JP5478113B2 - Suspended engine mount - Google Patents

Description

  The present invention relates to an improvement of a liquid seal type suspension engine mount, and in particular, a spring constant due to vibration input that causes a resonance sound or the like in a direction orthogonal to the axial direction of the inner metal fitting and the outer cylinder metal fitting. We propose a technology that can prevent the increase in the amount easily and as expected.

  Conventional techniques for preventing an increase in spring constant against high-frequency radiation vibration in a direction orthogonal to the central axis of this type of engine mount are described in Patent Documents 1 to 3, respectively.

  In both cases, the inner metal fitting connected to the engine side and the lower end portion of the outer cylindrical metal fitting arranged around the inner metal fitting and connected to the vehicle body side have an outer contour side shape of a truncated cone, a pyramid. It is liquid-tightly connected with a hollow rubber elastic body having a frustum shape such as a base, and the upper end of the outer cylinder fitting is liquid-tightly sealed with a diaphragm, and inside the outer cylinder fitting, the diaphragm and the inner fitting And the rubber elastic body or the like as a liquid chamber filled with an incompressible liquid, and the liquid chamber is divided into a main liquid chamber located on the rubber elastic body side by a partition member, and a diaphragm side When the two liquid chambers are communicated by a restricting passage made of a rigid material, a wing-like barrier plate or constricted protrusion that is separate from the rubber elastic body is used as the main liquid chamber. It is stored and arranged in the liquid chamber.

  In such an engine mount, for example, a narrowing protrusion or the like is positioned in a liquid flow path formed of an annular region of the main liquid chamber with respect to vibration input that causes a resonance sound or the like in a direction orthogonal to the axis. As a result of the narrowing of the liquid flow path cross-sectional area, the resonance frequency of the liquid flowing in the annular region is shifted to a low frequency range so as not to cause a problem in vibration isolation performance, for example, It is supposed that significant high dynamic springs can be reduced or avoided in the frequency range in question such as acceleration noise.

  Further, in such a mount, in addition to the narrowing protrusions being formed of a rubber elastic body, the inner and outer peripheral surfaces of the narrowing protrusions constitute a rubber elastic body and an outer cylinder fitting that constitute the wall inner surface of the main liquid chamber. Since the constriction protrusion can be easily elastically deformed from any of the above, when the liquid flow occurs in the annular region forming the circumferential liquid flow path in the main liquid chamber, the constriction protrusion is It is assumed that the fluid flow is easily disturbed by elastic deformation by the action of the fluid pressure, and that a significant increase in the dynamic spring constant due to the resonance action of the liquid is more advantageously suppressed.

  Furthermore, by configuring the constriction protrusions etc. separately from the rubber elastic body, adverse effects on the original vibration-proof characteristics of the mount due to the rubber elastic body are avoided as much as possible, and at the time of manufacturing the mount Assume that the assembly workability of each part is maintained well.

JP-A-4-302727 JP 2003-17297 A JP 2004-169750 A

  By the way, in the inventions described in these patent documents, since the wing-like barrier plate or the narrowing protrusion which is separate from the rubber elastic body is accommodated in the main liquid chamber, the narrowing protrusion or the like is removed from the main liquid. On the assembly work efficiency and the assembly accuracy, it is difficult to make all mounts always exhibit a certain performance, while the work man-hours required to accurately position and arrange in a predetermined position in the room increase. There was a problem.

  An object of the present invention is to solve such problems of the prior art, and the object of the present invention is a factor such as resonance noise in a direction orthogonal to the axial direction of the inner and outer metal fittings. It is an object of the present invention to provide a suspended engine mount that can effectively prevent an increase in the dynamic spring constant with respect to the vibration input, and can sufficiently improve both the mounting work efficiency and the mounting accuracy of the mount.

