JP5622467B2 - Anti-vibration bush and method for manufacturing anti-vibration bush assembly - Google Patents

Description

  The present invention relates to a press-fit type anti-vibration bush with both end flanges and a method of manufacturing an anti-vibration bush assembly that can be suitably applied to an anti-vibration bush used for a connection portion between a vehicle suspension and a vehicle body.

This type of press-fit type anti-vibration bush with both end flanges has been widely used for anti-vibration connection of a pair of members.
A typical example of the application is a vibration-isolating bush used for a connecting portion between a suspension of a vehicle and a vehicle body.
For example, in Patent Document 1 below, an anti-vibration bush having an inner cylinder fitting and a cylindrical rubber elastic body vulcanized and bonded to the outer peripheral surface of the inner cylinder fitting is used for anti-vibration connection between the suspension of the automobile and the vehicle body side. Examples have been disclosed.

FIG. 10 shows a specific example in which an anti-vibration bush is applied for anti-vibration connection between a vehicle suspension and a vehicle body side.
In FIG. 10, 200 is a tire, 202 is a front suspension arm, and the right portion in the figure branches into a front branch arm 204 and a rear branch arm 205, and each tip has a cylindrical shape. Press-fit cylinder portions 206 and 208 are configured.
Then, a vibration-proof bushing 212 is press-fitted vertically into the press-fitting cylinder portion 208 and assembled.
Further, the vibration-proof bushing 210 is press-fitted horizontally in the front-rear direction and assembled to the front press-fitting cylinder portion 206.
The direction indicated by arrow A in FIG. 10 is the front side of the vehicle.

  As shown in FIG. 11A, the anti-vibration bush 210 has an inner cylindrical metal fitting 214 and a cylindrical rubber elastic body 216 vulcanized and bonded to the outer peripheral surface thereof. The outer peripheral surface of 216 is press-fitted into the press-fitting cylinder portion 206 of the suspension arm 202 and is held.

  Reference numeral 218 denotes a bracket on the vehicle body, which has a U-shaped holding portion 224 having a pair of holding portions 220 and a connecting portion 222 for connecting them, and the inner cylinder fitting 214 of the vibration isolating bushing 210 is the holding portion. 220 is fixed to the vehicle body side bracket 218 by bolts 226 and nuts 228 so as to be sandwiched in the axial direction.

The rubber elastic body 216 includes a first flange portion 230 and a second flange portion 232 at one axial end projecting annularly outward in the radial direction, and a cylindrical rubber main body portion 234 therebetween. Yes.
Moreover, the rubber main body 234 has a shape in which the axial intermediate portion bulges radially outward over the entire circumference in a free-form state before press-fitting as shown in FIG. A portion between the bulging portion 236 and the first flange portion 230 and the second flange portion 232 forms a thin portion 238 over the entire circumference, and an annular recess 240 is formed on the outer peripheral side of the thin portion 238. ing.

The rubber main body portion 234 is compressed and elastically deformed so that a part of the bulging portion 236 escapes into the concave portion 240 at the time of press-fitting, and a large amount of friction is generated between the rubber main-body portion 234 and the inner surface of the press-fitting cylindrical portion 206 based on the restoring force by the elastic deformation. Give power.
Thus, in the press-fitted state, the first flange portion 230 and the second flange portion 232 are in a state of being positioned on the outer side in the axial direction of the press-fit cylinder portion 206.

The first flange portion 230 and the second flange portion 232 have the following functions in addition to preventing foreign matters such as dust from entering between the press-fitting cylinder portion 206 and the rubber elastic body 216. .
That is, when the suspension arm 202 is relatively displaced downward in FIG. 10 with respect to the vehicle body side bracket 218 at the time of braking, the first flange portion 230 is located on the lower side of the vehicle body side bracket 218 in FIG. It abuts against the clamping portion 220 to act as a stopper and restricts the suspension arm 202 from being largely displaced in the same direction.

On the other hand, when the suspension arm 202 is relatively displaced upward in FIG. 10 by a certain amount when the vehicle starts, the second flange 232 abuts against the upper clamping portion 220 of the vehicle body side bracket 218 in FIG. 11A. This acts as a stopper and restricts the suspension arm 202 from being relatively displaced upward in the figure.
The first flange portion 230 and the second flange portion 232 abut against the clamping portion 220 at an earlier stage as the axial thickness is increased, and act as a stopper.

FIG. 12 schematically shows a press-fitting method when the anti-vibration bush 210 is press-fitted into the press-fitting cylinder portion 206 of the suspension arm 202.
Reference numeral 244 denotes a pressing jig. Here, the vibration isolating bush 210 is set in the pressing jig 244, and the pressing jig 244 is pressed downward in the drawing by the press-fitting device 242, and the vibration isolating bush 210 is pressed into the press-fitting cylinder portion 206. Press fit against.

As can be seen from FIG. 12, in the case of the anti-vibration bush 210, the press-fitting direction of the suspension arm 202 with respect to the press-fitting cylinder portion 206 is limited to one direction.
That is, press-fitting of the vibration-isolating bushing 210 into the press-fit cylinder part 206 can be press-fitted only from the upper side in the figure, that is, from the front side to the rear side of the suspension arm 202, and in the opposite direction, ie, the lower side in the figure. It is impossible to press-fit from the side toward the upper side.

