JP5841813B2 - Vibration isolator - Google Patents

Description

  The present invention relates to a vibration isolator including a mounting bracket attached to a vibration source side, a mounting bracket attached to a vibration receiving side, and a rubber elastic body connecting the mounting brackets.

  When this type of vibration isolator is attached to the vibration receiving side, the mounting leg formed on the mounting bracket is directly bolted to the vibration receiving side member, or the mounting bracket is attached to a bracket fixed to the vibration receiving side. Often attached.

  For example, in Patent Document 1, a plate piece that forms a part of a mounting bracket of a vibration-proof member is used for an engaging portion provided on a bracket attached to the fixed side (vibration receiving side). A technique is disclosed in which the vibration isolator is assembled to the bracket by being bent along the line.

JP 2004-290999 A

  However, the anti-vibration member is attached to the bracket by bending a plate piece (plate part) forming a part of the mounting bracket of the anti-vibration member (vibration isolation device) along the cross-sectional shape of the engaging portion provided on the bracket. When assembling, there are the following problems.

  That is, in the vibration isolator 101 as shown in FIG. 8A, the rubber elastic body 107 includes the mounting member 105 attached to the inner peripheral surface of the substantially cylindrical mounting member 103 attached to the vibration source side and the vibration receiving side. In many cases, not only the protruding portion 115 but also the plate portion 125 of the mounting bracket 105 is covered to prevent the mounting bracket 105 from rusting. Then, the plate portion 125 covered with the rubber elastic body 107 is bent toward the engaging portion 111d at the base portion 115a of the protruding portion 115 as shown in FIG. Is attached to the bracket 111, stress remains in the bent portion (the portion indicated by reference numeral 127d in FIG. 9B) of the rubber elastic body 107. With the stress remaining in the bent portion 127d in this way, as shown in FIG. 9A, a load is input to the vibration isolator 101 and the rubber elastic body is pulled upward (in the direction of the white arrow). When the tensile force is applied to the bent portion 127d where the stress remains, tensile stress is generated in a superimposed manner. In other words, a large stress is generated in the bent portion 127d, and the rubber elastic body 107 is cracked from this point. May occur.

  In order to solve such a problem, for example, the rubber elastic body 107 may be bonded to the mounting bracket 105 so as to cover only the protruding portion 115 of the mounting bracket 105. In addition, it is difficult to prevent rubber from spreading around the plate portion 125 during vulcanization molding, and additional rust prevention coating or the like is required for the plate portion 125, resulting in a new problem that man-hours and costs increase.

  The present invention has been made in view of the above points, and an object of the present invention is to provide a vibration isolator of a type that is assembled to a member on a vibration receiving side by bending a plate portion of a mounting bracket. The object is to provide a technique for suppressing the occurrence of cracks at the corners.

  In order to achieve the above object, in the vibration isolator according to the present invention, a load is input to the vibration isolator at a portion (bending angle) where the stress remains by bending the plate portion of the rubber elastic body. Therefore, when the rubber elastic body is pulled upward, the shape of the rubber elastic body in the vicinity of the bending angle is made a shape that hardly transmits the tensile force in order to prevent the tensile stress from being generated in a superimposed manner.

  Specifically, the first invention connects the first mounting bracket attached to the vibration source side, the second mounting bracket attached to the vibration receiving side, and the first mounting bracket and the second mounting bracket. A vibration isolator provided with a rubber elastic body is an object.

The second mounting bracket includes a plate portion and a protruding portion protruding from the plate portion toward the first mounting bracket, and the plate portion is connected to the first portion at the base portion of the protruding portion. The rubber elastic body is fixed to the member on the vibration receiving side by being bent to the opposite side of the mounting bracket, and the rubber elastic body is attached to the second mounting bracket so as to cover the protruding portion and the plate portion. It is bonded, and, in the rubber elastic body, the portion corresponding to the root portion located in the flared flange of the plate area when bending the plate portion are recessed portion is formed, the recess The portion is formed only in a portion of the rubber elastic body corresponding to the base portion located at the bent edge portion of the plate portion when the plate portion is bent .

  According to 1st invention, when the plate part is bent, the hollow part is formed in the site | part corresponding to the base part of the protrusion part located in the bending edge part of the said plate part at the rubber elastic body. In other words, because the thickness of the rubber at such a portion is thin, even if a load is input to the vibration isolator and the rubber elastic body is pulled upward, the thickness of the rubber is thin. Transmission of tensile force is suppressed at the site. As a result, the tensile stress is superimposed on the portion (bending angle) where the stress remains by bending the plate portion in the rubber elastic body, in other words, the large stress is generated. It can suppress and it can suppress that a crack arises in the bending angle of a rubber elastic body.

