JPS60132736A - Preparation of vibration proof rubber with metal housing - Google Patents

Abstract

PURPOSE:To introduce a rubber member into a metal housing under low pressure, by introducing said rubber member under a specific condition such that an adhesive is applied to the surface of the rubber member and dried while a thermosetting surface treating agent is applied to the surfaces, which receive the rubber member under pressure, of the metal housing. CONSTITUTION:An adhesive 7 is applied to the surface of a rubber member 6 and dried while the surfaces 2, 5, which receive the rubber member 6 under pressure, of a metal housing 1, 3 are coated with a thermosetting surface treating agent 10. The metal housings 1, 3 are heated to the softening temp. or more of the adhesive 7 and the rubber member 6 is introduced between the pressure introducing surfaces 2, 5 to cure the adhesive 7. A lubricant for pressure introduction becomes unnecessary and strong bonding strength can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a method of manufacturing a vibration isolating rubber with a metal housing such as a dumbab pulley.

Prior Art When a rubber member is press-fitted between metal housings, for example when a rubber ring is press-fitted between a gooley rim and an inner hub in a damper boot +j-, a lubricant for press-fitting is added to the rubber member to ensure smooth press-fitting. Usually process oil is applied. In this case, in order to prevent the rubber member from coming off after press-fitting and maintain durability, it is necessary to use a rubber material with good compression set, or to bond the rubber member and the metal housing. be.

Conventionally, the above bonding method involves first applying an adhesive to the inner surface of the metal housing, then press-fitting a rubber member whose surface is coated with the press-fitting lubricant into the same metal housing.
A different method was to use heat to cure the adhesive by reaction, but the process was complicated and the workability was not good.

Another method is to apply a thermoplastic or thermosetting adhesive to the surface of a rubber member, dry it, and then press fit the same rubber member between metal housings heated to a temperature higher than the softening temperature of the adhesive. A method of bonding the rubber member to the metal housing by curing the adhesive has also been considered (Japanese Patent Application No. 58-183196), which allows easy press-fitting and strong adhesion without using a press-fitting lubricant. It has other effects such as gaining strength. However, even with this latter method, problems remain, such as when the press-fitting surface of the metal housing is rough, the adhesive film breaks during press-fitting, and the required pressure input increases. .

Purpose This invention was made in order to solve the problems in the conventional press-fitting gluing method for rubber as described above. You can easily press-fit rubber parts into metal parts with low press-fitting pressure even if the cleaning surface of the metal part is rough and dusty. The company is famous for providing a new method for manufacturing vibration-proof rubber with a metal housing that can obtain strong adhesive strength, is simple, has excellent workability, and can reduce costs.

Structure - □The manufacturing method of the vibration isolating rubber with a metal housing of the present invention involves applying a thermoplastic or thermosetting adhesive to the surface of the rubber member and drying it, and applying a thermosetting adhesive to the press-fitted surface of the metal housing. Apply a surface treatment agent, heat the metal housing above the softening temperature of the adhesive, press the rubber member between the press-fit surfaces of the metal housing, allow the adhesive to harden, and then insert the rubber member into the metal housing. The structure is such that it can be adhered to.゛Example: Hereinafter, various examples in which the present invention was implemented in a damper pulley will be explained with reference to the drawings.In the drawing, 1 is the pulley rim below the damper barb, which is formed in a metal sill shape. , the inner circumferential surface 2 is usually a cylindrical surface with rough surface roughness due to cutting resistance and the like. Reference numeral 3 denotes an inner tube made of metal disposed within the damper pulley 1, and a shaft hole 4 is provided in the center thereof. Reference numeral 5 designates the outer circumferential surface of the inner hub 3, which is a cylindrical surface facing the inner circumferential surface 2 of the pulley rim 1 at a small distance, and is a rough surface like the inner circumferential surface 2.