As is clear from FIG. 12, a sufficient space necessary for press-fitting the vibration-proof bushing 210 toward the press-fit cylinder portion 206 is obtained on the lower side of the press-fit cylinder portion 206 in the drawing, that is, the rear side in the vehicle front-rear direction. Because there is no.
Therefore, the vibration-proof bushing 210 can be press-fitted into the press-fitting cylinder 206 only in one direction with the first flange 230 as the forward end.

FIG. 13 specifically shows the details of the action during the press-fitting.
As shown in FIG. 13A, in the case of an anti-vibration bushing where the thickness of the second flange portion 232 is thin (the conventional one is thin), the pushing jig 244 When the first collar 230 is pressed downward in the drawing into the press-fit cylinder 206 by the set press-fitting stroke necessary for protruding the first collar 230 from the press-fit cylinder 206 in the axial direction, the second collar 232 faces upward in the figure at this time. By elastically warping and deforming, only the main rubber part 234 is press-fitted into the mating press-fitting cylinder part 206. That is, the second flange portion 232 does not enter the press-fit cylinder portion 206 and remains outside the press-fit cylinder portion 206 in the axial direction.

After that, this time, the inner cylindrical fitting 214 of the vibration-proof bushing 210 is returned upward from the lower side in the drawing upward by a minute set return stroke upward in the direction opposite to the press-fitting direction, and the elastically warped deformed second collar portion While returning the shape of the H.232, the anti-vibration bushing 210 is finally positioned at an appropriate assembly position in the axial direction with respect to the press-fit cylinder portion 206 by this return.
In this state, the first flange portion 230 and the second flange portion 232 are in a state of being in close elastic contact with the respective end surfaces in the axial direction of the press-fit cylinder portion 206.
Here, since the return operation has a minute return stroke of about several millimeters, the return operation is performed by, for example, pushing up the plate-like return tool 250 upward in FIG. 12 as shown in FIG. Can be done.
In FIG. 13, reference numeral 246 denotes a guide jig that serves as a guide for press-fitting, and has an inner surface that gradually decreases in diameter toward the press-fitting hole of the press-fitting cylinder portion 206.

  However, when the vehicle starts, in order to enhance the stopper function of the second flange portion 232, the thickness of the second flange portion 232 is increased as a whole. Then, the second flange portion 232 enters the inside of the press-fit cylinder portion 206 without remaining outside the press-fit cylinder portion 206 when pressed and pressed.

  This is because the thickness of the second flange portion 232 is increased overall, so that the resistance to elastic warp deformation of the second flange portion 232 is increased when the vibration isolating bushing 210 is pressed into the press-fit cylinder portion 206. As shown in FIG. 13B, the second flange 232 is elastically deformed in the reduced diameter direction without causing elastic warp deformation, and as a result, the second flange 232 does not remain outside the press-fit cylinder portion 206. In addition, it is a phenomenon caused by entering the inside of the press-fitting cylinder portion 206 together with the rubber main body portion 234.

  When press-fitting and assembling the vibration-proof bushing 210 to the press-fitting cylinder 206, after press-fitting for a set press-fitting stroke, this time press-fitting is performed for a minute return stroke in the direction opposite to the press-fitting direction. The second flange portion 232 that has entered the inside of the portion 206 is not pushed out of the press-fit cylinder portion 206 by the return operation, and remains in the state of having entered the inside of the press-fit cylinder portion 206.

In this case, a large return stroke may be considered, but this is actually difficult.
For one thing, there arises a problem that the assembly position in the axial direction of the anti-vibration bushing 210 with respect to the press-fit cylinder portion 206 is shifted from an appropriate position.
In addition, the first flange portion 230 which is the forward end in the press-fitting direction is excessively excessive when returning after the press-fitting operation when the wall thickness is increased over the entire circumferential direction in order to enhance the stopper function during braking. When the press-fitting return is performed by a stroke, the first flange portion 230 is likely to enter the inside of the press-fitting cylindrical portion 206 due to the compression elastic deformation in the diameter reducing direction at the time of the return.

This point can also occur in the same manner when a portion of the first flange portion 230 in the circumferential direction is thickened in the axial direction.
For example, during braking of the vehicle, the stopper function by the first flange 230 is enhanced (stop action is made from an early stage), while the suspension arm 202 centered on the front vibration-proof bushing 210 shown in FIG. In order to make the torsion spring characteristic in the P direction of the anti-vibration bushing 210 when the load in the torsional direction applied to the anti-vibration bushing 210 by rotation in the opposite direction) softer than the torsional spring characteristic in the vertical direction (perpendicular to the paper surface), Part of the first bushing 230 in the circumferential direction of the vibration isolating bushing 210, specifically, the upper part in the vertical direction of the vehicle is partially thicker in the axial direction than the other part, In such a case, when the anti-vibration bush 210 is returned after the press-fitting operation with an excessive stroke due to the presence of the thick portion in the axial direction, There is a possibility that the 1 flange portion 230 may enter the interior of the press-fit tube portion 206 is compressed elastically deformed in diameter direction without warping in a direction opposite to the returning direction.
The input of the load in the above-described twisting direction occurs when the vehicle suddenly starts and stops.

