JP5140020B2 - Mass member mounting structure - Google Patents

Description

  The present invention relates to a mass member attachment structure for attaching a mass member to an insertion member having a cylindrical portion into which a rubber bush is inserted.

  2. Description of the Related Art Conventionally, in an engine mount provided with an insertion member having a cylindrical portion into which a rubber bush is inserted, it is known to attach a mass member to the insertion member in order to suppress resonance of the vehicle body side member (for example, (See Patent Documents 1 and 2).

  FIG. 5 is a perspective view showing an example of a conventional engine mount. In the example shown in this figure, a fitting member 102 having a cylindrical portion 120 into which a rubber bush 101 is press-fitted and fixed is connected to a vehicle body side member (not shown) by brackets 121 and 121 attached to the outer periphery thereof. On the other hand, the rubber bush 101 is connected to an engine (not shown).

  The mass member 103 includes a plurality of plate-like members 130, 130,..., And these plate-like members 130, 130,. The welded plate-like members 130, 130,... Are attached to the outer peripheral surface of the insertion member 102 by being welded to the outer peripheral surface of the cylindrical portion 120 of the insertion member 102. As described above, the mass member 103 is configured by the plate-like members 130, 130,... Is useful when the mass production number of the engine mount a is small. Further, the plate-like members 130, 130,... Are welded together in order to prevent them from coming into contact with each other and generating abnormal noise.

In the above-described conventional device, the mass member 103 has an irregular shape, which is to prevent interference with peripheral components (not shown) around the engine mount a.
JP 2008-95821 A Japanese Patent Laid-Open No. 8-233030

  However, in the above-described conventional one, in addition to welding the mass member 103 to the fitting member 102, it is necessary to weld the plate-like members 130, 130,. The number of man-hours for attaching the mass member 103 to the insertion member 102 has increased.

  The present invention has been made in view of such a point, and an object thereof is to insert a mass member in a mass member mounting structure in which a mass member is attached to an insertion member having a cylindrical portion into which a rubber bush is inserted. It is to reduce the man-hours for attaching to the member.

  1st invention is the attachment structure of the mass member which attaches a mass member to the insertion member which has a cylinder part in which a rubber bush is inserted, Comprising: The said mass member is formed by processing one plate-shaped member. It has a corrugated portion formed in a corrugated shape in the cylindrical circumferential direction, and is attached to the outer peripheral surface of the cylindrical portion so as to extend in the cylindrical circumferential direction.

  Thus, since the mass member is formed by processing one plate-like member, the mass member is compared with the conventional case where a plurality of plate-like members constituting the mass member are welded together. The man-hour for attaching a member to an insertion member can be reduced.

  According to a second aspect of the present invention, in the first aspect, the corrugated portion has an outer crest and an inner trough that are alternately formed in the circumferential direction of the cylinder, A gap is opened between at least one of the cylindrical portions and the outer peripheral surface of the cylindrical portion.

  As a result, a gap is formed between at least one of the trough portions of the corrugated portion of the mass member and the outer peripheral surface of the tubular portion of the fitting member, so that the trough portion and the tubular portion are in contact with each other and noise is generated. Can be suppressed.

  According to a third invention, in the first or second invention, the mass member further includes an arcuate portion that is disposed to face the peripheral component and that extends along the outer peripheral surface of the cylindrical portion. It is characterized by being.

  Thereby, the arc-shaped portion of the mass member is disposed so as to face the peripheral component and extends along the outer peripheral surface of the cylindrical portion of the fitting member, so that the corrugated portion is disposed to face the peripheral component. Compared with, it is possible to prevent the mass member from interfering with peripheral components.

  According to a fourth aspect of the present invention, in any one of the first to third aspects, the mass member is welded to the outer peripheral surface of the cylindrical portion at both ends in the cylindrical circumferential direction, whereby the outer periphery of the cylindrical portion is It is characterized by being attached to a surface.

  Thereby, since the mass member is attached to the outer peripheral surface of the cylinder portion by welding both ends of the cylinder circumferential direction to the outer peripheral surface of the cylinder portion of the insertion member, in order to attach the mass member to the insertion member There are only two welding points, and the number of mounting steps can be reduced.

  According to a fifth invention, in any one of the first to third inventions, the mass member extends over substantially the entire circumference in the cylinder circumferential direction, and both ends in the cylinder circumferential direction are coupled to each other. Is attached to the outer peripheral surface of the cylindrical portion.