Here, even if stress remains at the bending angle of the rubber elastic body by bending the plate portion, even if the rubber elastic body is pulled upward at the bending angle away from the base of the protruding portion, it is large. Tensile stress is unlikely to occur. Therefore, according to the first invention, when the plate portion is bent, the recessed portion is formed only in the portion corresponding to the base portion of the protruding portion located at the bent edge of the plate portion. The generation of tensile stress can be efficiently suppressed as compared with the case where the base portion is recessed over the entire circumference. In addition, according to the first invention, when the rubber elastic body is vulcanized and molded in the mold, there are few portions that inhibit the flow of the rubber, so that the rubber as the rust inhibitor can be spread over the entire plate portion. .

According to a second invention, in the first invention, the vibration source is an engine, the vibration receiver is a vehicle body, and the member on the vibration receiver side is substantially horizontal in a mounting bracket attached to the vehicle body. The first mounting bracket is positioned above the second mounting bracket, and the plate portion is formed in a substantially rectangular shape, while the projecting portion is The center part of the plate part is formed in a top cylindrical shape that bulges upward, and the second mounting bracket has the protruding part placed on the upper surface of the beam part , and the longitudinal direction of the plate part is The plate portion is bent so as to wrap around the beam portion from a state intersecting with the extending direction of the beam portion, and is caulked and fixed to the beam portion.

According to the second invention, the first invention can be suitably used for an engine mount.

  According to the vibration isolator according to the present invention, when the plate portion is bent, the rubber elastic body has a recess portion at a portion corresponding to the base portion of the protruding portion located at the bent edge portion of the plate portion. Therefore, when the load is input to the vibration isolator and the rubber elastic body is pulled upward, the tensile force acting on the rubber elastic body is stressed by bending the plate portion. Transmission to the bending angle of the rubber elastic body can be suppressed, and cracking of the rubber elastic body can be suppressed.

It is a perspective view which shows the engine mount which concerns on embodiment of this invention. It is a perspective view which shows the state which attached the engine mount to the vehicle body via the attachment bracket. It is sectional drawing of an engine mount, the figure (a) is a general view, The figure (b) is an enlarged view of the A section of the figure (a). It is sectional drawing which shows the state which attached the engine mount to the attachment bracket, The figure (a) is a general view, The figure (b) is an enlarged view of the A section of the figure (a). It is arrow sectional drawing of the VV line | wire of FIG. It is sectional drawing of the engine mount in the state by which the load was input into the vibration isolator and the rubber elastic body was pulled upwards, the figure (a) is a general view, the figure (b) is the figure (a). It is an enlarged view of the A section. It is sectional drawing of the engine mount which concerns on other embodiment, the figure (a) is a general view, The figure (b) is a figure which shows the state which attached the engine mount to the attachment bracket. It is sectional drawing of the conventional engine mount, The figure (a) is a general view, The figure (b) is a figure which shows the state which attached the engine mount to the attachment bracket. It is sectional drawing of the conventional engine mount in the state in which the load was input into the vibration isolator and the rubber elastic body was pulled upwards, the figure (a) is an overall view, and the figure (b) is the figure ( It is an enlarged view of the A section of a).

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. 1, 3, 4, 6, and 7, in order to make the drawings easy to see, the first mounting bracket 3, the second mounting bracket 5, the rubber elastic body 7, and the stopper rubber in the engine mount 1. Only 19 are shown.

  FIG. 1 is a perspective view showing an engine mount according to an embodiment of the present invention. The engine mount (anti-vibration device) 1 is attached to the first mounting bracket 3 attached to the vibration source side (in the present embodiment, the engine 21 side) and the vibration receiving side (in the present embodiment, the vehicle bodies 31 and 41 side). The second mounting bracket 5, the rubber elastic body 7 connecting the first mounting bracket 3 and the second mounting bracket 5, an orifice panel (not shown), a diaphragm 9 (see FIG. 2), the first 1 is a liquid-filled engine mount provided with a pair of stopper rubbers 19 attached to one mounting bracket 3.

  As shown in FIG. 2, the engine mount 1 includes a side frame 31 and a tire house 41 in which the first mounting bracket 3 is mounted on the engine 21, while the second mounting bracket 5 is provided on the vehicle body and extends in the vehicle front-rear direction. It can be attached to the vehicle body side by being attached to the attachment bracket 11 attached to the vehicle body.