  Incidentally, as a prior art related to the present invention, the following patent document 2 discloses an invention relating to an anti-vibration bush. There are provided rubber protrusions for positioning from the pair of inner cylinder fittings to the outer side in the radial direction on the vibration isolating bush, while a corresponding pair of positioning holes are provided in the support holes of the support jig at the time of press-fitting. Is provided, and the rubber protrusions and the positioning holes are fitted to each other so that the circumferential positioning of the anti-vibration bush with respect to the press-fitting cylinder portion is made.

JP 2003-343625 A JP 2006-90409 A

  In the present invention, against the background described above, the pair of flanges at both ends in the axial direction are satisfactorily positioned on both outer sides in the axial direction of the press-fit cylinder part when the mating member is press-fitted into the press-fit cylinder part. The object of the present invention is to provide a vibration-proof bush that can be manufactured and a method for manufacturing an assembly of the vibration-proof bush and a mating member.

Thus, claim 1 relates to a vibration-proof bushing, and includes an inner cylinder fitting and a cylindrical rubber elastic body vulcanized and bonded to the outer peripheral surface of the inner cylinder fitting, Has a first flange part at one end in the axial direction and a second flange part at the other end in the axial direction, and a cylindrical rubber body part between the first and second flange parts. And the rubber main body portion is press-fitted in the axial direction with respect to a press-fit cylinder portion which does not have a flange portion projecting radially outward of the mating member at both axial end portions. Sandwiched between the metal fitting and the press-fit cylinder part, the first collar part and the second collar part are press-fit and assembled to the mating member in a state of being positioned on the outer side in the axial direction of the press-fit cylinder part, An anti-vibration bush with both end flanges in a form in which the press-fitting direction at the time of press-fitting is limited to one direction in which the first flange is the forward end of the press-fitting, and the second At least a portion of the circumferential direction of the parts is, and a shape that protrudes radially outward from the first flange portion, projecting radially outward from the first flange portion of the second flange portion The portion is characterized in that the portion is located radially inward from the outer peripheral end of the press-fitting cylinder portion of the mating member in the press-fitting assembled state .

  According to a second aspect of the present invention, in the first aspect, the second flange portion has a shape protruding outward in the radial direction from the first flange portion over the entire circumference.

  According to a third aspect of the present invention, in the first aspect of the present invention, only a part of the second collar portion in the circumferential direction protrudes radially outward from the first collar portion.

According to a fourth aspect of the present invention, in any one of the first to third aspects, the first brim part has a shape in which a part of the circumferential direction protrudes in the axial direction with respect to the other part, The axial thickness is thicker than the other portions.

Claim 5 relates to a method of manufacturing a vibration-proof bushing assembly, and includes an inner cylinder fitting and a cylindrical rubber elastic body vulcanized and bonded to the outer peripheral surface of the inner cylinder fitting, and the rubber elastic body. Each of the first collar part at one end in the axial direction and the second collar part at the other end in the axial direction projecting annularly outward in the radial direction, and a cylindrical shape between the first collar part and the second collar part. A rubber main body portion, which is press-fitted in the axial direction with respect to the press-fitting cylinder portion of the mating member, the rubber main body portion being sandwiched between the inner cylinder fitting and the press-fitting cylinder portion, And the second flange part are press-fit and assembled to the mating member in a state of being positioned on the outer side in the axial direction of the press-fitting cylinder part. An anti-vibration bush with both end flanges in a form limited to one direction as an end, wherein at least a part of the second flange portion in the circumferential direction is the first flange When manufacturing the vibration isolating bushing assembly by assembling the vibration isolating bushing with the flanges on both ends, which are shaped to protrude outward in the radial direction to the mating member, toward the press-fitting hole of the press-fitting cylinder portion A guide jig for inserting (press-fitting) and guiding the first flange part toward the press-fitting hole is set while the inner surface is gradually reduced in diameter, and the vibration isolating bush is connected to the inner cylinder fitting on the second flange part side. And holding the vibration-proof bushing in the direction opposite to the press-fitting direction of the second hook part from the first hook part side to the press-fitting cylinder part. Along with the elastic warp deformation, the first flange part is pushed in by a set press-fitting stroke to a position protruding from the press-fitting cylinder part, and then the anti-vibration bushing is deformed by the elastic warp from the side of the first flange part. The direction opposite to the press-fitting direction while restoring the shape of the 2 collar Back stroke back set, and performs assembly to the press-fit tube portion of the vibration isolating bushing.

According to a sixth aspect of the present invention, in the fifth aspect , the vibration-proof bushing has a shape in which a part of the circumferential direction of the first flange portion protrudes in the axial direction with respect to the other part, The second flange portion is provided with a positioning convex portion for positioning in the circumferential direction with respect to the press-fitting cylinder portion on an end surface on the outer side in the axial direction. The pushing jig is provided with a magnet that attracts the axial end surface of the inner metal fitting with a magnetic force and a positioning recess that fits into the positioning projection, and the positioning projection is the The inner cylindrical metal fitting can be adsorbed by the magnet when fitted in the positioning recess.

