JPH0669469U - Engine support structure - Google Patents

Abstract

(57) [Abstract] [Purpose] To reduce the weight of an engine mount, which is one of the components of a vehicle body, and to prevent the outer cylinder from falling off or coming off due to the creep of the material used for weight reduction. [Structure] Cylindrical mount 10 forming an engine mount
Includes a rubber bush 12 having an inner cylinder 12A and an outer cylinder 12C having a rubber portion 12B loaded therein, and a rubber bush holding member 14 into which the rubber bush 12 is press-fitted.
At least one of these members is formed of a material that is elastically deformable and moldable, and an engaging portion 16 that prevents the rubber bush 12 from moving in the press-fitting direction is provided on the opposing surface of the rubber bush 12 and the rubber bush holding member 14. I have it.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an engine support structure, and more particularly, to a structure of a tubular mount.

[0002]

[Prior art]

 As is well known, an engine compartment of an automobile is provided with an engine mount for supporting the engine and the transmission and for preventing vibration from the engine from being transmitted to the vehicle body.

One of engine mounts is, for example, a cylindrical mount used in an FF vehicle. This tubular mount includes an inner cylinder and a rubber bush formed by vulcanizing and adhering a rubber portion to the inner peripheral surface of the outer cylinder, and the rubber bush is press-fitted into the bracket to be assembled. Such a tubular mount is attached to the vehicle body side via a bracket.

[0004]

[Problems to be solved by the device]

 By the way, in the engine support structure using such a cylindrical mount, the rubber bush is pre-compressed before the outer cylinder of the rubber bush is press-fitted into the bracket. This is a treatment for improving the durability strength of the rubber portion vulcanized and bonded to the outer cylinder, and specifically, it is compressed by a predetermined amount from the dimension during vulcanization. For this reason, the dimensions of the outer cylinder are set to include the inner diameter for loading the rubber bush and the press-fitting and compression margins of the bracket. The outer cylinder is formed of a metal pipe having relatively high strength against deformation during press fitting.

By the way, in recent years, there has been an increasing demand for weight reduction of vehicle body component parts, and a tubular mount is no exception. For this reason, various studies are currently being conducted.

Therefore, an object of the present invention is to provide an engine support structure capable of reducing the weight of a tubular mount, which is one of the objects of weight reduction of vehicle body component parts, without increasing the manufacturing cost. To do.

Another object of the present invention is to reduce the weight of a vehicle body component. Depending on the characteristics of the material selected for weight reduction, the rubber bush may come off or come off at the support portion of the rubber bush. An object is to provide an engine support structure having a structure capable of preventing accidents.

[0008]

[Means for Solving the Problems]

 In order to achieve this object, the invention according to claim 1 is an engine support structure including a tubular mount for supporting the weight on the engine side and for damping vibrations from the engine, wherein the tubular mount is , A rubber bush having an inner cylinder and an outer cylinder to which a rubber portion is vulcanized and bonded, and an opening into which the rubber bush is press-fitted, and a connecting portion with the vehicle body side. And an engaging portion that prevents the rubber bush from moving in the axial direction is formed on a surface of the opening of the rubber bush holding member facing the outer cylinder of the rubber bush. I am trying.

Further, in the engine support structure according to the first aspect of the present invention, at least one of the rubber bush and the rubber bush holding member is made of an elastically deformable resin material.

Further, in the engine support structure according to claim 1, the engaging portion is formed along the press-fitting direction of the rubber bush on a surface facing the outer surface of the rubber bush and the opening of the rubber bush holding member. It is characterized in that it is composed of uneven parts.

[0011]

[Action]

 According to the present invention, at least one of the rubber bush and the rubber bush holding member in the tubular mount is formed of a material that is elastically deformable and moldable. In particular, by using a resin as such a material, the weight of the component can be reduced by a simple method of resin molding without requiring a special structure.

Further, according to the present invention, an engaging portion composed of an uneven portion is formed along the press-fitting direction of the rubber bush at the facing portion of the rubber bush holding member and the outer cylindrical portion of the rubber bush press-fitted into the rubber bush holding member. Has been formed. Therefore, even if the phenomenon that it becomes impossible to maintain the press-fitting holding relationship between the rubber bush and the rubber bush holding member due to the characteristics of the material selected for the weight reduction, the rubber portion is caused by the engaging portion. The bush is prevented from coming off or coming off.

