JP2007239816A - Cylindrical mount - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cylindrical mount wherein, when the cylindrical mount is attached to an attaching part of a bracket by press-fitting, stress of a rubbery elastic body does not become uneven and durability is always sufficient even when an axial rotation load is generated at the bracket supported by an outer cylindrical body. <P>SOLUTION: The cylindrical mount 1 consists of the outer cylindrical body 4 in a cylinder shape which is press-fit to an inner circumference of the attaching part 2 of the bracket, an inner cylindrical body 5 in a cylinder shape which is provided co-axially with the outer cylindrical body 4 and has an insertion part 54 of a fixing tool for fixing to a vehicle body of an automobile formed at its inner circumference surface 52 and the rubbery elastic body 6 provided between both the cylindrical bodies 4, 5. A round shape protruding part 53 or recessed part is formed at an outer circumference surface 51 of the inner cylindrical body 5 and a round shape recessed part 63 or protruding part corresponding to the protruding part 53 or the recessed part is formed at the inner circumference surface 61 of the rubbery elastic body 6 adhered to the outer circumference surface 51 of the inner cylindrical body 5. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a cylindrical mount used in the field of automotive vibration isolation technology.

  Conventionally, when a center bearing for supporting a propeller shaft of a passenger car is supported by a bracket with respect to the vehicle body, an outer cylinder supporting the bracket and a concentric arrangement with the outer cylinder are fixed to the vehicle body. A rubber-like elastic body is interposed between a cylindrical inner cylinder having an insertion portion for inserting a fixing jig that is fixed to the supporting metal fitting, and a high-frequency vibration is interposed therebetween. It is known to suppress (the following Patent Document 1).

  In this structure, as shown in FIG. 2, an outer cylinder 102 that supports the bracket 101 and an inner cylinder 103 in which an insertion portion for inserting a fixing jig that is fixed to the support metal fitting is formed on the inner periphery. An upper rubber elastic body 104 and a lower rubber elastic body 105 interposed between the outer cylinder 102 and the inner cylinder 103, and a washer for holding the lower rubber elastic body 105 from below. 106, the number of parts is as many as five, and it is necessary to sandwich the upper rubber-like elastic body 104 and the lower rubber-like elastic body 105 from both sides in the axial direction at the time of assembly, which is complicated. There was a defect with.

  In order to solve this problem, in Patent Document 2 below, as shown in FIG. 3, a cylindrical mount 114 in which a rubber-like elastic body 113 is bonded between an outer cylindrical body 111 and an inner cylindrical body 112 is provided. It is press-fitted to the inner periphery of the bracket mounting portion 115 to improve workability during assembly, and the parts are composed of the outer cylindrical body 111, the inner cylindrical body 112, and the rubber-like elastic body 113. However, it has been proposed to reduce the number of parts.

  However, with this configuration, the number of parts can be reduced to three and the assembly workability can be improved. However, the axial rotation load (on the bracket supported by the outer cylinder 111 ( When the load in the P direction shown in FIG. 3 occurs, there is a problem that the stress of the rubber-like elastic body 113 becomes non-uniform and the durability of the cylindrical mount 114 is insufficient.

Japanese Utility Model Publication No. 05-065640 Japanese Utility Model Publication No. 05-091950

  The present invention has been made in order to solve the above-described problems, and the object of the present invention is to press-fit and fit a cylindrical mount to a mounting portion of a bracket. Even when an axial rotational load (P-direction load shown in FIG. 3) is generated in the bracket supported by the above, the cylindrical mount does not have a non-uniform durability due to non-uniform stress of the rubber-like elastic body. Is to provide.

  In order to achieve the above object, a cylindrical mount according to a first aspect of the present invention includes a cylindrical outer cylinder that is press-fitted to the inner periphery of the bracket mounting portion, and a concentricity with the outer cylinder. A cylinder provided with a cylindrical inner cylinder in which an insertion portion of a fixing jig that is arranged and fixed to the vehicle body of an automobile is formed on an inner peripheral surface, and a rubber-like elastic body interposed between the two cylinders An R-shaped convex portion or concave portion is formed on the outer peripheral surface of the inner cylindrical body, and the convex portion is formed on the inner peripheral surface of the rubber-like elastic body that adheres to the outer peripheral surface of the inner cylindrical body. Alternatively, an R-shaped concave portion or convex portion corresponding to the concave portion is formed.

  The present invention has the following effects.

