JP2010281409A - Buffer elastic plate - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a buffer elastic plate sufficiently relaxing contact shock of a vehicle side mounting bracket and an engine side mounting bracket, effectively preventing transmission of vibration to an inner tube of the engine mount or the like even if vibration caused by contact of an outer tube of the engine mount and/or the mounting bracket surrounding the outer tube is generated in acceleration of the vehicle, and removing risk of resonance of the vehicle side mounting bracket, vehicle body panel, and the like with the vibration, in application of a bush type engine mount. <P>SOLUTION: This buffer elastic plate is disposed on the inner tube of the bush type engine mount connected to the vehicle body and the engine respectively, and relaxes contact shock of the vehicle side mounting bracket and the engine side mounting bracket. A notch 9 positioned separately from an circumference surface of the inner tube is disposed at a through-hole 8a of the buffer elastic plate 8 by which the same is fitted to the inner tube and is supported on the inner tube. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an improvement of a shock absorbing elastic plate that is disposed on an inner cylinder of a bush type engine mount and that mitigates a collision impact between a mounting bracket on the vehicle body side and a mounting bracket on the engine side.

  For example, the horizontal engine type F.I. In car F, when mounting a bush type engine mount that supports the engine in a suspended form, the outer cylinder fitting of the engine mount and the mounting bracket that supports the inner cylinder fitting of the engine mount are in direct contact with each other. In order to prevent this, Patent Document 1 discloses a technique in which an elastic stopper as a buffer elastic plate is disposed between an outer cylinder fitting and a mounting bracket.

  This elastic stopper is formed in the shape of the end face of the elastic member between a disk portion having a predetermined thickness larger than the outer cylinder fitting of the engine mount and a space in the elastic member of the engine mount on one surface of the disk portion. In a state where a predetermined gap is formed between the disk part and the outer cylinder fitting of the engine mount, which is formed to protrude with a corresponding shape, it is closely attached to the end face of the elastic member between the engine mount cavities with a predetermined preload. The first projecting portion to be fastened and the other surface of the disk portion are protruded from a portion corresponding to the projecting portion of the first projecting portion, and are attached to the arm portion of the mounting bracket with a predetermined preload. According to this, the elastic member end surface of the bush type engine mount comes into contact with the arm portion of the mounting bracket via the elastic stopper. Longitudinal direction of the spring characteristic of the vehicle becomes sufficiently stiff in a small load region, therefore, the engine can satisfactorily suppressed in the front-rear direction to the relative movement of the vehicle relative to the vehicle body.

Microfilm of Japanese Utility Model Application No. 61-46359 (Japanese Utility Model Application Publication No. 62-158238)

  However, in this prior art, the disk portion larger in diameter than the outer cylinder fitting of the engine mount is made thinner, so in the first place, this elastic stopper is the axial direction of the inner and outer cylinder fittings due to sudden acceleration, sudden deceleration, etc. of the vehicle Due to the occurrence of a large relative displacement, there has been an essential problem in the function of the elastic stopper that the impact when the outer cylinder of the engine mount abuts against the arm portion of the mounting bracket cannot be sufficiently mitigated.

  The present invention has an object to solve such problems of the prior art, and the object of the present invention is to apply a mounting bracket on the vehicle body side in application of a bush type engine mount. The shock absorbing elastic plate can sufficiently reduce the impact shock with the mounting bracket on the engine side, and the shock absorbing elastic plate surrounds the outer cylinder of the engine mount and / or the outer cylinder when the vehicle is accelerated or decelerated. Even if it is vibrated due to contact with the mounting bracket, the vibration is effectively prevented from being transmitted to the inner cylinder of the engine mount. Suitable for use in bush-type engine mounts that can effectively eliminate the possibility of causing resonance and, in turn, the possibility of increasing vehicle interior noise and vibration. To provide a 衝弾 resistance plate.