[0013]

【Example】

 1 to 4, the details of the embodiment of the present invention will be described.

FIG. 1 is a front view showing a main part of a cylindrical mount used in an engine support structure according to the present invention.

The tubular mount 10 includes a rubber bush 12 and a rubber bush holding member 14.

The rubber bush 12 is composed of a rubber portion 12B obtained by vulcanizing and adhering the inner cylinder 12A, and an outer cylinder portion 12C in which the rubber portion 12B is integrated.

The rubber bush holding member 14 is a bracket for mounting the tubular mount 10 on the vehicle body side, and is formed with an opening 14A and a vertical bottom surface continuous with the upper half of the opening 14A. There is. The opening portion 14A is for press-fitting the rubber bush 12, and a bottom surface bottom portion for connecting to the vehicle body side has a connecting portion 14C with the vehicle body side.

At least one of the rubber bush 12 and the rubber bush holding member 14 is made of a resin material that is elastically deformable.

In this embodiment, both the outer cylinder portion 12C of the rubber bush 12 and the rubber bush holding member 14 are made of a material that is elastically deformable and moldable. As a material in this case, a cylindrical mount is used. In consideration of the environment in which it is used, a polyamide-based glass fiber reinforced plastic having heat resistance and chemical resistance is used. The above-mentioned polyamide-based reinforced plastics include, for example, reinforced plastics such as nylon MXD6 having a glass fiber content of 30 to 50%.

The rubber bush holding member 14, which is resin-molded with such a material, has a structure of a connecting portion 14C with the vehicle body side provided on the bottom of the vertically lower surface, and is configured by inserting a metallic nut. ing. Aluminum is used as the metal in this case in order to reduce the weight.

By the way, in this embodiment, since the rubber bush 12 and the rubber bush holding member 14 are both formed of resin, the press-fitting holding relationship between the rubber bush 12 and the rubber bush holding member 14 depends on the characteristics of the material. A structure is provided to prevent the above from being lost.

That is, the cylindrical mount 10 is placed in a high temperature atmosphere in the engine room. Therefore, a creep phenomenon occurs in the rubber bush 12 and the rubber bush holding member 14 which are resin-molded. Accordingly, the compression stress is relaxed in the rubber bush 12 due to the press fit, and the tensile stress is relaxed in the rubber bush holding member 14 due to the press fit in the opening 14A. If the adhesive force is reduced between the outer peripheral surface of the rubber bush 12 and the inner peripheral surface of the opening 14A due to the relaxation of the stress between the two, the rubber bush 12 will come out of the opening 14A. It may become easier or come off.

Therefore, in this embodiment, the engaging portion 16 is provided at the facing portion between the rubber bush 12 and the rubber bush holding member 14.

That is, as shown in FIG. 2, the engaging portion 16 has a concave and convex shape that forms a relative shape between the outer peripheral surface of the outer cylindrical portion 12 C of the rubber bush 12 and the inner peripheral surface of the opening 14 A of the rubber bush holding member 14. It is composed of parts. As the shape of the uneven portion, as shown in FIG. 2, a corrugated shape or an undercut shape such as a tooth shape is selected so that they can mesh with each other. The engaging portion 16 is formed entirely or partially along the press-fitting direction of the rubber bush 12. Further, regarding the uneven size of the engaging portion 16, even if creep occurs on the rubber bush 12 side and the rubber bush holding member 14, the size of the rubber bush 12 is not moved in the press-fitting direction. ing. Regarding this size, it is necessary that the minimum outer cylinder portion 12C be such that it can be inserted within the elastic deformation capable of restoring the original shape.

Since the present embodiment has the above-described configuration, the rubber bush 12 is press-fitted into the opening 14 A of the rubber bush holding member 14 to form the cylindrical mount 10.

FIG. 3 shows a state in which the rubber bush 12 is press-fitted into the rubber bush holding member 14, where (A) is before press-fitting, (B) is when press-fitting, and (C) is press-fitting. Each of the latter states. Further, among the reference numerals in the drawings, D without a suffix indicates the diameter of the convex portion of the engaging portion on the rubber bush 12 side, and L without a suffix indicates the diameter of the engaging portion on the rubber bush holding member 14 side. The diameter of the recess is shown.

