JP2008185201A - Engine mount - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an engine amount reducing its weight and cost, and reducing a vertical spring constant to enhance vibration isolation performance. <P>SOLUTION: In this engine mount 10 having an upper mounting metal fitting 12 and a lower mounting metal fitting 14, and a pair of rubber legs 16 interposed between the upper and lower mounting metal fittings, a hole 64 is formed in the upper mounting metal fitting 12, an annular rib 66 is erectingly formed along the periphery of the hole 64, and the upper end part of the rubber leg 16 is embedded in a space on the insides of the hole 64 and annular rib 66 and vulcanization-bonded to the upper mounting metal fitting 12. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an engine mount that supports a vehicle engine in a vibration-proof manner on a vehicle body based on elastic deformation of a rubber leg made of a block-like rubber elastic body.

Conventionally, an upper mounting bracket and a lower mounting bracket that are spaced apart from each other in the vertical direction are interposed between them, and the upper end and the lower end are vulcanized to the upper mounting bracket and the lower mounting bracket, respectively. 2. Description of the Related Art An engine mount that has a pair of rubber legs made of an adhesive block-like rubber elastic body and supports the engine in a vibration-proof manner based on elastic deformation of the rubber legs is widely used.
Usually, in this engine mount, the upper mounting bracket and the lower mounting bracket are made of a plate-shaped iron press product.

By the way, in recent years, in this type of engine mount, there is an increasing demand for weight reduction and cost reduction. As one solution, it is conceivable to reduce the thickness of the engine mount or to make it aluminum.
However, in this case, there is a problem in strength in the mounting bracket, and when the mounting bracket is made of aluminum, the manufacturing becomes difficult depending on the shape, and the cost increases accordingly.

For example, in the engine mount 200 of the type shown in FIG. 9 that supports the engine in a suspended manner, the plate-like upper mounting bracket 202 to which the mounting bracket on the engine side is fastened is fixed to a block-like rubber elastic body. The portion between the pair of rubber legs 204 (the central portion on the left and right in the figure) is greatly bent downward, and is fastened and fixed to the bracket on the engine side by the fastening hole 206 at the bottom of the recessed bent portion 208. However, in the case of the upper mounting bracket 202 having the concave bent portion 208 that is deeply depressed downward in this way, if it is attempted to manufacture it with an aluminum material, the cost increases.
In FIG. 9, reference numeral 210 denotes a plate-like lower mounting bracket fixed to the vehicle body side, and is fixed to the vehicle body side by a fastening hole (not shown).

In recent years, some engine mounts have been required to improve vibration proof characteristics, in particular, to lower the spring constant in the vertical direction (lower springs) in combination with weight reduction and cost reduction.
Further, in the engine mount shown in FIG. 9, by reducing the mass of the upper mounting bracket 202 fastened and fixed to the bracket on the engine side, the natural frequency on the bracket side including the upper mounting bracket 202 is increased to the high frequency side. It is also required to shift or avoid resonance with other vibration systems to avoid or reduce generation of vibration noise.

Patent Document 1 below discloses an engine mount or the like in which a plurality of holes are provided in an outer member and a material such as rubber is filled therein to achieve a weight reduction effect.
However, the one disclosed in Patent Document 1 is different from the present invention because the spring constant of the rubber leg is not lowered.

JP 2003-42229 A

  The present invention provides an engine mount that can reduce the weight and cost, and can reduce the spring constant in the vertical direction and increase the vibration isolation performance, against the background of the circumstances as described above. It was made as a purpose.

  Thus, according to the first aspect of the present invention, the upper mounting bracket and the lower mounting bracket, which are arranged apart from each other in the vertical direction, are interposed between the upper mounting bracket and the lower mounting bracket, Has a pair of rubber legs made of a block-like rubber elastic body whose lower end is vulcanized and bonded to the lower mounting metal, and the engine is mounted on the vehicle body based on the elastic deformation of the rubber legs. In the engine mount for supporting vibration isolation, the inner portion of the upper mounting bracket is formed as a through-hole in the plate thickness direction, leaving a portion corresponding to the upper end portion and the outer peripheral portion of the rubber leg. An annular rib is provided in a rising shape along the periphery, and the outer peripheral portion of the upper end portion of the rubber leg is vulcanized and bonded to the lower surface of the outer peripheral side of the hole portion of the upper mounting bracket, and the upper end portion The inner part from the outer peripheral part to the inner space of the hole and the annular rib Crowded because, characterized in that are vulcanization bonded to the inner surfaces of these holes and the annular rib.