  The mounting bracket 11 is made of aluminum die-casting, each of a pair of leg portions 11a and 11b extending in the vertical direction, an upper beam portion 11c connecting the upper ends of the pair of leg portions 11a and 11b, and the pair of legs. A lower beam portion 11d that has a substantially rectangular cross-section extending in a substantially horizontal direction and connecting the central portions of the portions 11a and 11b. Thus, a first fastening portion 11e for attaching the leg portion 11a to the side frame 31 is provided at the lower end of one leg portion 11a (left side in FIG. 2), while the other (right side in FIG. 2). The second fastening portion 11f for attaching the leg portion 11b to the side frame 31 is provided at the lower end portion of the leg portion 11b. Further, a third fastening portion 11g for attaching the leg portion 11b to the tire house 41 is provided at the upper end portion of the leg portion 11b.

  The first and second fastening portions 11e and 11f are respectively formed with bolt holes 11h and 11i extending in the vertical direction, while the third fastening portion 11g is formed with a bolt hole 11j extending obliquely downward. The mounting bracket 11 is fixed to the vehicle bodies 31 and 41 by bolts (not shown) inserted through the bolt holes 11h, 11i, and 11j.

  As shown in FIG. 3, the first mounting bracket 3 is located above the second mounting bracket 5, and has a substantially cylindrical bracket body 13 and an attachment formed outside the bracket body 13. It consists of a part 23, and is attached to the engine 21 by a bolt (not shown) inserted through three bolt holes 23a formed through the attachment part 23.

  The second mounting bracket 5 has a plate portion 25 in which a substantially rectangular metal plate is bent in an L shape, and a central portion of the plate portion 25 is bulged upward (toward the first mounting bracket 3). And a projecting portion 15 having a crested cylindrical shape.

  The rubber elastic body 7 is integrally vulcanized with the first mounting bracket 3 and the second mounting bracket 5 in a mold (not shown), and has a rubber main body portion 17 and a thin film portion 27. As shown in FIG. 3A, the rubber main body portion 17 has a lower concave portion 17 b that opens downward at the lower portion thereof, and the inner peripheral surface of the lower concave portion 17 b covers the protruding portion 15. In this way, the first mounting bracket 5 is vulcanized and bonded, and extends obliquely upward from the entire circumference of the protrusion 15 so as to cover the substantially lower half of the inner peripheral surface of the bracket body 13. The mounting bracket 3 is vulcanized and bonded. Thereby, the rubber elastic body 7 is formed in a substantially inverted truncated cone shape having a mortar-shaped upper concave portion 17c that is open upward. On the other hand, the thin film portion 27 is integrally formed with the lower end portion of the rubber main body portion 17 and has a thickness of about 1 mm. The thin film portion 27 covers substantially the entire surface of the plate portion 25 and the inner peripheral surface of the protruding portion 15. 2 It plays a role as a rust stop for the mounting bracket 5.

  Thus, after connecting the first mounting bracket 3 and the second mounting bracket 5 with the rubber elastic body 7 (the rubber elastic body 7 is integrally added to the first mounting bracket 3 and the second mounting bracket 5 in the mold). After the sulfur molding, an orifice board (not shown), a diaphragm 9 and the like are fitted on the inner peripheral side of the metal fitting main body 13 of the first mounting fitting 3 and surrounded by the upper concave portion 17c formed in a mortar shape and the diaphragm 9. The liquid-filled engine mount 1 is configured by sealing an incompressible fluid in the space.

  Then, as shown in FIG. 4A, the liquid-filled engine mount 1 is positioned after placing the L-shaped bent portion 25a of the second mounting bracket 5 against the corner of the lower beam portion 11d. By bending the plate portion 25 downward (on the side opposite to the first mounting bracket 3) at the base portion 15a of the protruding portion 15, the plate portion 25 is bent along the cross-sectional shape of the lower beam portion 11d. The lower beam portion 11d is fixed. In other words, the second mounting bracket 5 is configured so that the projecting portion 15 is placed on the upper surface of the lower beam portion 11d and the longitudinal direction of the plate portion 25 intersects the extending direction of the lower beam portion 11d. By bending the plate portion 25 so as to surround the beam portion 11d, the plate portion 25 is caulked and fixed to the lower beam portion 11d. The “base portion of the protruding portion” means a portion at the time when the protruding portion 15 rises from the plate portion 25.