According to a seventh aspect of the present invention, in the sixth aspect , the positioning convex portion is provided in a shape extending radially outward from a position separated in a radial direction from the inner cylindrical fitting, and the positioning convex portion and the positioning convex portion It is characterized in that a space is formed between the inner cylinder fitting.

Effects and effects of the invention

  As described above, according to the first aspect of the present invention, in the vibration-proof bushing assembled by being press-fitted in the axial direction from the first flange part side to the press-fitting cylinder part of the mating member, the first anti-vibration bush opposite to the first flange part is assembled. At least a part of the circumferential direction of the second collar part is formed in a shape projecting radially outward from the first collar part.

According to this first aspect, when the vibration isolating bush is pushed into the press-fitting cylinder portion of the mating member from the side of the first flange portion, a part of the second flange portion in the circumferential direction is more than the first flange portion. By setting it as the shape which protruded to radial direction outward, the compression elastic deformation of the diameter reduction direction of a 2nd collar part can be suppressed.
Therefore, even when the thickness of the second collar portion is increased, it is possible to elastically deform the second collar portion in the direction opposite to the press-fitting direction at the time of press-fitting, so that the second collar portion is press-fitted. It can be left outside in the axial direction of the tube portion.
As a result, it is possible to satisfactorily press-fit the vibration-proof bushing into the press-fit cylinder portion.

Further, in the first aspect, the portion of the second flange portion that protrudes radially outward from the first flange portion is positioned radially inward from the outer peripheral end of the press-fitting cylinder portion of the mating member in the press-fit assembly state. As described above, a projecting dimension outward in the radial direction is set.

If the portion of the second flange portion that protrudes radially outward from the first flange portion protrudes radially outward from the outer peripheral end of the press-fit cylinder portion, the protruding portion is the outer peripheral end of the press-fit cylinder portion. However, according to the present invention, such a situation can be prevented.

In this case, the second collar part can be formed in a shape projecting radially outward from the first collar part over the entire circumference (Claim 2).
If it does in this way, at the time of press-fitting of the vibration-proof bushing to the press-fit cylinder part, it is possible to more effectively prevent the second collar part from entering the mating cylinder part due to the compression elastic deformation in the diameter reducing direction.

On the other hand, in the present invention, only a part of the second collar portion in the circumferential direction can be formed in a shape projecting radially outward from the first collar portion (Claim 3).
Even in this case, the radially projecting shape of a part of the circumferential direction effectively prevents the second flange part from entering the entire inside of the press-fitting cylinder part by the compression elastic deformation in the reduced diameter direction, The second collar portion can be elastically deformed in the direction of warping deformation, and the second collar portion can be left outside in the axial direction of the press-fit cylinder portion during press-fitting.

  According to the third aspect, the material for forming the second collar portion can be saved as compared with the case where the first collar portion is protruded radially outward from the first collar portion over the entire circumference according to the second aspect. In addition, there is an advantage that the weight can be reduced.

The present invention has a shape in which a part of the circumferential direction of the first flange portion protrudes in the axial direction with respect to the other part, and the thickness of the part of the axial direction is thicker than the other part. This is effective when applied to the bush (claim 4 ).

Thus, when the 1st collar part has the partial thick part which makes thickness in an axial direction, if the return amount is enlarged at the time of return after press-fit operation, the 1st collar part will be a press-fit cylinder part. It becomes easy to enter inside.
Therefore, by increasing the return amount after the press-fitting operation, it is difficult to push the second flange part that has entered the press-fitting cylinder part back outward from the press-fitting cylinder part.

  However, in the present invention, it is possible to effectively prevent the second collar part from entering the press-fit cylinder part at the time of press-fitting, so that the second collar part is outside the press-fit cylinder part while making the press-fit return stroke minute and appropriate. The anti-vibration bush can be assembled in the state of being positioned at the position.

Then claim 5, a method of manufacturing a vibration damping bushing assembly body formed by assembling pressed the vibration isolating bushing of claim 1 to press-fit tube portion of the mating member, vibration damping bush assembly according to the claim 5 By manufacturing the appendage, it is possible to effectively prevent the second flange portion, which is the end on the rear side in the press-fitting direction, from entering the press-fitting cylinder portion at the time of press-fitting, and the vibration-proof bushing to the press-fitting cylinder portion. On the other hand, the assembled state can be good and appropriate.

A sixth aspect of the present invention provides a vibration-isolating bushing according to the fourth aspect , more specifically, a shape in which a part in the circumferential direction of the first flange portion protrudes in the axial direction with respect to the other part, and a part thereof is in the axial direction relative to the other part The manufacturing method of claim 5 is applied to the manufacturing method of the vibration-proof bushing assembly when the thickness of the part is a thick thick part. In the manufacturing method of claim 6 , the second method A magnet that adsorbs the axial end surface of the inner tube metal fitting to the pressing jig by magnetic force, while a positioning convex portion for positioning in the circumferential direction with respect to the press-fitted tube portion is provided on the axially outer end surface of the flange portion. And a positioning concave portion that fits into the positioning convex portion, and when the positioning convex portion is fitted into the positioning concave portion, the inner cylindrical metal fitting can be adsorbed by a magnet.

