JP6820239B2 - Bracket for anti-vibration device - Google Patents

Description

The present invention relates to a bracket for an anti-vibration device.

As the vibration isolator used for the engine mount of a vehicle or the like, a vibration isolator main body connected to the engine on the vibration generating side is often fixed to the vehicle body on the vibration receiving side by a metal bracket.

In recent years, in order to reduce the weight and cost of the vibration isolator, a resin bracket made of a resin material has been used instead of the metal bracket. Since there is a problem in strength to fasten metal bolts to the resin bracket, insert a tubular metal fitting when molding the resin bracket, insert the bolt into this metal fitting, and insert the resin bracket and other parts. Has been concluded.

At this time, in order to ensure the fastening state between the resin bracket and other parts and prevent damage to the resin bracket, flange portions are formed at both ends of the metal fitting, and one flange portion has a non-round shape. Has been proposed (see, for example, Patent Document 1). In this way, when a load is input to the resin bracket from the fastener that attaches the vibration isolator body to the resin bracket via the insert bracket, the stress concentration on the resin bracket due to the load input by providing the flange portion on the insert bracket. Is relaxed.

Japanese Unexamined Patent Publication No. 10-82442

In this way, even if the resin bracket is provided with flanges on the insert metal fittings and both ends are fixed to the vehicle body, bending deformation occurs due to the load input from the vibration isolator body, and the insert metal fittings come into contact with the resin bracket. The area is reduced. As a result, there is a problem that the stress concentration on the resin bracket increases during bending deformation.

It is conceivable to increase the thickness of the resin bracket in order to increase the strength (cross-sectional coefficient) of the resin bracket, but this is contrary to the intention of adopting the resin bracket for weight reduction and cost reduction.

An object of the present invention is to provide a bracket used for a vibration isolator, which is a bracket for a vibration isolator in which stress concentration due to vibration input from the vibration isolator body is relaxed.

The bracket for a vibration isolator according to claim 1 of the present invention has a resin bracket body attached to either a vibration receiving portion or a vibration generating portion, and a first end portion and a second end portion. And the cylinder part through which the fastener is inserted so that the vibration receiving part or the other side of the vibration generating part is attached to the first end side of the bracket body via the vibration isolator body, and the cylinder. An insert metal fitting having a flange portion formed so as to extend radially outward to the second end portion side of the portion and a protruding portion formed to protrude from the flange portion to the first end portion side is provided. ..

The anti-vibration device bracket according to claim 1 has a fastener (fastener) in which a resin bracket body is attached to either a vibration receiving portion or a vibration generating portion and is inserted into an insert metal fitting including a tubular portion penetrating the bracket body. For example, the other of the vibration receiving portion or the vibration generating portion is attached to the first end side of the tubular portion of the bracket body by a bolt) via the vibration isolator main body. On the other hand, a flange portion extending radially outward from the tubular portion is formed on the second end portion side of the tubular portion, and a protruding portion is formed so as to project from the flange portion to the first end portion side.

Therefore, when vibration (load) is input to the bracket body from the vibration generating portion, even if a bending load is applied to the bracket body, the flange portion formed on the second end side of the insert metal fitting to the first end side. Since the protruding portion formed in the above is arranged inside the bracket body (insert molding), the protruding portion abuts on the bracket body and bending deformation of the bracket body is suppressed. Further, this suppresses a decrease in the contact area of the insert metal fitting with the bracket body when the bracket body is bent and deformed, and alleviates the stress concentration of the bracket body due to the bending deformation. That is, it is suppressed that stress is concentrated on the resin bracket body and becomes the starting point of fracture.

The anti-vibration device bracket according to claim 2 of the present invention is the anti-vibration device bracket according to claim 1, wherein the anti-vibration device bracket is formed so as to project from the protruding portion toward the tubular portion, and the bracket is formed in the axial direction of the tubular portion. A locking portion in which the bracket main body is interposed is provided between the bracket portion and the flange portion.

The anti-vibration device bracket according to claim 2 is provided with a locking portion that protrudes from the protruding portion to the tubular portion side, and the bracket main body is provided between the locking portion and the flange portion in the axial direction of the tubular portion. Is intervening.

Therefore, when vibration is input from the vibration isolator body to the bracket body and the bracket body is bent and deformed so that the second end side becomes convex, it is interposed between the locking portion and the flange portion in the axial direction of the cylinder portion. The locking portion is locked to the bracket body, and the protruding portion can be reliably prevented from coming off the bracket body. Therefore, it is possible to suppress the bending deformation of the bracket body and to prevent the contact area between the insert metal fitting and the bracket body from being reduced due to the protrusion and the locking portion coming into contact with the bracket body. As a result, the concentration of stress on the bracket body at the time of vibration input is alleviated.

