JPH0669470U - Engine support structure - Google Patents

Abstract

(57) [Abstract] [Purpose] An object is to provide an engine support structure having a structure capable of reducing the weight without increasing the manufacturing cost. A rubber bush having an outer cylinder 14 in which a rubber portion 16 vulcanized and bonded to the inner cylinder 12 is integrated is press-fitted to form a bracket 18 which is a mounting portion on the vehicle body side by resin. Therefore, the components of the mount can be made of lightweight resin.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

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

[0002]

[Prior art]

 As is well known, an engine mount structure is provided in an engine room of an automobile so as to support an engine and a transmission and prevent vibrations from the engine from being transmitted to a vehicle body.

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

By the way, in the engine support structure using such a cylindrical mount, the rubber bush is pre-compressed before 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 the dimensions that include the inner diameter for inserting the rubber portion and the press-fitting and compression allowances into the bracket. The outer cylinder is conventionally formed of a sheet metal member made of steel or the like, which has relatively high durability against deformation.

[0005]

[Problems to be solved by the device]

 By the way, in recent years, there has been an increasing demand for weight reduction of vehicle body components, and tubular mounts are 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 an engine mount, which is one of vehicle body constituent parts, without significantly affecting an increase in manufacturing cost. To provide.

[0007]

[Means for Solving the Problems]

 In order to achieve this object, the invention according to claim 1 is an engine support structure including a cylindrical mount for absorbing the weight of the engine and vibration from the engine, wherein the cylindrical mount comprises: An outer cylinder in which an inner cylinder and a rubber portion are integrated, and a bracket having an opening into which the outer cylinder is press-fitted are provided, and the bracket is a resin molding in which a connecting portion with the vehicle body is inserted. It is characterized by being composed of products.

According to a second aspect of the invention, in the engine support structure according to the first aspect, the bracket is formed of at least a material having heat resistance.

According to a third aspect of the invention, in the engine support structure according to the first aspect, the bracket is formed of a polyamide-based glass fiber reinforced plastic.

[0010]

[Action]

 According to the present invention, the bracket into which the outer cylinder is press-fitted is formed of resin. Therefore, the weight of the bracket, which is one of the components used for the engine support structure, can be reduced by utilizing the relatively simple mass production process called resin molding.

[0011]

【Example】

 1 and 2, the details of the embodiment of the present invention will be described below.

FIG. 1 shows a cylindrical mount which is an essential part of an engine support structure according to the present invention. The cylindrical mount 10 includes an inner cylinder 12, an outer cylinder 14, a rubber portion 16 and a bracket 18. It is equipped as a main component.

The inner cylinder 12 is made of a metal pipe located in the center of the rubber portion 16 like the cylindrical mount of this type, and is vulcanized and bonded to the outer cylinder 14 together with the rubber portion 16. .

The outer cylinder 14 is a member that is made by resin molding and has the inner cylinder 12 and the rubber portion 16 integrated therein.

On the other hand, the bracket 18 has a characteristic configuration of the present embodiment. In the embodiment, an opening 18A for press-fitting the outer cylinder 14 is formed, and the side surface of the bracket 18 hangs continuously in the upper half circumference. It is composed of a resin molded product formed on the surface to be covered. The bracket 18 is formed of a material having high heat resistance and chemical resistance in consideration of the high temperature of the place where it is installed. The chemical resistance in this case means, for example, durability against calcium chloride used as a snow melting agent for roads. Further, in this embodiment, as the material of the bracket 18, a so-called reinforced plastic in which a thermoplastic resin such as nylon, polyethylene terephthalate, polybutyl terephthalate or the like is reinforced with glass fiber or inorganic filler can be used. However, in particular, polyamide-based glass fiber reinforced plastics exhibiting unique chemical resistance with respect to the above-mentioned calcium chloride are selected. For example, the content of glass fibers is 30% to 60%, preferably 30 to 60%. It is molded from 50% nylon MXD6. This result (see Table 3) is based on the following experimental result.

The test conditions in the results shown in Tables 1 and 2 are as follows.

The heat resistance (rigidity of 100 ° C. or lower) is based on the temperature dependence of the flexural modulus (ASTM-D790) shown in FIG.

The impact resistance (strength caused by stepping stones when running on a rough road) is based on the Izod impact strength (ASMT-D256).