According to the manufacturing method of the sixth aspect, the spring characteristic in the direction perpendicular to the axis, for example, in the vehicle vertical direction and the horizontal direction, is determined by the positioning convex portion provided in the second flange portion and the positioning concave portion provided in the pushing jig. In addition to the fact that the anti-vibration bush having anisotropy in shape can be press-fit and assembled in a state where the relative position in the circumferential direction is properly aligned with the press-fit cylinder portion, the following advantages can be obtained.

  That is, if the vibration isolating bushing is not properly positioned in the circumferential direction with respect to the press-fitting cylinder, the inner cylinder fitting of the vibration isolating bush cannot be adsorbed by the pushing jig, and accordingly the circumferential position of the vibration isolating bushing Can be reliably prevented from being assembled to the press-fit cylinder part at a wrong circumferential position without being correctly aligned with the press-fit cylinder part.

In the manufacturing method according to claim 6, the positioning convex portion is provided in a shape extending radially outward from a position farther in the radial direction than the inner cylindrical fitting, and the positioning convex portion and the inner cylindrical fitting are provided. A space can be formed between the two (claim 7 ).

  If the positioning convex portion is provided in such a form, when the anti-vibration bush is press-fitted into the press-fitting cylinder portion, the positioning convex portion provided on the axial end surface of the second collar portion is the second collar portion. It is possible to effectively prevent the warp deformation from being hindered.

It is the perspective view which showed the anti-vibration bush of one Embodiment of this invention in the free-form state. FIG. 2 is a plan view, a side view, and a cross-sectional side view of the vibration isolating bush of FIG. 1. FIG. 3 is a cross-sectional view of FIG. It is the figure which showed the anti-vibration bush of the embodiment in the vehicle assembly | attachment state. It is displacement explanatory drawing of the twist direction of the vibration isolating bush of the embodiment. It is a figure of the pushing jig | tool of a vibration proof bush. It is explanatory drawing of the principal part process of the manufacturing method of the vibration-proof bushing assembly of the embodiment. It is explanatory drawing of the principal part process following FIG. It is a figure of the vibration proof bush of other embodiment of this invention. It is the figure which showed the specific example which used the vibration proof bush for the vibration proof connection of the suspension of a motor vehicle and the vehicle body side. It is the figure which showed the principal part of FIG. It is the figure which showed typically the press-fit assembly method of the vibration proof bush. It is the figure which showed the detail of the press-fit assembly method of FIG.

Next, embodiments of the present invention will be described in detail with reference to the drawings.
In FIG. 4, reference numeral 202 denotes a suspension arm, and 218 denotes a bracket on the vehicle body side.
The suspension arm 202 and the vehicle body side bracket 218 are the same as those shown in FIGS. 10 and 11, and the suspension arm 202 is integrally configured with a press-fitting cylinder portion 206 having a cylindrical shape at an end portion thereof.

  Further, the vehicle body side bracket 218 has a U-shaped holding portion 224 having a pair of sandwiching portions 220 and a connecting portion 222 for connecting them, and an inner cylinder fitting to be described later in the vibration isolating bushing 10 of the present embodiment. 12 is fixed to the vehicle body side bracket 218 with bolts 226 and nuts 228 in a state of being sandwiched in the axial direction by the sandwiching portions 220.

FIGS. 1 to 3 show the vibration isolating bush 10 in a free-form state before press-fitting into the press-fit cylinder portion 206. As shown in FIG. 3, the anti-vibration bush 10 has an inner cylindrical fitting 12 having a cylindrical shape. And a cylindrical rubber elastic body 14 vulcanized and bonded to the outer peripheral surface thereof.
Here, the rubber elastic body 14 includes a first flange portion 16 at one axial end and a second flange portion 18 at the other axial end, each projecting in an annular shape outward in the radial direction, and the first flange portion 16 and the first flange portion 18. It has a cylindrical rubber main body 20 between the two flanges 18.
The rubber main body 20 has a shape in which an axial intermediate portion bulges outward in the radial direction over the entire circumference, and the bulging portion 22, the first flange portion 16, the second flange portion 18, and the like. The portion in between forms a thin portion 23 over the entire circumference, and an annular recess 24 is formed on the outer peripheral side of the thin portion 23.

  The first flange portion 16 is a portion that abuts against the lower clamping portion 220 in the vehicle body side bracket 218 shown in FIG. 4 during braking of the vehicle and acts as a stopper. In this embodiment, the first flange portion 16 is As shown in FIGS. 1 and 2, a part of the circumferential direction, specifically, an upper part and a lower part in a state of being attached to the vehicle have a shape projecting a predetermined dimension in the axial direction from the other part of the first flange part 16. The protruding portion forms a partial thick portion 26 in the axial direction.

Here, as shown in FIG. 2 (B), the upper and lower thick portions 26 are provided in the circumferential direction over an angle of θ (here, θ = 90 °).
Note axial thickness t ₁ of different other portion and the thick portion 26 in the first flange portion 16 here is 4 mm.

  As shown in FIG. 2A, the bulging portion 22 gradually decreases in diameter toward the flat portion 22a having a large diameter and from the flat portion 22a toward the bottom of the recess 24, that is, toward the thin portion 23. A taper-shaped portion (diameter-reducing portion) 22b, and a thickness protruding in a direction perpendicular to the axis from the axial end of the flat portion 22a to the bottom of the recess 24, specifically, the axial middle portion of the bottom. The meat part 28 is partially formed in the circumferential direction.