The suspension type engine mount of the present invention includes an inner fitting connected to the engine side, and a lower end portion of an outer cylindrical fitting connected to the vehicle body side, which is arranged around the inner fitting and aligned in the axial direction. The outer profile of the side forms a truncated cone shape such as a truncated cone and a truncated pyramid, and is connected in a liquid-tight manner by a rubber elastic body having a lining layer on the inner surface of the outer cylinder fitting, and the upper end of the outer cylinder fitting is a diaphragm. The liquid chamber is a rigid material mainly composed of a liquid enclosed in a space between the diaphragm and the rubber elastic body, especially the rubber elastic body inside the outer tube fitting. The partition member is divided into a main liquid chamber on the rubber elastic body side and a sub liquid chamber on the diaphragm side, and the two liquid chambers are communicated with each other through a restriction passage, and in the main liquid chamber, The lining of rubber elastic body The inner peripheral surface of a portion, or both the around the inner peripheral surface and the frustum-shaped body portion of the lining layer portion, and projects radially with respect to the central axis of the inner fitting, extending in the central axis line direction A plurality of wing-like rubber ridges arranged at equal intervals in the circumferential direction, for example, in four directions, six directions, or eight directions, and protruding from the lining layer portion of the rubber elastic body In the lower end portion of the ridge, a slot is provided between the protruding tip of the rubber ridge and the frustum-shaped portion of the rubber elastic body .

Therefore, the protruding form of the blade rubber projections in this case, the lining layer portion of the rubber elastic body, form projecting toward the body portion side of the rubber elastic body, your and, lining layer portion and a body portion There will be two forms that protrude from both sides.

Such engine mounts smell Te, between at the lower end portion of the blade rubber ridges projecting from the lining layer portion of the rubber elastic body, and the protruding tip of the rubber projection, the frustum-shaped body portion of the rubber elastic body the more and this interposing the slot, axial relative displacement between the inner fitting and the outer tubular member and to the time in the direction of the relative displacement perpendicular to the axis, a stress concentration on the projecting distal end portion of the blade rubber ridges To prevent and improve the durability of the winged rubber ridge.
Na us, it is more effective to form the bottom of the slot in a curved shape.

  In the liquid seal type engine mount of the present invention, the winged rubber ridge is described above for vibration input that is a factor such as resonance noise in the direction orthogonal to the axial direction of the inner metal fitting and the outer cylinder metal fitting. It functions in the same way as the constricted protrusion and wing-shaped barrier plate, effectively preventing an increase in the dynamic spring constant by changing the resonance frequency of the sealed liquid in the annular region of the main liquid chamber, etc. The quietness can be ensured.

  By the way, in this mount, the rubber ridge is provided on at least one of the lining layer portion and the frustum-shaped main body portion of the rubber elastic body so that the rubber ridge is used for mounting the mount. As a result, the mounting and mounting efficiency of the mount can be greatly improved, and the mounting accuracy can be increased. Thus, it is possible to effectively eliminate the possibility of variations in the vibration proof performance.

In addition, when a wing-like rubber ridge is projected on the lining layer portion of the rubber elastic body with such a mount, the protruding end of the rubber ridge and the frustum of the rubber elastic body are formed at the lower end portion of the rubber ridge. When the mount is relatively displaced in the axial direction of the inner metal fitting and the outer cylindrical metal fitting and in the direction perpendicular to the axial direction by interposing the slot between the shape main body portion, the protruding tip of the rubber ridge It is possible to relax the concentration of stress on the wings and to increase the durability of the winged rubber ridge.
This is more effective when the bottom of the slot is curved to make it difficult for stress to concentrate.

It is the top view and longitudinal cross-sectional view which show embodiment of this invention. It is the top view and longitudinal cross-sectional view which show the formation aspect of a feather-like rubber protrusion. It is a graph which shows the reduction effect of a dynamic spring constant. It is a longitudinal section which shows the modification of Drawing 2 (b).

  In the engine mount shown in FIG. 1, reference numeral 1 denotes an inner metal fitting connected to the engine side via a bracket, which will be described later, and 2 is arranged around the inner metal fitting 1 so as to be aligned in the axial direction. Also shown are outer cylinder fittings connected to the vehicle body via brackets described later.

