JP2007225047A - Cylindrical mount - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cylindrical mount mounted by pres-fitting it into a mounting portion of a bracket, preventing the drop out of the bracket even when abnormal load exceeding supporting load is input to the bracket supported by an outward cylinder body. <P>SOLUTION: The cylindrical mount 1 comprises the cylindrical outward cylinder body 4 to be pressed and fitted into the inner periphery of the mounting portion 2 of the bracket, a cylindrical inward cylinder body 5 arranged concentrically with the outward cylinder body 4 and having an insertion-through portion 51 formed in the inner periphery for a fixture to be fixed therethrough to the body of an automobile, and a rubber elastic body 6 mounted between both cylinder bodies 4, 5. The outward cylinder body 4 has a stepped portion 41, and an outward lower-side cylinder portion 43 formed on the axial lower side of the stepped portion 41 with its outer diameter B larger than an inner diameter A of the mounting portion 2. <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 a vehicle body, an outer cylinder supporting the bracket and a concentric arrangement with the outer cylinder are fixed to a vehicle body. A cylindrical inner cylinder having an insertion part for inserting a fixing jig to be fixed to the supporting metal fitting, and a rubber-like elastic body interposed between both cylinders, It is known to suppress the vibration of the following (Patent Document 1 below).

  In this conventional structure, as shown in FIG. 2, the outer cylinder 102 that supports the bracket 101 and the inner cylinder in which an insertion portion for inserting a fixing jig that is fixed to the support metal fitting is formed on the inner periphery. The body 103, the upper rubber elastic body 104 and the lower rubber elastic body 105 interposed between the outer cylinder 102 and the inner cylinder 103, and the lower rubber elastic body 105 are held from below. The number of parts is as many as five, and it is necessary to sandwich the upper rubber elastic body 104 and the lower rubber elastic body 105 from both sides in the axial direction when assembling. There was a defect that it was.

  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, when an abnormal load greater than the support load is input to the bracket whose mounting portion 115 is supported by the outer cylindrical body 111, the bracket may fall off the cylindrical mount 114.

Japanese Utility Model Publication No. 5-65640 Japanese Utility Model Publication No. 5-91950

  The present invention has been made in order to solve the above-described problems, and the object of the present invention is to install a cylindrical mount by press-fitting into a mounting portion of a bracket. To provide a cylindrical mount in which a bracket is not dropped even when an abnormal load greater than the support load is input to the bracket supported by the body.

  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 cylindrical shape including a cylindrical inner cylindrical body in which an insertion portion of a fixing jig that is arranged and fixed to a vehicle body is formed on the inner periphery, and a rubber-like elastic body interposed between the two cylindrical bodies The mount is characterized in that a stepped portion is formed in the outer cylindrical body, and an outer diameter of the outer lower tubular portion axially lower than the stepped portion is made larger than an inner diameter of the mounting portion. To do.

  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 outer cylindrical body is attached by fitting the outer cylindrical body to the inner periphery of the bracket mounting portion. Since the outer diameter of the outer lower cylinder part is larger than the inner diameter of the bracket mounting part, when an abnormal load greater than the support load is input to the bracket supported by the outer cylinder, the outer lower cylinder part It functions as a stopper and can prevent the bracket from falling off.

  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 cylindrical body 4 is a cylindrical shape formed of a press-formed steel plate, has a stepped portion 41 at the center, and is axially above the stepped portion 41 on the inner periphery of the bracket mounting portion 2. A small-diameter outer upper cylindrical portion 42 that is press-fitted and a large-diameter outer lower cylindrical portion 43 that has an outer diameter B that is lower than the stepped portion 41 in the axial direction and larger than the inner diameter A of the mounting portion 2 of the bracket. It consists of and.

  The inner cylinder 5 is a cylindrical shape formed of a press-formed steel plate, and is disposed concentrically with the outer cylinder 4 inwardly, and is cylindrically attached to the support fitting 3 fixed to the vehicle body of the automobile. A bolt insertion portion 51 for fixing the shape mount 1 is formed on the inner periphery.

  The rubber-like elastic body 6 is a cylindrical shape formed of natural rubber or synthetic rubber, and the outer peripheral side surface 61 is vulcanized and bonded to the outer cylindrical body 4, and the inner peripheral side surface 62 is vulcanized to the inner cylindrical body 5. It is bonded and interposed between both cylinders (4, 5).

  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 figure), and is an outer portion that is a small-diameter portion in the outer cylindrical body 4. The cylindrical mount 1 is fixed to the mounting portion 2 of the bracket by fitting the upper cylindrical portion 42 to the mounting portion 2. Next, a bolt, which is a fixing jig, is inserted into the insertion portion 51 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, the cylindrical mount 1 has the small-diameter outer upper cylindrical portion 42 fitted to the bracket mounting portion 2 to support the bracket. Therefore, when an abnormal load greater than the support load is input to the bracket, The outer lower cylindrical portion 43 having an outer diameter B larger than the inner diameter A of the mounting portion 2 functions as a stopper, and it is possible to prevent the bracket from falling off.

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 41 Stepped part 42 Outer upper side cylinder part 43 Outer lower side cylinder part 5 Inner cylinder
51 Insertion part 6 Rubber elastic body A Mounting part inner diameter B Outer lower cylinder part outer diameter

Claims (1)

A cylindrical outer cylindrical body that is press-fitted into the inner periphery of the bracket mounting portion, and an insertion portion for a fixing jig that is arranged concentrically with the outer cylindrical body and is fixed to the vehicle body are formed on the inner periphery. A cylindrical mount comprising a cylindrical inner cylindrical body and a rubber-like elastic body interposed between the two cylindrical bodies,
A cylindrical mount, wherein a stepped portion is formed in the outer cylindrical body, and an outer diameter of an outer lower cylindrical portion axially lower than the stepped portion is made larger than an inner diameter of the mounting portion.

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