Specifically, thick portions 28 are partially formed on the upper and lower portions (upper and lower portions in the vehicle assembled state) of the rubber main body portion 20.
These thick portions 28 are also formed over an angle θ in the circumferential direction (θ = 90 °) as shown in FIG.
Further, the centers of the thick portions 28 in the circumferential direction are made to coincide with the circumferential centers of the partial thick portions 26 in the first flange 16.
These partial thick portions 28 formed in the rubber main body portion 20 are formed to harden the vertical spring characteristics of the vibration isolating bush 10.

  On the other hand, the anti-vibration bush 10 has a spring characteristic in the left-right direction (the left-right direction in FIG. 10), and the anti-vibration bush 10 when the suspension arm 202 rotates in the arrow P direction (and the opposite direction) in FIG. In order to soften the spring characteristics in the twisting direction, the depth or / and axial length of the concave portion 24 formed on the outer peripheral side of the thin portion 23 is large, that is, the axial length of the flat portion 22a of the bulging portion 22 Is narrower than that of a normal anti-vibration bush.

  Here, the spring characteristic of the anti-vibration bushing 10 in the twisting direction is a direction in which the inner cylinder fitting 12 in the anti-vibration bushing 10 is tilted with respect to the press-fit cylinder portion 206 (a direction forming an angle α) as shown in FIG. It is a spring characteristic when it is displaced relatively.

As described above, in order to soften the spring characteristics in the left-right direction and the twisting direction while stiffening the spring characteristics in the vertical direction, the overall volume of the annular recess 24 is increased in the present embodiment.
Specifically, when the volume of the portion sandwiched between the press-fit cylinder portion 206 and the inner tube fitting 12 is 100, the portion is usually filled with a deformed rubber at a filling rate close to 100%. In this embodiment, By increasing the volume of the recess 24, the filling rate is 70% or less.

The second flange 18 is a portion that makes contact with the upper holding member 220 in the figure of the vehicle body side bracket 218 shown in FIG. 4 when starting the vehicle, and has a stopper function in this embodiment. In order to increase the thickness (to make the stopper act early), the entire axial thickness is made thicker than before. Here is specifically its axial thickness t ₂ is the 4.1 mm.
Conventional thickness _{t 2} in the Tanebofu bushing is 2 to 3 mm.

As shown in FIG. 3 (B), in the present embodiment, the second flange portion 18 has a shape protruding outward in the radial direction from the first flange portion 16 over the entire circumference. In other words, the outer diameter D ₂ of the second flange 18 is larger than the outer diameter D ₁ of the first flange 16.
Here to the outer diameter _D 1 = 34 mm of the first flange portion 16 in the pressed state of the press-fit tube portion 206 is the outer diameter _D 2 = 36 mm in the second flange portion 18.
In other words, the second flange 18 has a difference ΔD / 2 (t ₃ ) = 1 mm between D ₂ and D ₁ with respect to the first flange 16 and the second flange 18 is in the radial direction with respect to the first flange 16. It protrudes outward over the entire circumference.

In this embodiment, as shown in detail in FIG. 3B, the positioning convex portion 30 is provided in an upright state on the axial end surface of the second flange portion 18.
The positioning protrusion 30 is for positioning the vibration isolating bush 10 in the circumferential direction with respect to the press-fitting cylinder 206 when the vibration isolating bush 10 is press-fitted into the press-fitting cylinder 206. The portions 30 are provided on the second flange portion 18 at two locations that differ by 180 °.
Here, the pair of positioning protrusions 30 extend in the radial direction from the position separated from the inner cylindrical metal member 12 in the radial direction until reaching the outer peripheral end of the second flange 18.
Accordingly, a space 32 is formed between the positioning convex portion 30 and the inner cylinder fitting 12.

  When the vibration isolating bush 10 is press-fitted into the press-fitting cylinder portion 206 in this way, the circumferential positioning is required because the first flange in the vibration isolating bush 10 in the press-fitting state shown in FIG. This is because the partial thick part 26 of the part 16 and the partial thick part 28 provided on the rubber main body part 20 need to be positioned at the upper part and the lower part in the vehicle vertical direction, respectively.

Accordingly, the positioning convex portion 30 has the same circumferential position as the partial thick portions 26 and 28, that is, in the vehicle assembled state, one of the pair of positioning convex portions 30 is in the upper position and the other is in the lower position. The positioning protrusions 30 are arranged at the same position in the circumferential direction as the partial thick portions 26, 28, specifically at the center position in the circumferential direction of the thick portions 26, 28 so as to be positioned.
Note that the outer diameter D ₃ of the press-fit cylinder portion 206 shown in FIG. 4A is 37 mm, and therefore the outer peripheral end of the second flange portion 18 is located inside the outer peripheral end of the press-fit cylinder portion 206 in the press-fit state. It becomes a state.