  Here, the inner metal fitting 1 is formed by fixing or fixing a cylindrical metal fitting 4 on the lower side of the cup-shaped member 3 in the figure, and the outer cylindrical metal fitting 2 surrounding the inner metal fitting 1 is stored in a partition member described later. And a tapered lower end portion 6 that gradually decreases in diameter toward the bottom.

In addition, here, the inner metal fitting 1 and the lower end portion of the outer metal fitting 2 have a frustum shape such as a truncated cone shape or a truncated pyramid shape, and the upper end edge of the outer cylinder fitting 2 is reached. The rubber elastic body 7 having the inner surface lining layer up to is liquid-tightly connected.
As shown in the figure, the rubber elastic body 7 is connected to the rubber elastic body 7 while the rubber elastic body 7 completely embeds the cup-shaped member 3 having a plurality of holes, and is vulcanized and bonded to the inner surface of the outer cylindrical fitting 2. It will be done by fixing by others.
The rubber elastic body 7 shown in the figure has a straight portion 9 that continuously surrounds the cylindrical metal fitting 4 in the lower bottom region of the frustum-shaped main body portion 8 having a trapezoidal longitudinal cross-sectional shape.

  Then, the upper end opening of the outer cylinder fitting 2 is liquid-tightly sealed with a diaphragm 10 having a curved shape that protrudes upward in the figure, and the inner surface lining layer 11 is more precisely located inside the outer cylinder fitting 2. A liquid chamber 12 is formed by sealing a non-compressible required liquid such as silicol oil or alkylene glycol in a space sandwiched between the diaphragm 10 and the rubber elastic body 7 inside the liquid chamber 12. 12 is divided into a main liquid chamber 14 located on the rubber elastic body 7 side and a sub liquid chamber 15 located on the diaphragm 10 side by a partition member 13 positioned and fixed to the large-diameter upper end portion 5 of the outer cylinder fitting 2. To do.

  By the way, the partition member 13 here has a restriction passage 16 that can be made of a rigid material, one end of which opens into the main liquid chamber 14 and the other end of which opens into the sub liquid chamber 15. , 2 has a membrane 17 that absorbs fluctuations in the liquid chamber pressure with deformation or displacement and suppresses an increase in the dynamic spring constant with respect to vibration input of 100 to 300 Hz in the axial direction.

Further, in this engine mount, as can be seen from FIG. 2 in which the diaphragm 10 and the partition member 13 are omitted, the inner metal fitting is provided in the lining layer 11 portion of the rubber elastic body 7 in the main liquid chamber 14. The wing-like rubber ridges 18 projecting in the radial direction with respect to the central axis of one and extending in the direction of the central axial line are arranged at intervals of a predetermined interval in the circumferential direction, with an angular interval of 90 ° in the figure. Arrange one sheet.
Of course, the number of the wing-like rubber ridges 18 can be appropriately increased or decreased as required.

  Here, the wing-like rubber ridges can be provided so as to protrude from the frustum-shaped main body portion 8 of the rubber elastic body 7 toward the lining layer 11 instead of the above-described portions, and the center of the inner metal fitting 1 can be provided. Around the axis, the lining layer 11 and the main body portion 8 are alternately protruded from the lining layer 11 and the main body portion 8 at intervals in the circumferential direction. It is also possible to set up.

  In any of these cases, the wing-like rubber ridge is formed in the annular region in the main liquid chamber 14 in the same manner as described above with respect to the vibration input in the direction orthogonal to the axis of the inner and outer fittings 1 and 2. Functioning to prevent the occurrence of liquid resonance in the interior, an effective reduction of the dynamic spring constant can be realized.

  By the way, such an engine mount, for example, as shown in FIG. 1, fastens and fixes the mounting bracket 22 for the engine to the cylindrical fitting 4 of the inner fitting 1 with bolts 21, and By providing the mounting bracket 23, it can be applied as a suspended engine mount.