  Thereby, the mass member extends over substantially the entire circumference in the cylinder circumferential direction, and is attached to the outer circumferential surface of the cylinder portion of the fitting member by joining both ends in the cylinder circumferential direction. Only one welding point is required for attaching the mass member to the insertion member, or no welding is required to attach the mass member to the insertion member, and the number of attachment steps can be reduced.

  According to the present invention, since the mass member is formed by processing one plate-like member, it is compared with the case where a plurality of plate-like members constituting the mass member are welded together as in the prior art. Thus, the number of steps for attaching the mass member to the fitting member can be reduced.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(Embodiment 1)
In this embodiment, a rubber bushing as a vibration isolator is applied to an engine mount A of an automobile, and the engine mount A is interposed between an automobile power plant and a vehicle body (not shown) to load the power plant. In addition to supporting, the vibration from the power plant is absorbed or attenuated to suppress the transmission of vibration to the vehicle body.

  That is, as shown in FIG. 1, the rubber bush 1 includes a hollow cylindrical metal inner cylinder 10 and a hollow cylindrical metal provided coaxially with the inner cylinder 10 on the outer periphery of the inner cylinder 10. An outer cylinder 11 and a rubber elastic body 12 provided between the cylinders 10 and 11 and connecting the cylinders 10 and 11 to each other are provided. And the fitting metal fitting 2 (insertion member) which has the hollow cylindrical cylindrical part 20 by which the rubber bush 1 was press-fitted and fixed inside is attached to the outer periphery so that it may extend to a cylinder radial direction outer side, for example. The inner cylinder 10 is connected to a body frame (not shown) on the vibration receiving side by a metal bracket (not shown), while the inner cylindrical body 10 is a bracket (not shown) whose both ends in the cylinder axis direction are coupled by bolts or the like. To the power plant on the vibration source side.

  The engine mount A, for example, suspends a transmission-side end of a power plant mounted horizontally in an engine room, and is arranged so that the axis of the inner cylinder 10 is generally directed in the front-rear direction of the vehicle body. ing. The inner cylindrical body 10 is longer in the cylinder axial direction than the outer cylindrical body 11, and both ends in the cylindrical axial direction protrude from the outer cylindrical body 11. In the figure, reference numerals 13 and 14 denote rubber stoppers for restricting the relative displacement of the cylinders 10 and 11 in the cylinder axis direction.

  The fitting 2 is formed by bending the end of one side in the cylinder axis direction (the front side in FIG. 1 (a)) of the cylinder part 20 90 degrees inward in the cylinder radial direction in addition to the cylinder part 20. The first flange portion 21 and the second flange portion 22 formed by bending the end portion of the cylinder portion 20 on the other side in the cylinder axis direction (the back side in FIG. 1A) 90 degrees outward in the cylinder radial direction. doing. Thus, since the 1st flange part 21 is protruded inside cylinder diameter direction, the rubber bush 1 inserted in the fitting 2 can be received and hold | maintained by the 1st flange part 21. FIG.

  A mass member (dead weight) 3 is attached and fixed to the fitting 2 to suppress resonance of the body frame. Hereinafter, the mounting structure of the mass member 3 will be described. The mass member 3 is attached to the fitting 2 so as not to interfere with other members in a later step of the step of attaching the engine mount A to the vehicle body. Further, no load is directly input to the mass member 3 from the outside.

  The mass member 3 is formed by bending a single plate-like member, and has a corrugated portion 30 formed in a corrugated shape in the cylinder circumferential direction. In other words, the corrugated portion 30 is folded in a bellows shape in the cylinder circumferential direction. The corrugated portion 30 includes ridges 31 arranged on the outer side in the cylinder radial direction and valleys 32 arranged on the inner side in the cylinder radial direction, which are alternately formed in the cylinder circumferential direction. Both end portions in the cylinder circumferential direction of the mass member 3 are constituted by valley portions 32, respectively. The shape and size of the corrugated portion 30 (for example, the length in the circumferential direction of the corrugated portion 30 and the height in the radial direction of the corrugated portion 30 and the pitch of the crests 31 and the troughs 32) 3 is set based on the required weight. Thus, by providing the corrugated portion 30 in the mass member 3, the weight design of the mass member 3 can be widened.