Regarding salt calcium resistance (strength reduction due to adhesion of antifreezing agent), heat cycle test (100 ° C. boiling water 1 hr → 23 ° C. ambient temperature × 0.5 hr → saturated calcium chloride solution coating → 100 ° C. × 0 The test process of 0.5 hr → 23 ° C. × 0.5 hr is defined as 1 cycle) and is repeated 10 cycles.

The salt calcium resistance is advantageous over other nylons because of the molecular structure having an aromatic ring and the low water absorption due to the molecular structure. In addition, generally, the higher the GF content, the lower the water absorption and the more advantageous the salt calcium resistance.

[Table 1]

[Table 2]

[Table 3] On the other hand, the opening 18A of the bracket 18 is set to have an inner diameter that allows press-fitting of the outer cylinder 14 and precompression of the rubber portion 16.

Further, the bottom surface of the hanging portion of the bracket 18 is attached to the vehicle body side. For this reason, a metal nut 20 (hereinafter referred to as an insert nut) forming a fastening portion is embedded in the bottom surface of the hanging portion. In this insert nut 20, for example, the shape of the head located on the bottom surface of the hanging portion is set to a rectangular shape, whereby a rotation stop at the time of fastening can be performed.

A recess 18 B is formed in the vicinity of the bottom surface of the hanging portion of the bracket 18 in the press-fitting direction of the outer cylinder 14, and a part of the bracket 18 is cut out to achieve weight reduction and a sink mark during molding. And the prevention of voids.

Since the present embodiment is configured as described above, the bracket 18B is resin-molded, and a rubber bush is press-fitted into the bracket 18 for assembly.

Then, the bracket 18 is attached to the vehicle body side by screwing the bolt into a metal nut 20 inserted in the hanging bottom surface.

According to this embodiment, in addition to the bracket 18, the outer cylinder 14 is also made of a resin molded product, so that the weight reduction as a cylindrical mount is further promoted. Regarding the outer cylinder, it is of course possible to use a metal pipe as in the conventional case.

In the present embodiment, the structure of the bracket has been described for the case where only the opening is provided, but the present invention is not limited to such a bracket. For example, up to the point where the opening is formed inside the bracket, the procedure is the same as in the above-described embodiment, but a plurality of recesses may be formed in the circumferential direction near the outer periphery of the opening. By doing so, it is possible to further reduce the weight by reducing the amount of meat located in the recess.

Further, in the above structure, it is possible to integrate the rubber portion directly vulcanizing and bonding the inner cylinder with the opening of the bracket 18. In this case, the rubber part cannot be pre-compressed, but it suffices to provide durability by appropriately selecting the characteristics of the rubber part. Therefore, when the rubber part is directly vulcanized or post-bonded with an adhesive, or when it is fitted into the recess of the bracket, the so-called outer cylinder can be omitted, and the number of parts can be reduced. In addition, although it depends on the material of the outer cylinder, for example, compared with the case where a metal pipe is used as the outer cylinder, the weight reduction is further promoted.

[0028]

[Effect of device]

 As described above, according to the present invention, the component parts of the engine mount can be composed of resin molded products, so that the weight of the parts can be reduced.

Further, by using the resin molding that can be mass-produced, it is possible to realize the weight reduction without significantly affecting the manufacturing cost.

[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 cross-sectional view taken along arrow AA in FIG.

FIG. 3 is a diagram for explaining characteristics of materials used for an engine support structure according to the present invention.

[Explanation of symbols]

 10 Tube Mount 12 Inner Tube 14 Outer Tube 18 Bracket

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Yukazu Kano Inventor, 10th street, Wakaicho, Toyota City, Aichi Prefecture, Hosei Break Industry Co., Ltd. (72) Yuichi Sakabe, 10th, Wakaicho, Toyota City, Aichi Prefecture Address: Hosei Break Industry Co., Ltd.

Claims (3)

[Scope of utility model registration request] 1. An engine support structure including a tubular mount for absorbing engine-side weight and vibration from the engine, wherein the tubular mount includes an inner cylinder and an outer cylinder in which a rubber portion is integrated. An engine supporting structure comprising: a bracket having an opening into which the outer cylinder is press-fitted; and the bracket being formed of a resin molded product into which a connecting portion with the vehicle body is inserted. 2. The engine support structure according to claim 1, wherein the bracket is formed of at least a heat resistant material. 3. The engine support structure according to claim 1, wherein the bracket is formed of polyamide glass fiber reinforced plastic.