6 to 8 show a method of manufacturing an assembly of the vibration isolating bush 10 and the suspension arm 202 by press-fitting and assembling the vibration isolating bush 10 shown in FIGS. 1 to 3 into the press-fitting cylinder portion 206 shown in FIG. A specific example is shown.
In FIG. 6, reference numeral 34 denotes a pressing jig for the vibration isolating bush 10, which has a circular pressing portion 36 and a shaft portion 38 extending from the center portion thereof.
The pressing portion 36 is provided with a circular concave portion 40 for fitting the end portion of the inner cylindrical metal member 12, and the second concave portion 18 in the vibration isolating bush 10 is continuously connected to the circular concave portion 40. A corresponding pair of positioning concave portions 42 for fitting the positioning convex portions 30 are provided.
As shown in FIG. 7 (II), a magnet 44 is embedded in the pressing jig 34 in the pressing portion 36 and around the shaft portion 38.

As shown in FIG. 7, in this manufacturing method, first, the pressing jig 34 is faced downward, and the inner cylindrical fitting 12 of the vibration isolating bush 10 is fitted to the shaft portion 38 of the pressing jig 34 in an extrapolated state.
At this time, the anti-vibration bush 10 is fitted into the shaft portion 38 of the pushing jig 34 with the second flange portion 18 facing upward.
Then, the vibration isolating bush 10 is pushed upward in the drawing and rotated, and the pair of positioning convex portions 30 of the vibration isolating bush 10 are turned into a pair of positioning concave portions of the pushing jig 34 as shown in FIG. The positioning convex portion 30 is fitted into the positioning concave portion 42 so as to match with 42.

Then, the inner cylinder fitting 12 is attracted by the magnetic force of the magnet 44, and the vibration isolating bush 10 is fixed and held on the pushing jig 34.
That is, the vibration isolating bush 10 is held by the pushing jig 34 in a state where the vibration isolating bush 10 is positioned at a predetermined assembly position in the circumferential direction with respect to the press-fitting cylinder portion 206.
Therefore, even if the operator releases his hand from the vibration isolating bush 10 in this state, the vibration isolating bush 10 does not fall off the pushing jig 34.

When the vibration isolating bush 10 is held in the positioning state by the pushing jig 34 as described above, the vibration isolating bush 10 is pressed against the press fitting cylinder portion 206 by the pushing jig 34 by the press fitting device 242 shown in FIG. In FIG. 8, it is pressed in the axial direction downward.
At this time, the pressing jig 34 is pressed downward by a preset press-fitting stroke to perform press-fitting. At this time, the vibration isolating bush 10 is press-fitted into the press-fitting cylinder 206 with the first flange 16 as the forward end.
At the time of the press-fitting, a guide jig 246 whose inner surface 245 is gradually reduced in diameter toward the press-fitting hole of the press-fitting cylinder part 206 is set on the upper side of the press-fitting cylinder part 206.

  When the anti-vibration bushing 10 is pushed downward into the press-fitting cylinder portion 206 by the set press-fitting stroke and press-fitted in the drawing, as shown in FIG. As shown in FIG. 8 (V), the elastic warp deformation is favorably upward in the drawing, and the second flange portion 18 remains on the axially outer side (upper side in the drawing) of the press-fitting cylinder portion 206 in the pushing-in completed state. It becomes.

  On the other hand, as shown in FIG. 8 (VI), the lower first flange portion 16 in the drawing is in a state of protruding downward from the press-fitting cylinder portion 206 by pressing. As such, the press-fit stroke is set with a slightly excessive stroke from the final appropriate axial assembly position (the assembly position with respect to the press-fit cylinder portion 206).

Next, as shown in FIG. 8 (VII), this time, press-fitting back is performed with a set return stroke with respect to the inner tube fitting 206 upward from the lower side in the figure.
The return stroke at this time is as small as several mm.
As a result, the second collar 18 that has been elastically warped and deformed upward in the figure returns to its shape by this return operation, and the first collar 16 on the lower side in the figure and the second collar 18 on the upper side in the figure It will be in the state which contact | adhered elastically to the lower end surface and upper end surface of the axial direction of the press injection cylinder part 206 favorable.
The guide jig 246 is removed from the set position when it is pushed downward, that is, press-fitted in the drawing.
In FIG. 4, reference numeral 48 denotes an assembly in which the vibration isolating bush 10 and the suspension arm 202 are assembled as described above.

FIG. 9 shows another embodiment of the present invention.
In this example, the second flange 18 is protruded radially outward with respect to the first flange 16 only partially in the circumferential direction.
Specifically, a radially outwardly projecting portion 46 is provided so as to be continuous with the positioning convex portion 30 here.
In this embodiment, the protruding portion 46 protrudes radially outward from the first flange portion 16, and therefore, in this example as well, the vibration isolating bush 10 is connected to the press-fit cylinder portion 206 of the first flange portion 16. When the press-fit is pushed in from the side by the set press-fit stroke, the first flange portion 18 is elastically warped and deformed in the direction opposite to the press-fit direction due to the projecting portion 46 projecting greatly outward in the radial direction. It is possible to effectively suppress the second flange portion 18 from being reduced in diameter and entering the press-fitting cylinder portion 206.
Other points are the same as in the above embodiment.

In this embodiment, compared with the case where the first flange 16 is protruded radially outward from the first flange 16 over the entire circumference, the material for forming the second flange 18 is saved, Moreover, the advantage which can reduce a weight is acquired.
Here, the protrusion 46 is provided so as to be continuous with the positioning protrusion 30, but the protrusion 46 may be provided on the first flange 18 separately from the positioning protrusion 30.