  The present invention is arranged on an inner cylinder of a bush type engine mount that is connected to each of the vehicle body and the engine, and mitigates the impact shock between the vehicle body side mounting bracket and the engine side mounting bracket. In the shock-absorbing elastic plate having a required thickness, the contour shape outside the plane can be circular, oval, elliptical, fan-shaped, polygonal, or other shape. A through-hole is used to suppress transmission of vibrations that may occur in the shock-absorbing elastic plate to the inner cylinder of the engine mount by contact with at least one of the mounting brackets surrounding the outer cylinder by caulking or the like. One or more notches positioned away from the peripheral surface of the inner cylinder are provided in the through-holes of the shock absorbing elastic plates that are fitted to the inner cylinder and supported on the inner cylinder. It is.

In addition, since the recessed part formed in the through hole of the buffer elastic plate and engaged with the protrusion provided on the inner cylinder comes into contact with the inner cylinder, more directly, the inner cylinder protrusion. It is not included in the “notch”.
Therefore, when a plurality of notches having the same shape as the recesses for preventing rotation are provided and any one of these notches is engaged with a protrusion provided on the inner cylinder to function as a recess, the remaining notch The notches are included in the concept of “notches” in the present invention.

By the way, a plurality of such notches can be provided at a required interval in the circumferential direction of the through hole, and only one is provided continuously in the circumferential direction of the through hole over an angular range of less than 180 °. You can also.
Here, the reason why the angle range of one continuous notch is less than 180 ° is that when the range is 180 ° or more, it is difficult to position and dispose the buffer elastic plate on the inner cylinder.

  More preferably, at least one thin portion positioned around the through hole is provided in a transmission path of vibration that may be generated in the buffer elastic plate to the inner cylinder side of the engine mount.

In this case, the buffer elastic plate has a plurality of ribs that extend in the radial direction from the inner cylinder side on at least one side, or a plurality of ribs that have the required cross-sectional shape, or a plurality of ribs extending in the radial direction from the inner cylinder side. A thin wall around a through-hole that has a plurality of fan-shaped parts partitioned by a groove and reduces the protruding height or thickness of one or more ribs or one or more fan-shaped parts A part may be provided.
Therefore, here, ribs, fan-shaped portions and the like can be formed on both front and back surfaces of the buffer elastic plate.

  In addition, the shock absorbing elastic plate has a uniform thickness with a sufficient thickness throughout, and is endless in the circumferential direction of one or more or the through holes located around the through hole of the shock absorbing elastic plate. A continuous thin wall portion may be provided.

  In any of these cases, a thin portion that overlaps in the radial direction or a portion that does not overlap at all can be provided at a plurality of locations in the radial direction with respect to the center of the through hole. .

  According to the shock-absorbing elastic plate of the present invention, the plane contour shape is appropriately selected, and the shock-absorbing elastic plate having a thickness according to necessity is fitted on the inner cylinder of the bush type engine mount with a through hole. For example, by placing each of the paired shock absorbing elastic plates between the engine side mounting bracket that surrounds the outer cylinder of the engine mount and the vehicle body side mounting bracket, The contact impact can be effectively reduced by the buffer elastic plate having a sufficient thickness.

  On the other hand, due to sudden acceleration, sudden deceleration, etc. of the vehicle, the engine side mounting bracket and / or the outer cylinder of the engine mount come into contact with the peripheral portion of the buffer elastic plate, and the engine side vibration is attenuated. Even if the vibration is transmitted to the buffer elastic plate without being absorbed, the vibration and force transmitted to the buffer elastic plate are transmitted to the inner cylinder through the buffer elastic plate. Since it is effectively blocked by a notch that is formed in the hole and is spaced apart from the peripheral surface of the inner cylinder, the vehicle body side bracket that connects the inner cylinder is from vibration transmission via the buffer elastic plate. It will be effectively protected.

  Therefore, it is possible to effectively eliminate the possibility that the vehicle body side mounting bracket, the vehicle body panel and the like will resonate due to the engine vibration or the like input to the buffer elastic body, and effectively prevent an increase in noise and vibration in the vehicle interior. be able to.

  And this means that a plurality of circumferentially spaced notches are provided around the through hole of the buffer elastic plate, or the circumferential direction is continuous over an angular range of less than 180 ° around the through hole. By providing one notch, it is possible to secure a wide area where vibrations input to the buffer elastic plate can be blocked from the inner cylinder, and to increase the probability of blocking the vibration transmission path to the inner cylinder side of the engine mount. It is effective.