The anti-vibration device bracket according to claim 3 of the present invention is the anti-vibration device bracket according to claim 1 or 2, wherein uneven portions are formed on at least a part of the surface of the protruding portion. ..

In the anti-vibration device bracket according to claim 3, uneven portions are formed on at least a part of the surface of the protruding portion.

Therefore, when vibration is input from the vibration isolator body to the bracket body and the bracket body is bent and deformed so that the second end side becomes convex, the surface of the protruding portion on which the uneven portion is formed faces the protruding portion. It is locked to the surface of the main body and can surely prevent the protrusion from coming off the bracket main body. Therefore, it is possible to suppress the bending deformation of the bracket body and to prevent the contact area between the insert metal fitting and the bracket body from being reduced due to the protrusion and the locking portion coming into contact with the bracket body. As a result, the concentration of stress on the bracket body at the time of vibration input is alleviated.

The anti-vibration device bracket according to claim 4 of the present invention is the anti-vibration device bracket according to claim 2, wherein the protruding portion causes the bracket body to bend due to vibration input from the vibration generating portion. It is formed so as to extend in a direction intersecting the mounting direction of the bracket body.

In the anti-vibration device bracket according to claim 4, since the protruding portion is formed so as to extend in a direction intersecting the mounting direction, it becomes easy to form a locking portion on the insert metal fitting.

The anti-vibration device bracket according to claim 5 of the present invention is the anti-vibration device bracket according to any one of claims 1 to 4, wherein the insert metal fitting is on the first end side of the tubular portion. Is provided with a retaining portion formed so as to extend radially outward from the tubular portion.

The anti-vibration device bracket according to claim 5 is provided with a retaining portion formed by extending radially outward from the tubular portion at the first end portion of the tubular portion of the insert metal fitting.

Therefore, when a load is input to the insert fitting in the direction from the first end to the second end, the retaining portion (the surface on the second end side) formed at the first end of the insert fitting becomes the bracket. It comes into contact with the main body and prevents the insert metal fitting from falling off from the bracket main body toward the second end. As a result, it is possible to suppress a decrease in the contact area between the bracket body and the insert metal fitting during bending deformation of the bracket body, and to alleviate stress concentration in the bracket body during bending deformation. That is, it is suppressed that stress is concentrated on the resin bracket body and becomes the starting point of fracture.

The anti-vibration device bracket of the present invention can alleviate stress concentration due to vibration input from the anti-vibration device main body.

It is a perspective view which looked at the bracket for the vibration isolation device which concerns on one Embodiment of this invention from below. It is a perspective view which looked at the bracket for the vibration isolation device which concerns on one Embodiment of this invention from above. It is a schematic diagram which includes the partial cross section of the bracket for the vibration isolation device which concerns on one Embodiment of this invention. It is a perspective view which shows the insert metal fitting which concerns on one Embodiment of this invention. It is a bottom view of the bracket for the vibration isolation device which concerns on one Embodiment of this invention. It is a partial cross-sectional view which shows the bending deformation state of the bracket for the vibration isolation device which concerns on one Embodiment of this invention. It is a vertical sectional view which shows the insert metal fitting which concerns on the variation of one Embodiment of this invention. It is a vertical sectional view which shows the insert metal fitting which concerns on the variation of one Embodiment of this invention. (A) and (B) are cross-sectional plan views of insert metal fittings according to variations of one embodiment of the present invention, respectively. It is sectional drawing which shows the insert metal fitting which concerns on the variation of one Embodiment of this invention.

[Embodiment]
The anti-vibration device bracket according to the embodiment of the present invention will be described with reference to the drawings.
In the present specification, the "vertical direction" is the direction in which the axial center of the tubular portion 18A (through hole 38A) of the insert metal fitting 14A described later extends, and the "planar view" is viewed from the vertical direction. To say that. In the figure, of the vertical directions, the upward direction is indicated by an arrow U and the downward direction is indicated by an arrow D.

The vibration isolator is used, for example, as an engine mount in a vehicle, and damps and absorbs vibration input from an engine, which is a vibration generating portion, to a vehicle body, which is a vibration receiving portion, and suppresses vibration transmission to the vehicle body.

The anti-vibration device bracket 10 (hereinafter, may be referred to as "bracket 10") according to the present embodiment is attached to the vehicle body side which is a vibration receiving portion, and also via the anti-vibration device main body (including a rubber elastic body). It is connected to the engine side, which is the vibration generating part. The vibration isolator main body is attached to the bracket 10 so that the input direction of the main vibration substantially coincides with the vertical direction.