  That is, the cylindrical mount of the present invention having the above-described configuration is provided even when the cylindrical mount is attached by press-fitting the outer cylindrical body to the inner periphery of the bracket mounting portion. Since the R-shaped concave portion or convex portion corresponding to the R-shaped convex portion or concave portion formed on the outer peripheral surface is formed on the inner peripheral surface of the rubber-like elastic body, the bracket supported by the outer cylindrical body Even when an axial rotation load is generated, since the stress of the rubber-like elastic body becomes uniform, the durability of the cylindrical mount can be improved.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, exemplary embodiments of the invention will be described with reference to the drawings.

  FIG. 1 is a cross-sectional view of a main part of a cylindrical mount to which the present invention is applied. The cylindrical mount 1 includes an outer cylindrical body 4, an inner cylindrical body 5, and a rubber-like elastic body 6. Yes.

  The outer cylinder 4 is a cylindrical shape formed of a press-formed steel plate, and the outer diameter of the outer cylinder 4 is the mounting portion 2 so that the cylindrical mount 1 can be fixed by being press-fitted into the mounting portion 2 of the bracket. The inner diameter is slightly the same as or slightly larger.

  The inner cylinder 5 is a cylindrical shape formed of a press-formed steel plate, is disposed concentrically and inwardly with the outer cylinder 4, and has an R shape having a bulge in the outer diameter direction on the outer peripheral surface 51. Are formed on the inner peripheral surface 52, and a bolt insertion portion 54 for fixing the cylindrical mount 1 to the support fitting 3 fixed to the vehicle body of the automobile is formed.

  The rubber-like elastic body 6 is a cylindrical shape formed of natural rubber or synthetic rubber, and the outer peripheral surface 51 of the inner cylindrical body 5 is attached to the inner peripheral surface 61 to be bonded to the outer peripheral surface 51 of the inner cylindrical body 5. An R-shaped concave portion 63 corresponding to the R-shaped convex portion 53 is formed, and the outer peripheral surface 62 is bonded to the outer cylindrical body 4 and is interposed between both cylindrical bodies (4, 5). It is disguised.

  The cylindrical mount 1 configured as described above is press-fitted into the inner periphery of the bracket mounting portion 2 from the lower side in the axial direction (lower side in the drawing), and the outer cylindrical body 4 is fitted into the mounting portion 2. Thus, the cylindrical mount 1 is fixed to the mounting portion 2 of the bracket. Next, a bolt, which is a fixing jig, is inserted into the insertion portion 54 formed on the inner periphery of the cylindrical mount 1, and the inner cylinder 5 is fixed to the support fitting 3 fixed to the vehicle body. The bracket and the vehicle body are connected.

  In this case, even if an axial rotational load P is generated in the bracket supported by the cylindrical mount 1, the R-shaped recess 63 is formed on the inner peripheral surface 61 of the rubber-like elastic body 6. The stress generated in the cylindrical elastic body 6 becomes uniform, and the durability of the cylindrical mount 1 can be improved.

  In the present embodiment, a case has been described in which the convex portion 53 is formed on the outer peripheral surface 51 of the inner cylindrical body 5 and the concave portion 63 is formed on the inner peripheral surface 61 of the rubber-like elastic body 6 corresponding thereto. On the contrary, the concave portion may be formed on the outer peripheral surface 51 of the inner cylindrical body 5 and the convex portion may be formed on the inner peripheral surface 61 of the rubber-like elastic body 6 corresponding thereto.

Sectional drawing of the principal part of the cylindrical mount which concerns on this invention Explanatory drawing of the support structure of the bracket based on the prior art example 1 Explanatory drawing of the support structure of the bracket which concerns on the prior art example 2

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cylindrical mount 2 Attaching part 3 Support metal fitting 4 Outer cylinder 5 Inner cylinder 51, 62 Outer peripheral surface 52, 61 Inner peripheral surface 53 Convex part 54 Insertion part 6 Rubber-like elastic body 63 Concave part P Axial rotational load

Claims (1)

A cylindrical outer cylindrical body that is press-fitted into the inner periphery of the bracket mounting portion, and a fixing jig insertion portion that is arranged concentrically with the outer cylindrical body and is fixed to the vehicle body of the automobile are formed on the inner peripheral surface. A cylindrical mount comprising a cylindrical inner cylindrical body, and a rubber-like elastic body interposed between the two cylindrical bodies,
An R-shaped convex portion or concave portion is formed on the outer peripheral surface of the inner cylindrical body, and an R corresponding to the convex portion or concave portion is formed on the inner peripheral surface of the rubber-like elastic body that adheres to the outer peripheral surface of the inner cylindrical body. A cylindrical mount having a concave or convex shape.

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