  According to a second aspect of the present invention, in the first aspect, the opening area of the hole is increased with respect to the cross-sectional area of the portion where the cross-sectional area of the rubber leg in the direction perpendicular to the central axis is minimum. And the edge of this hole part is located outside the outer edge of the site | part of this minimum cross-sectional area, It is characterized by the above-mentioned.

  According to a third aspect of the present invention, in the second aspect of the present invention, in the second aspect, the pair of rubber legs has an inclined shape that inclines toward each other as the pair of rubber legs progresses upward, and the rubber legs have a transverse section of the portion having the minimum cross-sectional area. The shape is rectangular, and the hole has a corresponding rectangular shape.

Effects and effects of the invention

  As described above, according to the present invention, the upper mounting bracket is provided with a through hole in the thickness direction, the annular rib is provided in a rising shape along the periphery of the hole, and the outer peripheral portion of the upper end of the rubber leg is provided. , Vulcanized and bonded to the lower surface of the outer peripheral side of the hole portion of the upper mounting bracket, and the inner portion of the outer peripheral portion is embedded in the inner space of the hole portion and the annular rib to be vulcanized and bonded to the inner surface of the hole portion and the annular rib. Thus, according to the present invention, it is possible to effectively reduce the weight while using an iron-pressed product as the upper mounting bracket, and to reduce the processing cost of the upper mounting bracket, and hence the engine mount. Cost can be increased.

  In addition, since the upper mounting bracket is provided with a hole so that the upper end of the rubber leg is embedded therein, the spring constant in the vertical direction in the engine mount can be effectively reduced. The anti-vibration performance of the engine mount can be improved.

  Furthermore, since the mass of the upper mounting bracket can be reduced, the natural frequency on the bracket (bracket for mounting on the engine side) side including the upper mounting bracket can be shifted to the high frequency side. It is also possible to avoid or reduce the generation of vibration noise by avoiding resonance (bracket resonance).

In the present invention, since the annular rib is provided in a rising shape along the hole, the strength reduction of the upper mounting bracket due to the hole formed in the upper mounting bracket is caused by the reinforcing effect of the annular rib as a reinforcing rib. Can be supplemented.
In addition, by vulcanizing and bonding the upper end of the rubber leg to the inner surface of the annular rib, it is possible to compensate for the decrease in the bonding area between the upper end of the rubber leg and the upper mounting bracket due to the formation of the hole in the upper mounting bracket. It is possible to ensure a desired adhesive strength.

  The second aspect of the present invention provides a cross-sectional area in which the opening area of the hole portion is large and the edge of the hole portion is minimum with respect to the cross-sectional area of the portion where the cross-sectional area of the rubber leg in the direction perpendicular to the central axis is minimum. According to the second aspect, the spring constant in the vertical direction of the rubber leg, that is, the engine mount can be further effectively reduced. it can.

  In the present invention, the pair of rubber legs are inclined so as to approach each other as they move upward, and the shape of the hole corresponds to the cross-sectional shape (rectangular shape) of the portion having the smallest cross-sectional area. It can be made the shape of a rectangle (Claim 3).

  In FIG. 1, reference numeral 10 denotes an engine mount according to the present embodiment, and includes an upper mounting bracket 12 and a lower mounting bracket 14 made of a press-formed product of a plate-shaped iron material, and an upper end portion interposed between them in the vertical direction. The lower end portion has a pair of rubber legs 16 made of a block-like rubber elastic body vulcanized and bonded to the upper mounting bracket 12 and the lower mounting bracket 14, respectively.