As shown in FIGS. 1 and 2, the bracket 10 is provided with vehicle body mounting portions 70A and 70B for vehicle body mounting at both ends of a bracket body 12 formed of a resin material in a curved substantially plate shape. Since the vehicle body mounting portions 70A and 70B have the same configuration except that they are turned upside down, only the vehicle body mounting portion 70A will be described, and the description of the vehicle body mounting portion 70B will be omitted. The components of the vehicle body mounting portion 70B that are the same as those of the vehicle body mounting portion 70A are designated by adding B to the same reference reference numerals as those of the vehicle body mounting portion 70A, and the description thereof will be omitted.

Ribs 72A and 74A protruding from the upper and lower surfaces are formed on the vehicle body mounting portion 70A, respectively. Insert metal fittings 76A and 78A are arranged so as to penetrate the vehicle body mounting portion 70A from the rib 72A toward the rib 74A. By inserting fasteners (for example, bolts) into the insert fittings 76A and 78A, the bracket body 12 is fixed to the vehicle body.

Insert metal fittings 14A and 14B integrally molded with the bracket main body 12 are arranged between both ends of the bracket main body 12. Since the insert fittings 14A and 14B have the same configuration, only the insert fitting 14A will be described, and the description of the insert fitting 14B will be omitted. In the insert metal fitting 14B, the same components as the insert metal fitting 14A are designated by adding B to the same reference number as the reference code of the insert metal fitting 14A, and the description thereof will be omitted.

Further, FIG. 3 is a partial cross-sectional view schematically showing the bracket body 12 in a rectangular shape. In FIG. 3, the portion indicated by the white triangle is the vehicle body portion 16 to which the bracket main body 12 is attached.

As shown in FIG. 3, the insert metal fitting 14A is arranged so as to penetrate from the upper surface 12A to the lower surface 12B of the bracket main body 12. As shown in FIGS. 3 and 4, the insert metal fitting 14A has a cylindrical tubular portion 18A extending in the vertical direction. On the first end 19A (upper) side of the cylinder 18A to which the vibration isolator main body is attached, a diameter expansion portion 20A that expands in diameter outward from the cylinder 18A toward the first end 19A is formed. There is. On the second end 21A (lower) side opposite to the first end 19A of the cylinder 18A, a diameter expansion portion 22A that expands in diameter outward from the cylinder 18A toward the second end 21A is formed. Has been done.

In the insert metal fitting 14A, a flange portion 24A is formed on the second end portion 21A side (lower end side of the diameter expansion portion 22A) of the cylinder portion 18A. As shown in FIGS. 3 and 4, the flange portion 24A is formed so as to project outward from the second end portion 21A of the tubular portion 18A (diameter expansion portion 22A) in the mounting direction (direction away from the tubular portion 18A) in a plan view. It has a rectangular plate shape. Protruding portions 28A and 30A are formed so as to protrude from both ends of the flange portion 24A in the mounting direction on the first end portion 19A side (upward (arrow U direction)), respectively.

Here, as shown in FIG. 5, the "mounting direction" refers to the direction connecting the vehicle body mounting portion 70A and the vehicle body mounting portion 70B of the bracket body 12 in a plan view. Specifically, in a plan view, the midpoint C of the cylinders of the insert metal fittings 76A and 78A and the midpoint F of the cylinders D and E of the insert metal fittings 76B and 78B are connected. This is the direction (see FIG. 5, arrow X direction).

Further, the protruding portions 28A and 30A of the insert metal fitting 14A are formed with locking portions 32A and 34A at the upper ends protruding toward the tubular portion 18A (inside in the mounting direction), respectively.

As shown in FIG. 3, a cylindrical recess 36A formed inside the enlarged diameter portion 22A is formed on the lower side of the insert metal fitting 14A. Further, the enlarged diameter portion 20A, the tubular portion 18A, and the enlarged diameter portion 22A of the insert metal fitting 14A are formed with through holes 38A that penetrate the insert metal fitting 14A in the vertical direction and communicate with the recess 36A.

Further, as a result of the metal insert metal fitting 14A being insert-molded into the resin bracket body 12, the portion where the bracket body 12 comes into contact with the insert metal fitting 14A is referred to as follows.