  The mass member 3 is welded to the outer circumferential surface of the cylindrical portion 20 of the fitting 2 by welding both ends in the circumferential direction of the cylindrical member 3 (that is, trough portions 32 and 32 at both ends). It is attached so as to extend in the cylinder circumferential direction on one side in the left-right direction (right side in FIG. 1B). W in the figure indicates a welded portion (not shown in FIG. 1A). Thus, since the welding location for attaching the mass member 3 to the fitting 2 is sufficient, as compared with the conventional case where a plurality of plate-like members constituting the mass member are welded, The number of mounting steps can be reduced. Moreover, since the welding length becomes short by having two welding locations as described above, it is possible to reduce costs and prevent the fitting 2 from being distorted.

  The mass member 3 is disposed closer to the first flange portion 21 side of the outer peripheral surface of the tubular portion 20 in order to prevent interference with the second flange portion 22 of the tubular portion 20. Further, gaps are opened between the other valleys 32, 32,... Other than the valleys 32, 32 at both ends and the outer peripheral surface of the cylindrical part 20. By providing such a gap, it is possible to prevent the valley portion 32 and the cylindrical portion 20 from coming into contact with each other and generating abnormal noise.

(Embodiment 2)
In the present embodiment, as shown in FIG. 2, the mass member 3 is wound on the outer peripheral surface of the cylindrical portion 20 so as to extend over substantially the entire circumference in the cylindrical circumferential direction. Hereinafter, differences from the first embodiment will be described.

  The mass member 3 includes first and second corrugated portions 30a and 30b that face each other obliquely in the vertical direction (upper right (or lower left) direction in FIG. 2B), and the following peripheral components of the corrugated portions 30a and 30b. The arcuate part 33 curved so as to connect the end parts on the P side, and the cylindrical part 20 from the end part on the opposite side to the arcuate part 33 (peripheral part P) in the first corrugated part 30a. A first coupling portion 34 that is curved so as to extend to the opposite side of the first corrugated portion 30a along the outer peripheral surface of the first corrugated portion, and a tube from the end opposite to the arc-shaped portion 33 in the second corrugated portion 30b. It has the 2nd coupling | bond part 35 curvedly formed so that it might extend on the opposite side to the 2nd waveform part 30b along the outer peripheral surface of the part 20. As shown in FIG.

  The arc-shaped portion 33 is disposed to face a peripheral component P (only FIG. 2B is shown) around the engine mount A (rubber bush 1), and extends along the outer peripheral surface of the cylindrical portion 20. Is formed. That is, the arc-shaped portion 33 is in close contact with the outer peripheral surface of the cylindrical portion 20. By forming the arc-shaped portion 33 in this way, it is possible to prevent the mass member 3 from interfering with the peripheral component P as compared with the case where the corrugated portion 30 is arranged to face the peripheral component P. it can.

  The end of the first coupling portion 34 opposite to the first corrugated portion 30a and the end of the second coupling portion 35 opposite to the second corrugated portion 30b are close to each other (or contact opposite). Yes.

  The mass member 3 has a cylindrical portion formed by joining both ends in the cylindrical circumferential direction (that is, ends opposite to the corrugated portions 30a and 30b in the first and second coupling portions 34 and 35) by welding. It is attached to 20 outer peripheral surfaces. Thus, since only one place for welding is required for attaching the mass member 3 to the fitting 2, the number of attachment steps can be reduced. Moreover, since it is not necessary to weld the mass member 3 to the fitting 2, it is possible to prevent the fitting 2 from being distorted.

  In the present embodiment, the arrangement positions and the number of the corrugated portions 30 and the arc-shaped portions 33 are set as described above. Of course, depending on the arrangement positions and the number of peripheral components P, etc. The arrangement position and the number of the waveform portions 30 and the arc-shaped portions 33 may be changed.

(Embodiment 3)
As shown in FIG. 3, in this embodiment, the mass member 3 is wound on the outer peripheral surface of the cylindrical portion 20 so as to extend over substantially the entire circumference in the cylindrical circumferential direction, as in the second embodiment. The means for attaching the member 3 to the fitting 2 is different from that of the second embodiment. Hereinafter, differences from the second embodiment will be described.