  Furthermore, in addition to the above, in the case where one or more thin portions located around the through hole are provided in the transmission path of the vibration transmitted to the buffer elastic plate to the inner cylinder side of the engine mount. The transmission rate of the vibration input to the buffer elastic plate to the inner cylinder can be reduced by the thin portion, so that the possibility of resonance of the vehicle body side mounting bracket, the vehicle body panel, etc. can be more effectively removed. it can.

  Here, the shock absorbing elastic plate has a plurality of ribs extending in the radial direction from the inner cylinder side or a plurality of fan-shaped portions defined by a plurality of grooves extending in the radial direction. When the rib or the one or more fan-shaped parts are provided with a thin part that reduces the protruding height or thickness, it is easy to identify the transmission path of vibration input to the buffer elastic body. Therefore, it is possible to simplify the formation at an appropriate position.

  On the other hand, when the buffer elastic plate has a uniform required thickness throughout, it is difficult to accurately specify the transmission path of vibration input to the buffer elastic body to the inner cylinder side. In this case, by providing a plurality of thin portions positioned around the through hole of the elastic plate at a required interval, or by providing an endless continuous thin portion in the circumferential direction of the through hole, Transmission of input vibration to the inner cylinder side can be effectively reduced.

  The vibration input to the buffer elastic body is transmitted to the inner cylinder side in the case where a thin portion that overlaps in the radial direction is provided at a plurality of locations in the radial direction with respect to the center of the through hole. Since the transmission of vibration can be more advantageously limited, the transmission of vibration to the vehicle body side is more effectively suppressed.

  In this case, when the protrusions that overlap in the radial direction over a part or the whole in the radial direction with respect to the central axis of the inner cylinder are provided or do not overlap at all, the intrinsic function of the buffer elastic plate The impact shock of both mounting brackets can be more effectively reduced.

It is an approximate line top view of an engine room in which an example of application of a buffer elastic board concerning this invention is shown notionally. It is a principal part expanded sectional view of FIG. It is sectional drawing which passes along a center axis line which illustrates a bush type engine mount. It is a figure which shows embodiment of this invention. It is a figure which illustrates the input mode of the vibration to a buffer elastic board. It is a figure which shows other embodiment of this invention.

  In the application example of the shock-absorbing elastic plate shown in FIG. 1, reference numeral 1 denotes an engine room, 2 denotes a horizontal engine disposed in the engine room 1, 3 denotes a vehicle body, and 4 denotes a vehicle body. The respective mounting devices for suspending and supporting the front and rear ends of the engine 2 on the vehicle body 3 within the engine rule 1 are shown.

  Here, as shown in FIG. 2 in an enlarged manner, the mounting device 4 shown in the figure includes a vehicle body side mounting bracket 5 attached to the vehicle body 3, an engine side mounting bracket 6 attached to the engine 2, and the engine side. A bush-type engine mount 7 in which the cylindrical portion 6a of the mounting bracket 6 is fixed around by caulking or the like is provided, and is disposed on the inner cylinder 7a of the engine mount 7 so that the vehicle body side mounting bracket 5 And a pair of shock-absorbing elastic plates 8 that alleviate the impact impact with the engine-side mounting bracket 6.

  The bush-type engine mount 7 here is, for example, an inner cylinder 7a and an outer cylinder arranged around the inner cylinder 7a as shown in a sectional view passing through the central axis in FIG. The cylinder 7b and the inner and outer cylinders 7a and 7b can be constituted by an elastic member 7c, for example, rubber, fixed by vulcanization adhesion or the like, and a plurality of circumferentially spaced intervals are provided in the elastic member 7c. It is possible to provide a void.

Further, the buffer elastic plate 8 can have a required out-of-plane contour shape on the condition that the elastic plate 8 can be reliably interposed at the abutting portions of both the mounting brackets 5 and 6. The outer contour shape can be, for example, a circle, an oval, an ellipse, a polygon, a sector, or the like.
And the thickness etc. of such a buffer elastic board 8 can be suitably selected in relation to the performance of a required buffer function.