That is, the portions where the enlarged diameter portion 20A, the tubular portion 18A, and the enlarged diameter portion 22A of the insert metal fitting 14A come into contact with each other are referred to as an inclined surface 40A, a cylindrical surface 42A, and an inclined surface 44A of the bracket body 12. Further, the upper surface of the flange portion 24A of the insert metal fitting 14A and the portions where the protruding portions 28A and 30A abut are referred to as the lower surface 46A and the groove portions 48A and 50A, respectively. Further, in the groove portions 48A and 50A, the portions into which the locking portions 32A and 34A protruding inside the protruding portions 28A and 30A in the mounting direction are inserted are referred to as recesses 52A and 54A, respectively.

In the locking portions 32A and 34A, the protrusions 56A and 58A of the bracket body 12 are located between the locking portions 32A and 34A and the flange portions 24A, respectively.

By inserting a fastener (for example, a bolt) into the through hole 38A of the insert metal fitting 14A formed in this way and fastening the fastener (for example, a bolt), the vibration isolator main body including the rubber elastic body is fixed to the upper surface 12A of the bracket main body 12. Ru.

The operation of the anti-vibration device bracket 10 configured in this way will be described.
When vibration is input from the engine side, the vibration input from the engine side is damped and absorbed by the rubber elastic body of the vibration isolator body, and the vibration is suppressed from being transmitted to the vehicle body side via the bracket body 12. ..

At this time, a load acts on the bracket main body 12 from the vibration isolator main body side through the bolt inserted into the through hole 38A of the insert metal fitting 14A and the insert metal fitting 14A.

This load acts on the bracket body 12 in the vertical direction. Therefore, the bracket main body 12 supported by the vehicle body portions 16 and 16 at both ends in the mounting direction is bent and deformed by the vertical vibration input from the vibration isolator main body.

Since the bending deformation is substantially the same on both the left and right sides of the bracket body 12 with the insert metal fitting 14A sandwiched in the mounting direction, only the right half will be described and the left half will be omitted.

As shown in FIG. 6, when a downward load is input to the bracket body 12 by vibration input, the bracket body 12 bends and deforms so as to be convex downward in the mounting direction. As a result, the cylindrical surface 42A, the inclined surface 44A, and the lower surface 46A of the bracket body 12 are separated from the upper surfaces of the tubular portion 18A, the diameter-expanded portion 22A, and the flange portion 24A of the insert fitting 14A, and the insert fitting 14A comes into contact with the bracket body 12. The area is reduced. As a result, the stress concentration on the bracket body 12 increases.

However, when the bracket main body 12 is bent and deformed, the protruding portion 30A formed so as to protrude from the outer end portion of the flange portions 24A of the insert metal fittings 14A and 14B toward the first end portion 19A is brought into contact with the groove portion 50A of the bracket main body 12. Therefore, bending deformation of the bracket body 12 is suppressed.

In particular, on the upper end side of the protruding portion 30A, a locking portion 34A is formed so as to protrude on the tubular portion 18A side (inside in the mounting direction), and this is further recessed toward the tubular portion 18A side in the groove portion 50A. It is in contact with the recess 54A. Therefore, even if the protruding portion 30A is about to come out of the groove 50A due to bending deformation of the bracket body 12, the locking portion is locked by the protruding portion 58A of the bracket body 12 located between the locking portion 34A and the flange portion 24A in the vertical direction. The 34A is locked, and the protrusion 30A is surely prevented from falling off from the groove 50A to the lower side (second end 21A side).

As a result, the bending deformation of the bracket body 12 due to the vibration input is suppressed, and the protrusion 30A and the locking portion 34A are in contact with the groove 50A and the recess 54A of the bracket body 12 when the bracket body 12 is bent and deformed. .. Therefore, it is possible to suppress stress concentration due to a decrease in the contact area with respect to the insert metal fitting 14A when the bracket body 12 is bent and deformed. That is, it is possible to suppress bending deformation of the bracket body 12 and alleviate stress concentration on the bracket body 12 without increasing the plate thickness of the resin bracket body 12.

Further, since the protruding portions 28A and 30A of the insert fitting 14A are formed so as to extend in the direction orthogonal to the mounting direction (FIG. 5, arrow Y direction) in a plan view, the tubular portion is formed from the upper ends of the protruding portions 28A and 30A. It becomes easy to form the locking portions 32A and 34A so as to project toward 18A (inside in the mounting direction).

Further, in the present embodiment, a downward load (vibration) is applied to the insert fitting 14A by providing the first end 19A of the insert fitting 14A with a diameter-expanded portion 20A whose diameter is enlarged outward in the radial direction from the cylinder portion 18A. When input is made, the enlarged diameter portion 20A (lower side surface) of the insert metal fitting 14A comes into contact with the inclined surface 40A of the bracket body 12 to prevent the insert metal fitting 14A from falling off to the lower side of the bracket body 12. That is, a cylindrical surface 42A in which the first end 19A of the tubular portion 18A of the insert metal fitting 14A is provided with a diameter-expanded portion 20A whose diameter is expanded radially outward from the tubular portion 18A, and the tubular portion 18A is arranged on the bracket body 12. By providing an inclined surface 40A having a larger diameter than the above, the enlarged diameter portion 20A functions as a retaining portion, whereby the insert metal fitting 14A does not fall down from the bracket main body 12 at the time of vibration input. Can be prevented.