Above, the inner peripheral surface 2 of the pulley rim 1, the inner surface 1, and the inner surface 3
The outer circumferential surface 5 of the button is required to be smooth in order to smoothly perform press-fitting, which will be described later. Therefore, in this embodiment, each of the above surfaces 2,
5 is treated as follows.

That is, 10 is a surface treatment agent applied to the curve, the orientation peripheral surface 2, and the outer peripheral surface 5 and dried, and is a thermosetting treatment agent containing phenol resin as a main component. (trade name of Son Chemicals) is used. The same surface treatment agent 10 is cured after drying, and both surfaces 2, 5. It firmly adheres to the surface and improves the smoothness of both surfaces 2 and 5.

The margin 6 below is a rubber ring press-fitted and glued between the inner peripheral surface 2 of the pulley rim 1 and the outer peripheral surface 5 of the inner hub 3.
As shown in Table 1 above, vulcanized rubbers with eight types of rubber formulations, Formulation A to Formulation C (Table 1 shows the weight ratio), are used.

Adhesive 7 is applied and dried on the inner and outer peripheral surfaces of the rubber ring 6 before press-fitting, and after press-fitting, the adhesive 7 is heated and hardened as described later, and the rubber ring 6 is attached to the pulley rim. 1 and the inner hub 3.

Here, the adhesive 7 can be a conventional thermosetting or thermoplastic rubber-to-metal adhesive, such as Chemlock 25O (trade name of Hewson Chemicals).

Next, a method for press-fitting and bonding the rubber ring 6 between the pulley rim 1 and the inner hub 3 in the damper pulley configured as described above will be described based on test examples.

First, before press-fitting, the adhesive 7 was applied to the surface of the rubber ring 60 of each formulation A to C, and then air-dried at room temperature.

Next, the surface roughness of the inner circumferential surface 2 of the pulley rim 1 and the outer circumferential surface 5 of the inner hub 3 was measured using the 10-point average roughness of JIS B-0601 and found to be 18Z. After degreasing both surfaces, the surface A treatment agent 10 was applied and air-dried at room temperature. After that, the pulley rim 1 and the inner hub 3 are heated to 200"O, which is higher than the softening temperature of the adhesive 7. Any method may be used for this heating, but here, it is preferable to use a method that has good thermal efficiency and can raise the temperature in a short time. This was done by induction heating.

Next, as shown in FIGS. 2 to 4, the heated inner hub 3 is set inside the heated pulley rim 1, and the inner hub 3 is placed between the inner circumferential surface 2 of the pulley rim 1 and the outer circumferential surface 5 of the inner hub 3. The rubber rings 6 of each of the formulations A to C are press-fitted. Here, the press-fitting rate of the rubber ring 6 (deformation rate due to press-fitting)
was set at 80%. During this press-fitting, the adhesive 7 on the surface of the rubber ring 6 is heated to a temperature higher than its softening temperature, so it immediately softens, and this exhibits a lubricating effect similar to that of a press-fitting lubricant. Therefore, the rubber ring 6 can be easily press-fitted with low pressure. Table 2 shows the values of the press-fitting pressure required during this press-fitting.
Shown below.

For comparison, Table 2 shows a comparative example in which the surface treatment agent 10 was not applied to the inner circumferential surface 2 of the pulley rim 1 and the outer circumferential surface 5 of the inner hub 3, and the rough surfaces were left as they were after cutting. The conditions are the same as in this example).

Table 2 As is clear from Table 2, in this example, in any of the rubber formulations, positive work can be performed with a press-in pressure of 6" or less than h in the case of the comparative example. This is because the surface on each of the surfaces 2 and 5 This is thought to be because the treatment agent 10 improves the smoothness of the surfaces 2 and 5, and since the surface treatment agent 10 itself has excellent lubricity, it acts as a lubricant.

Next, in order to adhere the rubber ring 6 to the pulley rim 1 and inner hub 3, the damper pulley that has been press-fitted is held in hot air at 150°C for 20 minutes to complete the curing reaction of the adhesive 7. It may be cooled to room temperature.

