JPS606774A - Production of torsional damper - Google Patents

Abstract

PURPOSE:To produce a torsional damper having excellent durability, by forming a specified adhesive layer on each of the outer periphery surface of an inner tubular member and the inner periphery surface of an outer tubular member and/or both sides of an elastic member, coating each of said surfaces with a lubricating oil compatible with the elastic member and pressing the elastic member into the space between the inner tube and the outer tube to bond it to them. CONSTITUTION:A adhesive layer mainly composed of chlorosulfonated polyethylene for after-vulcanization is formed on each of the outer periphery surface of an inner tubular member and the inner periphery surface of an outer tubular member and both sides of an elastic member and a lubricating oil compatible with said elastic member is applied to the outer surface of the inner tubular member and the inner surace of the outer tubular member and/or both sides of the elastic member. The elastic member is then pressed into the space between the inner tube and the outer tube at a required compression ratio and is bonded to them. By pressing the elastic member, a torsional damper can be obtd. which has excellent durability and can surely transmit power without causing the exhaustion of the elastic member due to heat history undergone during use and in which excessive stress is not concentrated at the bonded boundary and a peeling-off phenomenon is prevented from being caused at the bonded boundary.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a novel method for manufacturing a torsional damper that is attached to a rotating shaft and absorbs torsional vibration vJ of the same shaft.

In an internal combustion engine, especially a diesel engine, the crankshaft rotates in response to the reciprocating motion of the piston. Complex torsional vibrations may occur due to periodic interlocking of the pistons or unbalance of the piston crank mechanism, etc.
A torsional damper is attached to the crankshaft to absorb torsional vibrations.

Such a one-way red damper includes a rigid internal member fixed to a rotational shaft such as a crankshaft, and a rigid outer cylinder member as a damper mass disposed concentrically with the inner cylinder member on the outside of the inner cylinder member. Contains.

Of these two, an elastic member such as rubber is interposed as a buffer between the outer cylindrical member and the torsional vibration is absorbed by this elastic member and the damper mass rigid outer cylindrical member. .

By the way, the method for manufacturing such a torsional damper is as follows. A vulcanized adhesive is applied to the outer peripheral surface of the inner cylinder member and the inner peripheral surface of the outer cylinder member, and then the inner and outer cylinder parts are arranged concentrically and between the core and the outer cylinder member.

Method of injecting unvulcanized rubber and vulcanization bonding (see below).

(referred to as vulcanization adhesive type method), or (d above).

A method of press-fitting an elastic member, which has been vulcanized into a cylindrical or band-like shape, between outer cylinder members at a predetermined compression ratio (
Hereinafter referred to as a press-fit type method), etc. are well known.

However, such conventional method 1.1 is comparatively j,! j
! Although Il-'1 is easy, the torsional damper obtained thereby has the following drawbacks.

That is, since no precompression is applied to the Monoke 2 elastic member obtained by the vulcanization adhesive type method, shrinkage strain due to molding of the elastic member occurs at the adhesive interface between the 9 elastic member and the rigid inner and outer cylinder members. In addition, when the damper is used, stress concentration occurs at this adhesive interface, which causes the elastic member to peel off, resulting in slippage between the elastic member and the rigid inner and outer cylinder members. There is a problem in that the torque transmission function is eventually lost.

Although it has the advantage of being able to be manufactured at a low cost, there are restrictions on the wall thickness between the two elastic parts (the rigidity and the gap between the outer cylinder members are limited).
), and in reality, a large press-fitting allowance cannot be taken, and furthermore, if the elastic part deteriorates due to the thermal history it receives during use, the elastic part and the rigidity Φ will be reduced between the inner and outer cylindrical members and each other. This causes slippage and preforming.

There is a problem like this.

I-H! 1, and a method of using the two methods of niI in combination, that is, on the inner circumferential surface of the outer cylinder member and the outer circumferential surface of a cylindrical intermediate member (ring) disposed concentrically inside the outer cylinder member. After applying a vulcanized adhesive and vulcanizing and adhering 74 mm of unvulcanized rubber between the outer cylindrical portion and the intermediate member, 011. A method has been proposed in which the entire internal cylindrical member is press-fitted to apply preliminary compression to the elastic member (hereinafter referred to as the ring press-fitting method), but this method requires a large number of processing steps and is expensive.

