rebound stopper bracket 22 is brought into contact with the lower portion 46 of the inner bracket 18 by the bearing 79. Can be prevented from coming out of the inner metal fitting 18 upward.

  In addition, in the present embodiment, the rebound stopper fitting 22 has a function of holding the bearing 79 via the piston rod 12 at the bottom 66, that is, the rebound stopper fitting 22 itself has a holding function of the bearing 79. Therefore, unlike the conventional strut mount shown in FIG. 5, it is not necessary to give the inner bracket itself a bearing holding function, and the required functions of the inner bracket can be reduced.

Therefore, according to the present embodiment, it is possible to omit the metal fitting for caulking and fixing the rebound stopper metal fitting 22 and holding the bearing 79 in the inner metal fitting 18, the cylindrical upper portion 44 of the inner metal fitting 18, Subsequently, the lower portion 46 having a shape extending outward in the radial direction toward the lower side can be configured by the same metal fitting.
As a result, it is possible to reduce the number of required metal fittings for the inner metal fitting configuration, specifically, to configure the inner metal fitting 18 with a single metal fitting.
Therefore, it is not necessary to configure the inner metal fitting 18 by welding a plurality of metal fittings, eliminating the problem that the machining process is complicated due to the welding, and reducing the cost for configuring the inner metal fitting 18. it can.

In the present embodiment, a rubber coating layer 58 is also provided on the inner surface of the lower portion 46 of the inner metal fitting 18, and the outer peripheral portion of the bearing 79 is placed through the rubber coating layer 58 so as to elastically compress the rubber coating layer 58 in the assembled state. The abutting portion 48 of the lower portion 46 is brought into contact with the outer peripheral portion of the bearing 79 so that the outer peripheral portion of the bearing 79 is reliably brought into contact with the abutting portion 48 of the inner metal fitting 18 through the rubber coating layer 58. I can leave it to you.
As a result, the bearing 79 can be satisfactorily held in a stable posture, and the function of the bearing 79 can be stably and fully exhibited.

  In this embodiment, the bottom surface of the bottom portion 66 is formed as a flat surface 72, and a flat surface 74 that forms a stepped surface with respect to the flat surface 72 of the bottom surface of the bottom portion 66 is formed on the lower portion 46 of the inner metal member 18. The outer peripheral portion of the rubber coating layer 58 is brought into contact with the flat surface 74 through the rubber coating layer 58 in a state where the rubber coating layer 58 is elastically compressed.

The bottom surface of the bottom portion 66 of the rebound stopper fitting 22 is a flat surface 72, and the bottom surface of the contact portion 48 of the inner fitting 18 is a flat surface 74 that is flush with the flat surface 72 of the bottom portion 66. It is technically difficult to realize this because it is inevitable that manufacturing errors and assembly errors of each bracket are unavoidably caused when the corresponding upper surfaces are simultaneously brought into contact with each other in the assembled state. Then, in some cases, the flat surface 74 on the lower surface of the contact portion 48 in the inner metal fitting may protrude downward from the flat surface 72 on the lower surface of the bottom 66 of the rebound stopper metal fitting 22.
If it will be in such a state, the bearing 78 will be attached to the state which floated downward from the flat surface 72 of the bottom part 66 bottom face of the rebound stopper metal fitting 22.

Therefore, in the present embodiment, the flat surface 74 is surely positioned at a position where the flat surface 74 is refrained upward with a step from the flat surface 72, and the difference in position, that is, the step d is provided on the inner surface of the lower portion 46. The coating layer 58 is absorbed by being elastically compressed, and the center portion of the bearing 79 is securely brought into close contact with the flat surface 72 on the bottom surface of the bottom 66 of the rebound stopper fitting 22, and the outer peripheral portion of the bearing 79 is interposed via the rubber coating layer 58. The flat surface 74 is in close contact with the flat surface 74.
Therefore, according to this embodiment, the entire bearing 79 is securely attached to the bottom 66 of the rebound stopper fitting 22 and the inner fitting regardless of the manufacturing variation of the rebound stopper fitting 22 and the inner fitting 18 and the variation during assembly. 18 can be pressed against the abutting portion 48 of the lower portion 46.

  In the present embodiment, the housing recess 78 is formed and the upper portion of the bearing 79 is housed therein, so that the bearing 79 can be held in a stable assembled state.

FIG. 4 shows another embodiment of the present invention.
In this example, a flat metal fitting 100 is interposed between the rebound stopper metal fitting 22 and the upper case 80 of the bearing 79, and the bearing 79 is connected to the bottom 66 of the rebound stopper metal fitting 22 and the inner metal fitting via the flat metal fitting 100. This is an example in which the abutting portion 48 is brought into contact with the abutting portion 48 in the lower portion 46 of FIG.