Reference numeral 18 denotes a metal bracket on the vehicle body side. The engine mount 10 is configured such that the lower mounting bracket 14 is fastened and fixed to the bracket 18 in the fastening hole 20 of the fixing portion 22 and is attached to the vehicle body side via the bracket 18. ing.
Here, the bracket 18 on the vehicle body side has a fixing portion 24 having a shape that falls downward, and is fastened and fixed to the vehicle body side in a fastening hole 26 of the fixing portion 24.

Reference numeral 28 denotes an engine side bracket made of metal and having a large mass, and has a fixing portion 30, and is fastened and fixed to the engine side in a fastening hole 32 of the fixing portion 30.
The engine-side bracket 28 has a bolt 34 protruding upward, and the bolt 34 is inserted upward through a fastening hole 36 (see FIG. 5) at the center of the upper mounting bracket 12 and protrudes upward. . The nut 34 is screwed into the upward projecting portion of the bolt 34 so that the upper mounting bracket 12 in the engine mount 10 is fastened and fixed to the bracket 28 on the engine side.

  That is, in this embodiment, the bracket 28 on the engine side is fastened and fixed to the upper mounting bracket 12 of the engine mount 10 so that the engine mount 10 of this embodiment supports the engine side in the suspended state. Of the form.

2 to 8 show a specific configuration of the engine mount 10.
In this embodiment, the engine mount 10 is assembled to the vehicle with the left-right direction of FIGS. 2, 3, 4 and 5 as the front-rear direction of the vehicle, and the direction perpendicular thereto as the left-right direction of the vehicle.
As shown in FIG. 5, the engine mount 10 includes a rubber stopper portion 38 made of a substantially square cylindrical rubber elastic body that is configured to fall downward.

  Correspondingly, the lower mounting bracket 14 having a flat plate shape as a whole is formed with a rectangular tube portion 40 that is bent downward at the center thereof, and the rectangular tube portion 40 is formed as a rubber stopper portion. 38 is embedded.

On the other hand, the bracket 28 on the engine side has a shaft portion 42 as shown in FIG. 5, and a portion on the upper end side of the shaft portion 42 is configured as a bolt 34.
The shaft portion 42 is provided with a stopper portion 44 below the bolt 34.

As shown in FIG. 4, the stopper portion 44 has a pair of contact portions 46 in the vehicle front-rear direction and a pair of contact portions 48 in the vehicle left-right direction. The rubber stopper 38 abuts in the left-right direction in the front-rear direction.
Here, the square cylindrical rubber stopper portion 38 is connected to and integrated with the pair of rubber legs 16 by the connecting portion 50.

As shown in FIG. 2, a pair of rubber stoppers 52 made of a rubber elastic body are provided on the upper surface of the lower mounting bracket 14 so as to protrude upward in a block shape.
These rubber stopper portions 52 perform a stopper action when bound, and are connected to and integrated with the rubber legs 16 by a connecting portion 50.

From the upper surface of the lower mounting bracket 14, the pair of rubber legs 16 are provided so as to rise upward.
Here, the pair of rubber legs 16 are provided in an inclined shape that inclines in a direction approaching each other as they progress upward, that is, in a direction that forms a substantially C shape in FIG.
Each lower end portion, specifically, the lower end surface is integrally vulcanized and bonded to the upper surface of the lower mounting bracket 14.

Further, the pair of rubber legs 16 has a rectangular shape in which the cross-sectional shape perpendicular to the central axis P in FIG. 5 is long in the left-right direction of the vehicle.
The inner surface of the portion near the root with respect to the lower mounting bracket 14 has a shape that is hollowed out toward the outside, and a concave portion 54 is formed in the inner surface near the root.

The rubber leg 16 has the smallest cross-sectional area in the cross section perpendicular to the central axis P at the formation part of the recess 54 (part indicated by Q in the figure).
The cross-sectional shape of the rubber leg 16 in the portion Q where the concave portion 54 is formed is also a rectangular shape that is long in the vehicle left-right direction.
In the present embodiment, the recess 54 is provided for the purpose of reducing the spring constant of the rubber leg 16 in the vertical direction.