  Thereby, in the engine mount 1, for example, when the automobile is stopped and the engine 21 is in an idle operation state, low-frequency idle vibration caused by torque fluctuation or the like is absorbed by the rubber elastic body 7, and vibration to the vehicle body is caused. Transmission is suppressed. On the other hand, for example, when a large driving reaction force (torque) acts and the engine 21 tends to swing back and forth as in the case of sudden acceleration of an automobile, the pair of stopper rubbers 19 abut against the leg portions 11a and 11b of the mounting bracket 11. As a result, the front and rear deformation of the rubber elastic body 7 is restricted, and when the engine 21 tries to swing up and down, the pair of stopper rubbers 19 come into contact with the upper beam portion 11c of the mounting bracket 11, thereby the rubber elastic body. The upper and lower deformations of 7 are limited.

  By the way, in the present embodiment, as described above, the plate portion 25 of the second mounting bracket 5 is bent downward at the base portion 15a of the projecting portion 15 to assemble the engine mount 1 to the mounting bracket 11. Such an assembly structure has the following problems. That is, among the four bent portions of the plate portion 25 shown in FIG. 4 (a), the bent portion 25a at the upper right in the figure covers the thin portion 27 with respect to the previously bent portion, so that the corner of the rubber The portion 27a is not stressed by bending the plate portion 25. Further, in the lower right and lower left bent portions 25b and 25c in the figure, the plate portion 25 is bent after the thin film portion 27 is covered, so that the plate portion 25 is bent at the rubber bent corner portions 27b and 27c. However, since these bending corners 27b and 27c are located away from the lower end of the rubber main body 17, they are hardly affected even if the rubber main body 17 is deformed.

  On the other hand, in the bent portion 25d at the upper left of the figure, the plate portion 25 is bent after the thin film portion 27 is coated, so that the bent corner portion 27d (hereinafter simply referred to as “ In the bending corner portion 27d ", stress remains by bending the plate portion 25 and is located near the lower end portion of the rubber main body portion 17, so that a load is input to the engine mount 1 to enter the rubber main body. When the portion 17 is pulled upward, a tensile stress to which a tensile force is transmitted is superimposed on the bending corner portion 27d where the stress remains, and the rubber elastic body 7 may crack from this point. There is.

  Therefore, in the engine mount 1 of the present embodiment, as shown in FIGS. 1, 3B and 5, when the plate portion 25 of the rubber elastic body 7 is bent, the bent edge portion of the plate portion 25 is folded. The recessed portion 37 is formed only in the portion 27e corresponding to the base portion 15a located at 25e. In other words, in the engine mount 1, the rubber covering the portion of the annular base portion 15a of the second mounting bracket 5 that is close to the bent edge portion 25e of the plate portion 25 when the plate portion 25 is bent. A recess 37 is formed only in the main body 17.

  In this way, by forming the depression 37, as shown in FIG. 4 (b), the bent corner 27d in which the stress remains by bending the plate 25 in the rubber elastic body 7, and the rubber Since a thin portion is formed between the main body portion 17 and FIG. 6A, even when a load is applied to the engine mount 1 and the rubber main body portion 17 is pulled upward as shown in FIG. As is clear from a comparison between FIG. 6B and FIG. 6B, the tensile force is not transmitted to the portion below the hollow portion 37, and the generation of the tensile stress in the bending corner portion 27d is suppressed. Can do. Therefore, it is possible to divide the residual stress and the tensile stress in the rubber elastic body 7 and suppress the occurrence of cracks in the bending angle of the rubber elastic body 7.

  Moreover, in order to confirm the effect which suppresses generation | occurrence | production of the tensile stress by this hollow part 37, the engine mount 1 which formed the hollow part 37 in the site | part 27e corresponding to the root part 15a located in the bending edge part 25e of the plate part 25 ( Example of the present invention) and an engine mount (comparative example) having the same configuration as that of the example of the present invention except that the hollow portion 37 is not formed. It was confirmed that the stress generated in the bending corner portion 27d was reduced to about 64% of the stress generated in the same portion in the comparative example.

  In addition, the hollow part 37 can be easily formed by projecting the site | part corresponding to the hollow part 37 in a metal mold | die toward the root part 15a of the 2nd attachment bracket 5, for example. Thus, when the part corresponding to the hollow part 37 in the mold is protruded, the gap between the mold and the second mounting bracket 5 becomes narrow at the part, and the injected rubber material spreads to the plate part 25. Although it becomes difficult, in the present embodiment, when the plate portion 25 is bent, the depression portion 37 is formed only in the portion 27e corresponding to the base portion 15a located at the bent edge portion 25e of the plate portion 25, so that as rust prevention The thin film portion 27 can be spread over the entire plate portion 25.