After the damper pulley on which the rubber ring 6 has been press-fitted and bonded as described above is left at room temperature for 24 hours, 1/8 of the entire circumference is cut off as shown in FIG. A tensile test was performed on the end of the pulley rim 1 and the end of the rubber ring 6 at a tensile rate of 50 f/min to measure the adhesive strength between the pulley rim 1 and the rubber ring 6. Table 8 shows the adhesive strength when the rubber ring 6 was partially peeled off from the pulley rim 1 at this time.

For comparison, Table 3 also shows the values of the press-in pressure when the surface treatment agent 10 listed in Table 2 is not used.

Table 8 Adhesive Strength (kg 7cm2) As is clear from Table 8, the adhesive strength of this example is 3 to 5 times higher than that of the comparative example.

This is because the surface treatment agent 10 applied to the inner peripheral surface 2 of the pulley rim 1 and the outer peripheral surface 5 of the inner hub 3 firmly adheres to each surface 2, 5, and has excellent adhesion with the adhesive 7. It is.

Further, in this embodiment, since no lubricant for press-fitting is applied, the process is simple and workability is excellent, and costs can be reduced.

It should be noted that the present invention is not limited to the configuration of the above-mentioned embodiment, and can be embodied as follows, for example.

(1) As the surface treatment agent 1Q, in addition to the one containing the phenol resin as a main component, various kinds of additives having thermosetting properties can be used.

(2) Change the material of the rubber ring 6, the type of adhesive 1, etc.

(3) Specify various metal housings other than damper pulley products.

Effects As detailed above, the present invention applies thermoplastic or thermosetting adhesive 7 to the surface of rubber member 6 and dries it, and also applies thermosetting adhesive to press-fit surfaces 2 and 5 of metal housing 1°3. After applying a surface treatment agent 10, the metal housing 1,
3 is heated to a temperature higher than the softening temperature of the adhesive 1, and then a rubber member 6 is press-fitted between the press-fit surfaces 2 and 5 of the same metal housing 1°3, the adhesive 1 is cured, and the rubber member 6 is attached to the metal housing. 1.3- Since the adhesive acts as a lubricant for press-fitting, there is no need to use lubricant for press-fitting, and even if the press-fitting surface of the metal housing is rough, the rubber member can be inserted with low press-fitting pressure. It can be easily press-fitted into the metal housing and has a strong adhesive force.
The process is simple, has excellent workability, and has an excellent effect of reducing costs.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing an embodiment of the present invention in a damper pulley, Fig. 2 is an exploded perspective view, and Figs. 3 and 4 show the rubber ring in the middle of press-fitting and after press-fitting, respectively. FIG. 5 is a plan view showing the damper pulley cut in the same manner, and FIG. 6 is a schematic diagram showing the tensile test method. Pulley rim 1, inner hub 8, rubber ring 6, adhesive 7° Patent applicant Toyoda Gosei Co., Ltd. Toyota Motor Corporation Agent Patent attorney Hironobu Onda Continued from page 1 ■ Int, CI, 4 Identification code Office reference number [ ] Inventor Nakakubo Civil Department 1 Toyotafu Toyota-cho Toyota Motor Corporation

Claims (1)

[Claims] 1. Applying a thermoplastic or thermosetting adhesive (1) to the surface of the rubber member (6) and drying it,
Apply a thermosetting surface treatment agent (1O) to the press-fit surface (2°5) of the metal housing (1, 3), and heat the metal housing (1ts) to a temperature higher than the softening temperature of the adhesive (7). After heating the same metal...the press-fit surface ('2
．． 5”), press fit the rubber member (6) between the
The rubber member (6) is cured and the metal housing (
1, 3) A method for producing a vibration isolating rubber with a metal mounting, characterized in that it is bonded to a metal housing. 2. Claim 1, characterized in that the surface treatment agent (1◎) is □ whose main component is phenolic resin.
A method for manufacturing a vibration isolating rubber with a metal housing as described in .