  Both ends of the upper mounting bracket 12 in the vehicle front-rear direction (the left-right direction in FIGS. 2, 3, 4, and 5) are flat portions 56 that are flat in a substantially horizontal direction. And 56 is formed in a downwardly large (deep) concave shape. In FIG. 2, 58 represents the concave curved portion.

  The concave curved portion 58 includes a pair of left and right inclined portions 60 that are inclined downward in the drawing, and a bottom portion 62 that is flat in a substantially horizontal direction stepped down with respect to the flat portion 56. The fastening hole 36 is provided at the center.

  In the upper metal fitting 56, a portion corresponding to the upper end portions of the pair of rubber legs 16 is a hole 64 (see FIG. 5) penetrating in the thickness direction, and along the periphery of the hole 64, An annular rib 66 having a rising shape is integrally formed.

Here, the hole 64 and the annular rib 66 are formed to extend from the flat portion 56 of the upper mounting bracket 12 to the inclined portion 60 of the concave curved portion 58.
The hole 64 and the annular rib 66 have a rectangular shape (planar shape perpendicular to the central axis P) that is long in the vehicle left-right direction, corresponding to the cross-sectional shape of the rubber leg 16.

The upper end portion and the outer peripheral portion of each of the pair of rubber legs 16 are vulcanized and bonded to the lower surface on the outer peripheral side of the hole portion 64 of the upper mounting bracket 12, and the portion inside the outer peripheral portion is the hole portion 64 and the outer peripheral portion. It is buried in the inner space of the annular rib 66. The embedded portion is integrally vulcanized and bonded to the inner surface of the hole 64 and the annular rib 66.
In the present embodiment, the portion of the upper metal member 12 where the hole 64 is formed is the portion where the stress is least generated when the rubber leg 16 is pushed downward in the drawing and elastically deformed. Even in this case, the strength of the metal fitting does not decrease so much.

The bottom 62 of the upper mounting bracket 12 is a stopper 68 having a shape in which both ends in the left-right direction of the vehicle, that is, the vertical direction in FIG. 3 bulge outward in an arc shape. Then, the upper surface of the lower mounting bracket 14 abuts against a rubber stopper portion 52 provided in a protruding shape upward, and the abutting action performs a stopper action at the time of bouncing (see FIG. 7).
In addition, the stopper action at the time of rebound is performed by the stopper part 70 formed in the bracket 28 on the engine side coming in contact with the square cylindrical rubber stopper part 38 of FIG.

  In the present embodiment, the inner space of the hole 64 and the annular rib 66 has a larger opening area (opening area in the direction perpendicular to the central axis P) than the cross-sectional area of the cross section of the formation part Q of the recess 54 of the rubber leg 16. In addition, the inner peripheral edge of the hole 64 and the annular rib 66 is located outside the outer peripheral edge of the portion Q having the smallest cross-sectional area. As such, the shapes of the hole 64 and the annular rib 66 are determined.

In the present embodiment, a part of the inner portions of the pair of rubber legs 16 on the sides facing each other are extended in directions approaching each other. In FIG. 5, 72 represents the extension.
As shown in FIG. 8 (A) (FIG. 8 (A) shows the shape of the cross-sectional view taken along the line VIII-VIII of FIG. 5), the extension 72 has an inner peripheral end at the upper mounting bracket 12. It is positioned so as to be drawn radially outward from the central fastening hole 36 and is provided continuously around the fastening hole 36.
The extension 72 is vulcanized and bonded to the lower surface of the upper mounting bracket 12.

  According to the present embodiment as described above, it is possible to effectively reduce the weight while using a press-worked product of iron as the upper mounting bracket 12, and the processing cost of the upper mounting bracket 12, and consequently the engine mount 10. The cost can be reduced.

  Further, the upper mounting bracket 12 is provided with a hole 64 so that the upper end portion of the rubber leg 16 is embedded therein, and the rubber leg 16 can escape upwardly in the hole 64 so that the upper and lower portions of the engine mount 10 are The spring constant in the direction can be effectively reduced, and the vibration isolation performance of the engine mount 10 can be improved.