-Effect-
According to the present embodiment, when the rubber elastic body 7 is bent, the recessed portion 37 is formed in the portion 27e corresponding to the base portion 15a of the protruding portion 15 located at the bent edge portion 25e of the plate portion 25. In other words, the thickness of the rubber at such a portion is reduced. Therefore, even if a load is input to the liquid-filled engine mount 1 and the rubber body 17 is pulled upward, the rubber By bending the plate portion 25 in the elastic body 7, it is possible to suppress a tensile stress from being generated at a portion where the stress remains (bending corner portion 27d). Thereby, the residual stress and the tensile stress can be divided, and the occurrence of cracks in the bent corner portion 27d of the rubber elastic body 7 can be suppressed.

(Other embodiments)
The present invention is not limited to the embodiments, and can be implemented in various other forms without departing from the spirit or main features thereof.

  In the said embodiment, although the vibration isolator was used as the engine mount 1, it is not restricted to this, if the vibration isolator is fixed to an object member by bending the plate part 25 by the base part 15a of the protrusion part 15. It may be used for other purposes.

  In the above embodiment, the engine mount 1 is a liquid-filled engine mount. However, the present invention is not limited to this. For example, the first mounting bracket 3, the second mounting bracket 5, the rubber elastic body 7, and the stopper rubber 19 are used. It is good also as a vibration isolator which does not enclose the liquid provided with these.

  Furthermore, in the said embodiment, although the plate part 25 was formed in L shape, it is not restricted to this, For example, as shown in FIG. 7, the plate part 25 is formed flat and the longitudinal direction which pinched | interposed the protrusion part 15 Both sides may be bent and fixed to the lower beam portion 11d by caulking. In this case, as shown in FIG. 7, it is necessary to form a recess 37 at a site corresponding to the base portion 15a of the protruding portion 15 located at the bent edge portions 25e on the left and right sides.

  Moreover, in the said embodiment, although the protrusion part 15 was formed in the top cylindrical shape, you may form not only this but the protrusion part 15 in a top square tube shape, a prismatic shape, and a column shape.

  As described above, the above-described embodiment is merely an example in all respects and should not be interpreted in a limited manner. Further, all modifications and changes belonging to the equivalent scope of the claims are within the scope of the present invention.

  As described above, the present invention is useful for a vibration isolator of the type that is assembled to a member on the vibration receiving side by bending the plate portion of the mounting bracket.

1 Liquid-filled engine mount (anti-vibration device)
3 First mounting bracket 5 Second mounting bracket 7 Rubber elastic body 11 Mounting bracket 11d Lower beam portion (beam portion ( member on vibration receiving side))
15 Projection 15a Base 21 Engine (vibration source)
25 Plate part 25e Bending edge part 31 Side frame (vibration receiver)
37 hollow part 41 tire house (vibration receiver)

Claims (2)

A vibration isolator comprising: a first mounting bracket attached to a vibration source side; a second mounting bracket attached to a vibration receiving side; and a rubber elastic body connecting the first mounting bracket and the second mounting bracket. There,
The second mounting bracket has a plate portion and a protruding portion protruding from the plate portion toward the first mounting bracket, and the plate portion is connected to the first mounting bracket at a base portion of the protruding portion. Is fixed to the member on the vibration receiving side by bending to the opposite side,
The rubber elastic body is bonded to the second mounting bracket so as to cover the protruding portion and the plate portion, and the rubber elastic body has a bent edge of the plate portion when the plate portion is bent. In a portion corresponding to the base portion located in the portion, a depression is formed ,
The said hollow part is formed only in the site | part corresponding to the said base part located in the bending edge part of the said plate part when the said plate part is bent in the said rubber elastic body, apparatus. In the vibration isolator according to claim 1 Symbol placement,
While the vibration source is an engine, the vibration receiver is a vehicle body,
The member on the vibration receiving side is a beam portion having a substantially rectangular cross section extending in a substantially horizontal direction of a mounting bracket attached to the vehicle body,
The first mounting bracket is located above the second mounting bracket,
While the plate portion is formed in a substantially rectangular shape, the protruding portion is formed in a top cylindrical shape in which the central portion of the plate portion is bulged upward,
The second mounting bracket is configured so that the protruding portion is placed on the upper surface of the beam portion , and the plate portion is wrapped around the beam portion from a state where the longitudinal direction of the plate portion intersects the extending direction of the beam portion. An anti-vibration device characterized by being caulked and fixed to the beam portion by bending.

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