  Although the embodiment of the present invention has been described in detail above, this is merely an example, and the present invention can be configured and implemented in various forms and modes without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 10 Anti-vibration bush 12 Inner cylinder metal fitting 14 Rubber elastic body 16 1st collar part 18 2nd collar part 20 Rubber main body part 22 Bumping part 23 Thin part 24 Recessed part 26, 28 Thick part 30 Positioning convex part 34 Pushing jig 42 Positioning recess 44 Magnet 48 Assembly 202 Suspension arm 206, 208 Press-fit cylinder 246 Guide jig

Claims (7)

An inner cylinder metal fitting and a cylindrical rubber elastic body vulcanized and bonded to the outer peripheral surface of the inner cylinder metal fitting, and each rubber elastic body has an axial end projecting annularly outward in the radial direction. The first collar and the second collar at the other axial end, and the cylindrical rubber body between the first collar and the second collar,
A flange portion of the mating member that protrudes radially outward is press-fitted in an axial direction with respect to a press-fit cylinder portion that does not have axial end portions, and the rubber main body portion includes the inner cylinder fitting and the press-fit cylinder portion. And the first collar part and the second collar part are press-fitted and assembled to the mating member in a state where the first collar part and the second collar part are located on the outer side in the axial direction of the press-fitting cylinder part, and the press-fitting direction at the time of the press-fitting is The anti-vibration bush with both end flanges in a form limited to one direction with the first flange as the forward end of press-fitting,
At least a part of the circumferential direction of the second collar part has a shape protruding radially outward from the first collar part ,
A portion of the second flange portion that protrudes radially outward from the first flange portion is located radially inward from the outer peripheral end of the press-fit cylinder portion of the mating member in the press-fit assembly state. anti-vibration bush and said that you have none.   2. The vibration-isolating bushing according to claim 1, wherein the second flange portion has a shape projecting radially outward from the first flange portion over the entire circumference.   2. The vibration-isolating bushing according to claim 1, wherein only a part of the second flange part in the circumferential direction protrudes radially outward from the first flange part. In any one of claims 1-3, wherein the first flange portion, a portion of the circumferential direction is a shape that protrudes in the axial direction with respect to the other portion, the portion of the axial thickness of said other Anti-vibration bush characterized by being thicker than the part. An inner cylinder metal fitting and a cylindrical rubber elastic body vulcanized and bonded to the outer peripheral surface of the inner cylinder metal fitting, and each rubber elastic body has an axial end projecting annularly outward in the radial direction. The first collar and the second collar at the other axial end, and the cylindrical rubber body between the first collar and the second collar,
It is press-fitted in the axial direction with respect to the press-fit cylinder part of the mating member, the rubber main body part is sandwiched between the inner cylinder fitting and the press-fit cylinder part, and the first hook part and the second hook part are press-fitted. A configuration in which the press fitting is performed on the mating member so as to be positioned on the outer side in the axial direction of the cylindrical portion, and the press fitting direction at the time of the press fitting is limited to one direction in which the first flange portion is the forward side of the press fitting. Anti-vibration bushing with both end flanges,
Anti-vibration by assembling an anti-vibration bush with both-end hooks in a shape in which at least part of the circumferential direction of the second hook part protrudes radially outward from the first hook part. When manufacturing the bush assembly,
The inner surface gradually decreases in diameter toward the press-fitting hole of the press-fitting cylinder part, and a guide jig for setting (press-fitting) the first flange part toward the press-fitting hole is set, and the second flange part side is set. And holding the anti-vibration bush at the end of the inner tube bracket with a pressing jig,
With respect to the press-fit cylinder part from the side of the first collar part, the first collar part is caused to be elastically warped in the direction opposite to the press-fitting direction of the second collar part. Press in the set press-fitting stroke to the position where it protrudes from the press-fitting cylinder, and press fit.
Next, the vibration isolating bushing is returned from the side of the first flange part by a set return stroke in a direction opposite to the press-fitting direction while restoring the shape of the elastically deformed second flange part, A method of manufacturing an anti-vibration bushing assembly comprising assembling to a press-fit cylinder part. 6. The vibration isolating bushing according to claim 5 , wherein a part of the first flange portion in the circumferential direction protrudes in the axial direction with respect to the other part, and the part of the vibration isolating bush is partially axially thick. Is a thick and thick part,
The second flange portion has a positioning convex portion for positioning in the circumferential direction with respect to the press-fit cylinder portion on an axially outer end surface,
The pushing jig includes a magnet that attracts the axial end surface of the inner cylindrical metal fitting with a magnetic force and a positioning recess that fits into the positioning projection, and the positioning projection fits into the positioning recess. The method of manufacturing a vibration-proof bushing assembly is characterized in that the inner cylinder fitting can be attracted by the magnet. In Claim 6 , the said convex part for positioning is provided in the shape extended radially outward from the position away from the said inner cylinder metal fitting in the radial direction, Between this positioning convex part and this inner cylinder metal fitting A method for manufacturing a vibration-proof bushing assembly, wherein a space is formed.

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