In the present embodiment, the bracket main body 12 is attached to the vehicle body portion 16 which is a vibration receiving portion at both ends in the mounting direction, and the vibration isolator main body which is the vibration generating portion side by the fastener is attached via the insert metal fitting 14A. It is attached to the bracket body 12, but the opposite is also possible. That is, the bracket main body 12 may be attached to the vehicle body side which is the vibration receiving portion by the fastener via the insert metal fitting 14A, and may be attached to the vibration isolator main body on the vibration generating portion side at both ends of the bracket main body 12.

Further, in the present embodiment, by providing the locking portions 32A and 34A protruding toward the tubular portion 18A at the tip portions of the protruding portions 28A and 30A of the insert metal fitting 14A, the protruding portions 28A and 30A can be removed from the bracket body 12. It acted as a stop, but is not limited to this.

For example, as shown in FIG. 7, locking portions 32A and 34A projecting toward the opposite side (outside in the mounting direction) from the tubular portion 18A are provided at the tip portions of the protruding portions 28A and 30A of the insert metal fitting 14A, and the bracket main body 12 It may act as a stopper for the protruding portions 28A and 30A.

Alternatively, as shown in FIG. 8, by providing the uneven portions 60A and 62A on at least a part of the surface of the protruding portions 28A and 30A of the insert metal fitting 14A, the protruding portions 28A and 30A act as a stopper for the bracket main body 12. You may. The uneven portions 60A and 62A may be applied to those in which the protruding portions 28A and 30A have locking portions 32A and 34A.

Further, in the present embodiment, the protruding portions 28A and 30A of the insert fitting 14A are formed linearly in a direction orthogonal to the mounting direction in a plan view, but the present invention is not limited to this.

For example, as shown in FIG. 9 (A), the protruding portions 28A and 30A may be curved outward in the mounting direction, or as shown in FIG. 9 (B), the protruding portions 28A and 30A are inside in the mounting direction. The shape may be convexly curved.

Further, as shown in FIG. 10, the protruding portion 28A may be formed in an annular shape in a plan view. That is, a circular flange portion 24A extending radially outward from the lower end of the enlarged diameter portion 22A, and an annular protruding portion 28A extending upward from the radial outer end (outer peripheral end) of the flange portion 24A. It may be provided with a locking portion 32A formed so as to project radially inward from the upper end of the protruding portion 28A.

As described above, since the protruding portions 28A and 30A are formed so as to extend in the direction intersecting the mounting direction in a plan view, it becomes easy to form the locking portion that is formed so as to protrude inward in the mounting direction.

10 ... Bracket for anti-vibration device, 12 ... Bracket body, 18A ... Cylinder part, 19A ... First end part, 20A ... Diameter expansion part (retaining part), 21A ... Second end part, 24A ... Flange part, 28A, 30A ... protruding part, 32A, 34A ... locking part

Claims (5)

A resin bracket body that is attached to either the vibration receiving part or the vibration generating part,
It has a first end portion and a second end portion and penetrates the bracket main body, and the other of the vibration receiving portion or the vibration generating portion is placed on the first end portion side of the bracket main body via the vibration isolator main body. A tubular portion through which a fastener is inserted for attachment, a flange portion formed by extending radially outward toward the second end portion side of the tubular portion, and a protrusion from the flange portion toward the first end portion side. An insert fitting having a formed protrusion, and
Bracket for anti-vibration device. The bracket for a vibration isolator according to claim 1, further comprising a locking portion formed so as to project from the protruding portion toward the tubular portion and the bracket main body is interposed between the protruding portion and the flange portion in the axial direction of the tubular portion. .. The anti-vibration device bracket according to claim 1 or 2, wherein an uneven portion is formed on at least a part of the surface of the protruding portion. The bracket for a vibration isolator according to claim 2, wherein the protruding portion is formed so as to extend in a direction intersecting the mounting direction of the bracket body, which causes the bracket body to bend due to vibration input from the vibration generating part. .. The anti-vibration according to any one of claims 1 to 4, wherein the insert metal fitting is provided with a retaining portion formed on the first end side of the tubular portion so as to extend radially outward from the tubular portion. Bracket for equipment.