When a resin bearing is used as the bearing 79, the resin bearing 79 has lower rigidity and strength than the metal bearing 79, so that it directly contacts the bottom 66 and the contact portion 48. Then, the bearing 79 may be bent or damaged, and the rebound stopper fitting 22 may come off from the inner fitting 18 when the bearing 79 is broken.
However, according to this embodiment, such inconvenience can be avoided by the reinforcing effect of the flat metal fitting 100.

Although the embodiment of the present invention has been described in detail above, this is merely an example.
For example, as a desirable example, in FIGS. 1 and 4, which is an embodiment of the present invention, not only the contact portion 48 of the inner metal member 18 but also the rubber coating layer 58 inside the falling portion 50 is not only the outer periphery of the bearing 79. However, it is not essential that the rubber coating layer 58 inside the falling portion 50 is elastically compressed in the radial direction, and there is no gap between the outer peripheral surface of the bearing 79 and the peripheral surface. There may be.
In addition, this invention can be comprised in the form which added the various change in the range which does not deviate from the meaning.

It is sectional drawing which shows the strut mount of one Embodiment of this invention in an assembly state. (A) It is a perspective view of the strut mount of the embodiment. (B) It is sectional drawing of the strut mount of the embodiment. It is the figure which showed the strut mount of the same embodiment in the state before rebound stopper metal fitting press-fit. It is a figure of the strut mount of other embodiments of the present invention. It is a figure of a conventionally well-known strut mount.

Explanation of symbols

DESCRIPTION OF SYMBOLS 12 Piston rod 14 Strut mount 16 Outer metal fitting 18 Inner metal fitting 20 Rubber elastic body 22 Rebound stopper metal fitting 44 Upper part 46 Lower part 56,58 Rubber coating layer 64 Inner fitting part 66 Bottom part 68 Rebound stopper part 72, 74 Flat surface 76 Falling surface 78 Housing recess 79 Bearing 100 Flat metal fitting

Claims (5)

(a) an outer metal fitting, (b) an inner part having a cylindrical upper part and a lower part that is formed following the upper part and that extends downward in the radial direction and that serves as a stopper when bounding Metal fittings, (c) a rubber elastic body that connects the outer metal fittings and the inner metal fittings, and (d) a rebound stopper metal fitting that is fixed to the inner metal fittings and moves up and down together with the inner metal fittings to act as a stopper when rebounding, The outer metal fitting side is fixed to the vehicle body, the inner metal fitting side is fixed to the piston rod of the shock absorber, and the rubber elastic body elastically deforms between the vehicle body and the shock absorber. In the strut mount to
The rebound stopper metal fitting is formed into a cup shape having a cylindrical inner fitting portion, a bottom portion, and a rebound stopper portion protruding radially outward at the upper end side, and the inner fitting portion is formed into the cylindrical upper portion of the inner metal fitting. And press-fit into the bottom side,
The bottom portion of the bearing interposed between the inner metal fitting and the piston rod is arranged so that the outer peripheral portion faces upward with respect to the lower portion of the inner metal fitting and the center portion overlaps with the bottom portion. The bottom part and the center part of the bearing are fastened and fixed by the piston rod, and a rubber coating layer is provided on the inner surface of the lower part so that the outer peripheral part of the bearing is assembled. A strut mount, wherein the rubber coating layer is configured to abut on the lower portion through the rubber coating layer in an elastically compressed state.   2. The lower surface of the bottom portion according to claim 1, wherein a flat surface that forms a stepped surface with respect to the lower surface and extends radially outward is formed at a lower portion of the inner metal fitting. The strut mount is characterized in that the outer peripheral portion of the bearing abuts against the flat surface of the lower portion through the rubber coating layer in a state of elastically compressing the rubber coating layer.   The lower surface of the inner metal fitting according to claim 2, wherein a lower falling surface is formed following the flat surface of the lower portion, and the flat surface of the lower surface of the bottom portion and the flat surface of the lower portion A strut mount characterized in that an accommodating recess for accommodating at least a part of the bearing is formed on the falling surface.   In any one of Claims 1-3, a flat metal fitting is interposed between the bottom and the lower part of the inner metal fitting and the bearing, and the rubber covering layer is elastically compressed through the flat metal fitting. A strut mount, wherein the bearing and the bottom are fastened and fixed by the piston rod.   The strut mount according to any one of claims 1 to 4, wherein a cylindrical upper part and a lower part of the inner metal part are formed by a single same metal part.

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