The present invention is a bow! To provide a new manufacturing method that solves the above-mentioned conventional problems and that can easily and inexpensively manufacture a highly durable torsional damper that can reliably transmit power. The purpose is to

The feature of the present invention is that, as described in the claims, an adhesive mainly composed of chloronulfonated polyethylene is applied to the outer circumferential surface of the inner cylinder side, the inner circumferential surface of the outer cylinder member, and/or both surfaces of the elastic member. An adhesive layer containing chlorosulfonated polyethylene as a main component is formed. 1. A lubricating oil compatible with the elastic member is applied to the outer circumferential surface of the inner cylinder member, the inner circumferential surface of the outer cylinder member, and both sides of the elastic member. After the elastic member is press-fitted between the inner and outer cylindrical members at a predetermined shrinkage ratio of H, the elastic member and the inner and outer cylindrical members are bonded together.

The following two aspects of the present invention will be explained in detail.

As the adhesive in the present invention, an adhesive whose main component is chlorosulfonated polyethylene is used. This adhesive is made by appropriately blending a curing agent, filler, pigment, etc. with chlorosulfonated polyethylene.

These are dissolved and dispersed in an organic solvent, and the solution viscosity is usually adjusted to 100 to 1000 centipoise (20°C).

This adhesive is used by applying it with a brush or the like to the outer circumferential surface of the inner periphery, the inner circumferential surface of the outer cylinder member, and/or both surfaces of the elastic member and drying to form an adhesive layer. Drying may be natural drying or forced drying. The coating thickness of the adhesive layer is usually 5 to 100 μm.

The adhesive used in the present invention is preferably one that will not be destroyed by scraping off the coating of the adhesive layer when the elastic member between the inner and outer members is press-fitted. In this respect, the above-mentioned adhesive is used in combination with a sole polymeric polymer (and thus as a post-vulcanization adhesive to enable post-bonding of metal and vulcanized rubber), and is similar to conventional metal Compared to vulcanized adhesives made with and unvulcanized rubber, the coating film strength tends to be stronger.Therefore, room temperature curing type resin adhesives are used in terms of coating film strength when press-fitting two elastic members. Can not.

On the other hand, adhesives for post-vulcanization are used in various ways depending on the quality of the unvulcanized rubber to which they are applied, whereas adhesives for post-vulcanization can be used alone or in combination with a primer to vulcanize a wide range of materials. It has the characteristic of being able to adhere to rubber.

As the elastic member in the present invention, natural rubber (hereinafter, N
Styrene-butadiene rubber (hereinafter referred to as SB), chloroglene rubber C (hereinafter referred to as OR), acrylonitrile-butadiencom (hereinafter referred to as NBR), !:
), butyl rubber (hereinafter referred to as II), chlorinated glutyl rubber (hereinafter referred to as II).

Rubber such as CJ-II (referred to as CJ-II) or a mixture of these rubbers may be used as required, and may be vulcanized and molded into a cylindrical or band shape in advance.

The lubricating oil in the present invention includes those of the elastic member rough-in type, naphthene type, and aroma thread; /+E, %, jl)
.

Examples of plasticizers include derivatives of adipic acid, phthalic acid, and sepacic acid, which improve the elasticity +41i 1
It is selected and used as appropriate depending on the person's ability.

The purpose of use of this lubricating oil is to protect the adhesive layer and improve the press-fitting properties when press-fitting between the outer cylinder members of the elastic member, and to quickly penetrate the inside of the elastic member during subsequent bonding. , does not remain on the adhesive interface, and the contact fn'c
l111 Those that do not cause any harm are used.

The compression ratio in press-fitting the elastic member in the present invention may be appropriately selected as required, but it is likely to be 10 to 40%, preferably 20, with respect to 0 on both sides of the elastic member.

Furthermore, as an adhesion method in the present invention, there is a means for applying force energy (=1) to the adhesive interface, for example.

Treatment, ultrasonic waves, infrared irradiation, etc. are used as necessary, but heat treatment can be carried out by placing a large amount of the product at once into a vulcanizing can, such as a constant temperature bath.

It has advantages in terms of work efficiency and cost, and ultrasonic waves, infrared irradiation, etc. can facilitate adhesion in a short time.

In addition, since a post-vulcanization adhesive is used for bonding, there is the advantage that even if the bonding is not completely completed, the bonding will be completed by the testing experience received during use of the product. .

As explained below (4ji 141 parts J-1), using a post-vulcanization adhesive mainly composed of chloronulphonated polyethylene having excellent coating strength that can withstand press-fitting of 141 parts J-1.
In addition to facilitating the press-fitting of the elastic member,
When bonded, it quickly penetrates into the interior of the Ijlll material,
Use a lubricant that is compatible with the elastic member and does not remain on the adhesive interface or inhibit adhesion.