FIG. 4 is a view showing an embodiment of the buffer elastic plate 8, FIG. 4 (a) is a plan view, and FIG. 4 (b) is a sectional view taken along the line bb in FIG. 4 (a). .
Here, the contour outside the plane of the shock absorbing elastic plate 8 is a circular, substantially elliptical shape having both sides opposite to the diametrical direction cut in a straight line, and fitted to the inner cylinder 7 a of the engine mount 7. Around the through-hole 8a, on the surface on one side that will face the mounting bracket 5 on the vehicle body side, a plurality of, in the figure, eight required cross-sectional shapes extending radially from the center O of the hole 8a For example, ribs 8b made of protrusions having a semi-cylindrical cross section are formed at equal intervals in the circumferential direction, and each of the ribs 8b functioning as a vibration transmission path to the inner cylinder 7a side of the engine mount 7 is provided. A thin-walled portion 8d that reduces the height of the rib 8b is provided at an adjacent portion on the radially outer side to the boss portion 8c around the through-hole 8a to reduce the height of the rib 8b, toward the inner cylinder 7a side. Of vibration transmitted through the rib 8b At the same time, the boss 8c around the through hole 8a of the shock absorbing elastic plate 8 that is fitted to the inner cylinder 7a by the through hole 8a and supported on the inner cylinder is separated from the peripheral surface of the inner cylinder 7a. The notch 9 located in the circumferential direction is continuously provided over an angular range of less than 180 ° in the circumferential direction, and this notch 9 blocks the vibration input to the buffer elastic plate 8 from being transmitted to the inner cylinder 7a. Make it work.

In this case, the elastic plate 8 is positioned and supported on the inner cylinder 7 a with a portion where the notch 9 is not formed.
In relation to this positioning support, it is preferable to provide another concave portion 10 that fits into the protrusion provided in the inner cylinder 7a and prevents the buffer elastic plate 8 from rotating in the portion 9c of the through hole 8a.
By the way, since this recessed part 10 contacts the protrusion peripheral surface of the inner cylinder 7a, it shall not be contained in the concept of the notch 9 for a vibration cutoff said by this invention.

In addition, in the place shown in FIG. 4, only one notch 9 is provided around the through hole 8, but a plurality of notches can be provided at intervals in the circumferential direction. One of the plurality of notches can also function as the recess 10.
Further, as shown in the figure, in addition to providing the notch 9, a thin portion 8d that reduces the height of the rib 8b is provided, but the thin portion 8d is not essential to the present invention. .

By the way, each of the illustrated ribs 8b can act to enhance the buffering function by being deformed flexibly when the mounting brackets 5 and 6 are brought into contact with each other.
As shown in the figure, all the ribs 8b are provided with thin portions 8d. However, when the transmission path of the vibration generated in the buffer elastic plate 8 to the inner cylinder 7a side can be clearly specified, It is also possible to provide the thin-walled portion 8d only on one rib 8b, or on two or three ribs 8b or only half of the ribs 8b.

Here, the rib 8b can be formed not only on the surface on one side of the elastic plate 8, but also on the surface on the other side. In this case as well, it is possible to provide the thin portion 8d in the same manner as described above. This is preferable for suppressing transmission of vibration to the cylinder 7a side.
The thin wall portion 8d is not necessarily provided adjacent to the boss portion 8c, and can be provided in the middle of the extension of the rib 8b.
Further, the thin-walled portion 8d may be partially or entirely overlapped at a plurality of locations in the extending direction of the rib 8b, in other words, at a plurality of locations in the radial direction with respect to the hole center O, or may be overlapped at all. It can also be provided.