As is clear from FIG. 3, the rubber bush 12 press-fitted into the rubber bush holding member 14 is pressed against the convex portion and the concave portion of the engaging portion 16 by its own elastic force. The contraction deformation and the deformation in the restoring direction are repeated. A similar phenomenon occurs on the rubber bush holding member 14 side, and after the press-fitting is completely performed, as shown in (C), the rubber bush 12 is housed within the outer diameter in consideration of the pre-compression allowance. .

Further, FIG. 4 shows the strain with respect to the load on the rubber bush 12 and the rubber bush holding member 14 in this case. In FIG. 4, load P1 is at the time of press-fitting, P2 is after being press-fitted, reference numeral X indicates the rubber bush 12 side, and reference numeral Y indicates the rubber bush holding member 14 side. Shown respectively. In FIG. 4, at the time corresponding to FIG. 3 (B), the rubber bush 12 side is largely compressed and deformed by the load applied at the time of press fitting, but at the time corresponding to FIG. 3 (C), the pre-compression force is changed. It is constrained by compressive deformation to obtain a corresponding load.

On the other hand, if the rubber bush 12 and the rubber bush holding body 14 creep after the cylindrical mount 10 assembled in this way is assembled on the vehicle body side, the inner circumference of the opening 14A The adhesion between the surface and the outer peripheral surface of the rubber bush 12 is reduced. As a result, the holding force with respect to the rubber bush holding member 14 is reduced. However, since the engaging portion 16 is provided between the outer peripheral surface of the rubber bush 12 and the inner peripheral surface of the opening 14A, the engagement thereof is concerned. The meshing at the joint portion 16 prevents the outer cylinder portion 12 from moving.

In the present embodiment, the example in which the outer cylinder on the rubber bush side and the rubber bush holding member are both formed of resin has been described. However, if at least one of them is elastically deformable resin, For example, the outer cylinder on the rubber bush side, which does not adversely affect the weight saving of the above-mentioned tubular mount and which uses a relatively small amount of material, may be made of an elastic metal material.

[0031]

[Effect of device]

 As described above, according to the present invention, at least one of the rubber bush and the rubber bush holding member into which the rubber bush is press-fitted is formed of a material that is elastically deformable and moldable. Therefore, since resin can be used as the material, the weight of the mount used for the engine support structure can be reduced.

Further, according to the present invention, an engaging portion can be provided at a portion facing the rubber bush and the rubber bush holding member into which the rubber bush is press-fitted. Therefore, even if the press-fitting holding relationship between the rubber bush and its holding member cannot be maintained due to the characteristics of the material selected as the component of the tubular mount, the outer tube is inserted via the engaging portion. Since it is possible to regulate the movement of the outer cylinder in the press-fitting direction, it is possible to prevent the outer cylinder from coming off or coming off.

[Brief description of drawings]

FIG. 1 is a front view showing a cylindrical mount which is a main part of an engine support structure according to the present invention.

FIG. 2 is a perspective sectional view taken along the line AA in FIG.

3A and 3B are partial cross-sectional views for explaining a mounting state of a rubber bush and a rubber bush holding member that form the tubular mount shown in FIG. 1, where FIG. 3A is before press-fitting and FIG. Press-fitting is shown and (C) shows after press-fitting.

FIG. 4 is a diagram for explaining a load-distortion amount relationship for a rubber bush and a rubber bush holding member that form the tubular mount shown in FIG. 1.

[Explanation of symbols]

 10 tubular mount 12 rubber bush 14 rubber bush holding member 14A opening

Claims (3)

[Scope of utility model registration request] 1. An engine support structure including a tubular mount for supporting the weight of the engine and for damping vibrations from the engine, wherein the tubular mount has an inner cylinder and a rubber portion added therein. The rubber bush holding member includes a rubber bush provided with a sulfur-mounted outer cylinder, and a rubber bush holding member having an opening into which the rubber bush is press-fitted and having a connecting portion with the vehicle body side. An engine support structure, wherein an engaging portion that prevents the rubber bush from moving in the axial direction is formed on a surface of the opening of the rubber bush opposite to the outer cylinder of the rubber bush. 2. The engine support structure according to claim 1, wherein among the rubber bush and the rubber bush holding member,
An engine support structure, at least one of which is made of an elastically deformable resin material. 3. The engine support structure according to claim 1, wherein the engaging portion is formed along an outer peripheral surface of the rubber bush and an opening of the rubber bush holding member along a press-fitting direction of the rubber bush. An engine support structure characterized in that it is configured by a concave and convex portion.