  Further, since the mass of the upper mounting bracket 12 can be reduced, the natural frequency of the bracket (the bracket for mounting on the engine side) including the upper mounting bracket 12 can be shifted to the high frequency side, and other vibrations can be achieved. Resonance with the system (bracket resonance) can be avoided, and generation of vibration noise can be avoided or reduced.

In this embodiment, since the annular rib 66 is provided in a rising shape along the hole 64, the strength of the metal fitting due to the formation of the hole 64 in the upper mounting metal 12 is reduced. This can be supplemented by the reinforcing effect.
Further, the upper end portion of the rubber leg 16 is vulcanized and bonded to the inner surface of the annular rib 66, thereby reducing the bonding area between the upper end portion of the rubber leg 16 and the upper mounting bracket 12 due to the formation of the hole 64 in the upper mounting bracket 12. Therefore, it is possible to secure desired adhesive strength.

  Further, in the present embodiment, the opening area of the hole portion 64 is made large with respect to the cross-sectional area of the portion Q where the cross-sectional area of the rubber leg 16 in the direction perpendicular to the central axis P is minimum, and the hole portion 64 has a large opening area. Since the inner edge is located outside the outer edge of the portion Q, the spring constant in the vertical direction of the rubber leg 16, that is, the engine mount 10, can be further effectively reduced.

  Although the embodiment of the present invention has been described in detail above, this is merely an example, and the present invention has various shapes such as forming a recess 74 on the upper end surface of the rubber leg 16 as shown in FIG. The leg can be configured in various forms without departing from the spirit of the leg.

It is a perspective view which shows the engine mount of one Embodiment of this invention in a bracket assembly | attachment state. It is a perspective view which shows the engine mount of the embodiment. It is a top view which shows the engine mount of the embodiment. It is a bottom view which shows the engine mount of the embodiment. FIG. 5 is a sectional view taken along line VV in FIG. 3. FIG. 6 is a sectional view taken along line VI-VI in FIG. 3. It is a side view which shows the engine mount of the embodiment. (A) It is VIII-VIII sectional view taken on the line of FIG. (B) It is the figure which showed the modification of the engine mount of this invention. It is a figure which shows an example of the conventional engine mount.

Explanation of symbols

10 engine mount 12 upper mounting bracket 14 lower mounting bracket 16 rubber leg 64 hole 66 annular rib

Claims (3)

The upper mounting bracket and the lower mounting bracket that are spaced apart from each other in a plate shape are interposed between the upper mounting bracket and the lower mounting bracket, the upper end is the upper mounting bracket, and the lower end is An engine mount that includes a pair of rubber legs made of block-like rubber elastic bodies that are vulcanized and bonded to the lower mounting bracket, and that supports the engine in a vibration-proof manner on the vehicle body based on elastic deformation of the rubber legs. The mounting bracket has a portion that corresponds to the upper end portion and the outer peripheral portion of the rubber leg, and the inner portion serves as a hole that penetrates in the plate thickness direction, and an annular rib is provided in a rising shape along the periphery of the hole. The outer peripheral portion of the upper end portion of the rubber leg is vulcanized and bonded to the lower surface on the outer peripheral side of the hole portion of the upper mounting bracket, and the inner portion of the upper end portion from the outer peripheral portion is the hole portion and the Embedded in the inner space of the annular rib, these holes and An engine mount characterized by being vulcanized and bonded to the inner surface of an annular rib.   In Claim 1, with respect to the cross-sectional area of the portion where the cross-sectional area of the rubber leg in the direction perpendicular to the central axis is minimum, the opening area of the hole is large and the edge of the hole is An engine mount, wherein the engine mount is located outside an outer edge of a portion having the smallest cross-sectional area.   3. The rubber leg according to claim 2, wherein the pair of rubber legs has an inclined shape that inclines toward each other as it advances upward, and the rubber legs have a rectangular cross-sectional shape at a portion of the minimum cross-sectional area. The engine mount is characterized in that the hole has a corresponding rectangular shape.

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