  In the buffer elastic plate 8 configured in this way, for example, when the vehicle 2 is accelerated, the engine 2 is mounted on the outside of the engine side mounting bracket 6 as illustrated in FIG. The cylinder portion 6a and / or the outer cylinder 7b of the engine mount 7 is in contact with the buffer elastic plate 8 that is fitted on the inner cylinder 7a of the engine mount 7, and the rotation of the engine 2 is brought into contact with the buffer elastic plate 8. When vibration corresponding to the number is input, the vibration is transmitted to the inner cylinder 7a via the vibration of the rib 8b, firstly by the vibration blocking function by the notch 9, and secondly. Can be effectively suppressed by the action of the thin-walled portion 8d functioning as a vibration mitigating portion. Therefore, as in the prior art, due to the vibration transmitted to the inner cylinder 7a via the rib 8b or the like, Take Bracket 5, the vehicle body panel or the like is resonated, thus, by the resonance, it is possible to eliminate the risk of vehicle interior vibration, cabin noise, etc. are greatly increased effectively.

  4 replaces the ribs 8b shown in FIG. 4 with radially extending grooves, thereby partitioning the fan-shaped portions of the necessary thickness between the respective grooves, and the required fan-shaped portions. The same applies to the case where a shock-absorbing elastic plate having a thin-walled portion to reduce the thickness is used at a required location. The transmission of vibration to the inner cylinder 7a of the engine mount 7 is effectively suppressed by both the action of the notch and the thin portion.

6 (a) and 6 (b) are diagrams showing another embodiment of the buffer elastic plate, which is a central through hole of an elastic plate having a necessary thickness, for example, a rubber plate, having a circular planar contour shape. A single arcuate thin wall portion 8e that is endlessly continuous in the circumferential direction is provided around 8a, and a plurality of notches 11 that are spaced apart in the circumferential direction are provided in a boss portion 8c around the through hole 8a. is there.
In this case, as described above, one of the plurality of cutouts can function as the recess 10 for preventing rotation.
In the case shown in FIG. 6, the arc-shaped thin portion 8e can be formed in a plurality of two or more strips, and one or a plurality of strips on the surface opposite to the one shown in the figure. Or on both surfaces.

  In addition, the thin-walled portion 8e that extends in an arc shape can be extended in a bent form as shown in FIG. It can be demonstrated effectively.

DESCRIPTION OF SYMBOLS 1 Engine room 2 Engine 3 Car body 4 Mounting apparatus 5 Car body side mounting bracket 6 Engine side mounting bracket 6a Cylindrical part 7 Engine mount 7a Inner cylinder 7b Outer cylinder 7c Elastic member 8 Buffer elastic plate 8a Central through hole 8b Rib 8c Boss part 8d 8e Thin part 9, 11 Notch 10 Recess O Center of hole

Claims (6)

A shock absorbing elastic plate disposed on an inner cylinder of a bush type engine mount that is connected to each of the vehicle body and the engine, and cushions an impact shock between the vehicle body side mounting bracket and the engine side mounting bracket. ,
A shock-absorbing elastic plate in which a notch located at a distance from the peripheral surface of the inner cylinder is provided in the through-hole of the shock-absorbing elastic plate fitted to the inner cylinder by a through-hole and supported on the inner cylinder.   The shock absorbing elastic plate according to claim 1, wherein a plurality of notches are provided around the through hole so as to be spaced apart in the circumferential direction.   The shock-absorbing elastic plate according to claim 1, wherein one notch continuous around an angle range of less than 180 ° in the circumferential direction is provided around the through hole.   A through-hole is provided in the transmission path of the shock-absorbing elastic plate to the inner cylinder side of the engine mount for vibration generated in the elastic plate due to contact with at least one of the outer cylinder of the engine mount and the mounting bracket surrounding the outer cylinder. The shock-absorbing elastic plate according to any one of claims 1 to 3, wherein one or more thin-walled portions are provided around the periphery.   The shock-absorbing elastic plate has, on at least one surface, a plurality of ribs extending radially from the inner cylinder side or a plurality of fan-shaped portions defined by a plurality of grooves extending radially from the inner cylinder side. The shock absorbing elastic plate according to any one of claims 1 to 4, wherein a thin wall portion for reducing the protruding height or thickness is provided on one or more ribs or one or more fan-shaped portions.   The shock-absorbing elastic plate has a uniform thickness throughout, and is provided with one or more thin-walled portions positioned around the through-holes or endlessly continuous in the circumferential direction of the through-holes. The buffer elastic board in any one of 4.

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