3 (a) and 3 (b), respectively, the suspension type engine mount as described above is applied to a 2400CC gasoline engine, and the inner metal fitting 1 is arranged in the left-right direction and the front-rear direction of the vehicle perpendicular to the central axis. A graph showing the effect of reducing the dynamic spring constant when oscillating at ± 5 G in each direction in comparison with the example product provided with the winged rubber ridge and the conventional product without the winged rubber ridge. It is.
In addition, the dimensions of the winged rubber ridge of the example product are 2.5 mm in thickness, 7.0 mm in protrusion amount, 32 mm in maximum extension length, and other dimensions of the example product are as follows. The inner diameter of the upper end portion of the outer cylinder fitting is 96.0 mm, the inner diameter of the intermediate straight portion of the outer fitting is 83.8 mm, and the thickness of the lining layer of the rubber elastic body is 1.5 mm.
The conventional product has the same configuration as that of the example product except that the feathered rubber protrusion does not exist.

  According to the graphs of FIGS. 3 (a) and 3 (b), the peak value of the dynamic spring constant of the conventional product with respect to the vibration input that is present between 200 and 300 Hz and causes the resonance sound, etc. It can be seen that the product can effectively reduce both the left-right vibration and the front-back vibration.

  Here, in the case where the liquid chamber space is expanded or contracted according to the input vibration frequency, the engine mount can be adapted to an arbitrary frequency.

FIG. 4 is a longitudinal sectional view corresponding to FIG. 2B, showing another embodiment.
This is a lower end portion of a wing-like rubber ridge 18 projecting from the lining layer 11 of the rubber elastic body 7, a protruding tip of the rubber ridge 18, and a truncated cone-shaped main body portion 8 of the rubber elastic body 7. By providing the slot 19 therebetween, the boundary region between the rubber protrusion 18 and the frustum-shaped main body portion 8 in the relative vibration in the axial direction of the inner and outer metal fittings 1 and 2 and in the direction perpendicular to the axial line. The concentration of stress is prevented, and the durability of the winged rubber ridge 18 is enhanced.
In this case, stress concentration can be more effectively prevented by making the bottom portion of the slot 19 have a curved shape as shown in the figure.

DESCRIPTION OF SYMBOLS 1 Inner metal fitting 2 Outer cylinder metal fitting 3 Cup-shaped member 4 Cylindrical metal fitting 5 Large diameter upper end part 6 Tapered lower end part 7 Rubber elastic body 8 Main-body part 9 Meat stealing part 10 Diaphragm 11 Lining layer 12 Liquid chamber 13 Partition member 14 Main liquid Chamber 15 Secondary liquid chamber 16 Restricted passage 17 Membrane 18 Wing rubber ridge 19 Slot

Claims (1)

The inner contour connected to the engine side and the lower end portion of the outer cylindrical bracket that is arranged around the inner bracket and aligned in the axial direction, and the outer contour side surface form a frustum shape. In addition, the rubber elastic body having a lining layer on the inner surface of the outer cylinder fitting is connected in a liquid-tight manner, and the upper end of the outer cylinder fitting is liquid-tightly sealed with a diaphragm. A liquid chamber formed by enclosing a liquid in a space sandwiched between elastic bodies is divided into a main liquid chamber on the rubber elastic body side and a sub liquid chamber on the diaphragm side by a partition member, and both of these liquid chambers are separated. A suspended engine mount that is communicated by a restricted passage,
The main liquid chamber, the rubber elastic body, with both the surrounding of the inner peripheral surface of the lining layer portion, or the inner peripheral surface of the lining layer portion and said frustum-shaped portion, the radiation with respect to the central axis of the inner fitting Projecting in the direction and extending in the central axis direction, a plurality of feathered rubber ridges are arranged at intervals in the circumferential direction ,
A hanging type in which a slot is provided between the protruding tip of the rubber protrusion and the frustum-shaped portion of the rubber elastic body at the lower end portion of the wing-shaped rubber protrusion protruding from the lining layer portion of the rubber elastic body Engine mount.

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