  In addition to the first and second corrugated portions 30a and 30b, the arc-shaped portion 33, and the first and second coupling portions 34 and 35, the mass member 3 includes the first corrugated portion 30a and the first corrugated portion 30a. Is a substantially rectangular first fastening portion 34a formed by bending the opposite end portion about 90 degrees outward in the cylinder radial direction, and the opposite end portion of the second coupling portion 35 from the second corrugated portion 30b. It further has a substantially rectangular second fastening portion 35a formed by bending about 90 degrees outward in the cylinder radial direction. These fastening portions 34a and 35a are close to each other (or are in contact with each other). The first and second fastening portions 34a and 35a are formed with fastening insertion holes (not shown) at positions corresponding to each other.

  The mass member 3 is connected by fitting the first and second fastening portions 34a and 35a by fastening with bolts 36 and nuts 37 (that is, fasteners) inserted through the fastening insertion holes. Is attached to the outer peripheral surface of the cylindrical portion 20. Thus, although one fastening portion is required to attach the mass member 3 to the fitting 2, it is not necessary to weld for the attachment, so that the number of attachment steps can be reduced. This attachment method is useful when the fitting 2 and the mass member 3 are non-weldable (for example, cast or aluminum die cast).

  In the present embodiment, the mass member 3 is connected to the outer peripheral surface of the cylindrical portion 20 of the fitting 2 by connecting the first and second fastening portions 34a and 35a by fastening with bolts 36 and nuts 37. For example, as shown in FIG. 4, the first and second fastening portions 34 a and 35 a are coupled to each other by fastening with a rivet 38 (that is, a fastener). You may attach to the outer peripheral surface of the part 20. FIG.

(Other embodiments)
In each of the above-described embodiments, the rubber bush 1 is applied to the engine mount A. However, the present invention is not limited to this. May be.

  Furthermore, in each said embodiment, although the clearance gap is provided between trough parts 32, 32, ... other than trough parts 32, 32 of both ends, and the outer peripheral surface of the cylinder part 20, respectively, trough parts 32, It is only necessary to provide a gap between at least one of 32,... And the outer peripheral surface of the cylindrical portion 20. However, from the viewpoint of preventing the generation of abnormal noise, it is desirable that the number of valley portions 32 that provide a gap with the cylindrical portion 20 is large.

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

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

  As described above, in the mass member mounting structure according to the present invention, the present invention can be applied to applications that require reducing the number of steps for mounting the mass member to the fitting member.

It is a figure which shows the engine mount which concerns on Embodiment 1 of this invention, (a) is a perspective view, (b) is a front view. It is a figure which shows the engine mount which concerns on Embodiment 2, (a) is a perspective view, (b) is a front view, (c) is a side view. It is a figure which shows the engine mount which concerns on Embodiment 3, (a) is a perspective view, (b) is a front view. It is a perspective view of the modification of the engine mount which concerns on Embodiment 3. FIG. It is a perspective view of the conventional engine mount.

A Engine mount P Peripheral parts 1 Rubber bushing 2 Insertion fitting (insertion member)
20 cylindrical part 3 mass member 30 corrugated part 30a first corrugated part 30b second corrugated part 31 peak 32 trough 33 arcuate part

Claims (5)

A mass member mounting structure for attaching a mass member to an insertion member having a cylindrical portion into which a rubber bush is inserted,
The mass member is formed by processing one plate-like member, has a corrugated portion formed in a corrugated shape in the cylindrical circumferential direction, and extends in the cylindrical circumferential direction on the outer peripheral surface of the cylindrical portion. The mass member mounting structure is characterized by being mounted as described above. In the mass member mounting structure according to claim 1,
The corrugated portion is formed alternately in the cylinder circumferential direction, and has a crest on the outside in the cylinder radial direction and a trough on the inside,
A mass member mounting structure, wherein a gap is opened between at least one of the troughs and the outer peripheral surface of the cylindrical part. In the mass member mounting structure according to claim 1 or 2,
The mass member mounting structure further includes an arc-shaped portion that is disposed so as to face the peripheral component and extends along the outer peripheral surface of the cylindrical portion. In the mass member mounting structure according to any one of claims 1 to 3,
The mass member mounting structure, wherein the mass member is attached to the outer peripheral surface of the cylindrical portion by welding both ends in the cylindrical circumferential direction to the outer peripheral surface of the cylindrical portion. In the mass member mounting structure according to any one of claims 1 to 3,
The mass member extends over substantially the entire circumference in the cylinder circumferential direction, and is attached to the outer circumferential surface of the cylinder portion by joining both ends in the cylinder circumferential direction. Member mounting structure.

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