Furthermore, an adhesion method is adopted in which the first elastic member is pre-compressed and post-vulcanization is performed.

According to the present invention using the above combination, since the elastic member is press-fitted in a pre-compressed state at a predetermined compression ratio, there is no occurrence of excessive stress concentration at the adhesive interface, and peeling at the adhesive interface is prevented. Current license is prevented and also.

It is possible to create a torsional damper with excellent durability that can reliably transmit power without the above-mentioned problems caused by the fatigue of the elastic member due to the thermal history received during use. It is possible to manufacture products with better performance than the sulfur adhesive type method and the press-fit type method, and at a lower cost than the sulfur/glue press-fit quiz method.

Furthermore, as an additional effect of the present invention, this type of adhesive according to the present invention is used for post-vulcanization.

As mentioned above, it is possible to bond to elastic members made of a wide range of materials, so it is possible to select an adhesive according to the material of the material. Also, there is no need to manage multiple types of adhesives.

The labor required for process control is significantly reduced, and on the other hand, a wide range of 4-barrel elastic members can be used depending on the purpose and application, increasing the degree of freedom in product design.

Next, one embodiment of the present invention will be explained based on an example.

Example inner cylinder member (inner diameter 30mm, outer diameter 10mm, outer peripheral width 30mm)
fl), outer cylinder part (O (inner diameter 107mm, outer diameter 160mm,
An elastic member (length 330M, width 2
5 pus, meat J! ¥4-65N).

A 1-national damper was manufactured under the manufacturing conditions shown in Table 1.

That is, adhesive was applied to the outer circumferential surface of the inner cylinder member and the inner circumferential surface of the outer cylinder member to a coating thickness of 20μ, and air-dried to form an adhesive layer mainly composed of chlorosulfonated polyethylene. I got 7. Of these two, the outer cylinder member was placed concentrically within the jig. At this time, the gap between the outer peripheral surface of the inner cylinder member and the inner peripheral surface of the outer cylinder member is 3.5 mm (corresponding to the wall thickness after the elastic member is press-fitted).

Next, both sides of the elastic member are coated.

After immersing the elastic member in lubricating oil, it is press-fitted between the inner and outer cylinder members at a predetermined compression rate (25% in the example),
An elastic part set is formed in a cylindrical shape between the inner and outer cylindrical members.

Furthermore, this f: The elastic member was bonded to the inner and outer cylinder parts by various bonding methods (post-bonding).

The performance of the thus manufactured torsional damper was evaluated by conducting an adhesion test (product pull-out force) and a durability test (torsion durability test). The results are shown in Table 1.

Comparative Example 1 As shown in Table 2, product f: obtained by the press-fit tights method,
The same test as in the example was conducted to evaluate the performance. The results are also shown in Table 2.

Comparative Example 2 As shown in Table 2, a product was obtained using the vulcanization adhesive type method, and the same tests as in the example were conducted to evaluate the performance. As the adhesive, a J■ standard vulcanized adhesive was used.

The results are also shown in Table 2.

Comparative example 3 Using an IIR vulcanizing adhesive as shown in Table 2.

A product was obtained in the same manner as in Example 2, and the same tests as in Example were conducted to evaluate the performance. The results are also shown in Table 2.

In the adhesion test (product pulling force), the force required to pull out the outer cylinder member in the axial direction with the inner cylinder part paulownia identified was measured. The measurement conditions were to hold the blank at room temperature and in a 100°C atmosphere (11R at 100°C for 2 hours).

In addition, the durability test (torsion durability test) is expressed by the number of repetitions when the blank product is subjected to the initial torsion angle amplitude of ±3° at room temperature.

Table 2

Claims (1)

[Scope of Claims] A cylindrical or strip-shaped member is formed in advance between the rigid inner cylinder side that is attached to the rotating shaft and the rigid outer cylinder member that serves as a damper mass and is arranged concentrically with respect to the rigid inner cylinder member. In a method for manufacturing a torsional damper in which a sulfur-molded elastic member is press-fitted and fixed. An adhesive layer mainly composed of chlorosulfonated polyethylene is coated on the outer peripheral surface of the inner cylinder member, the inner peripheral surface of the outer cylinder member, and/or on both sides of the straddle elastic member. Formation 1 Next, apply a lubricating oil compatible with the elastic member to the outer circumferential surface of the inner cylinder member, the inner circumferential surface of the outer cylinder member, and/or both surfaces of the elastic member. 1. A method of manufacturing a torsional damper, which comprises press-fitting the elastic member between the inner and outer cylinder members at a predetermined compression ratio, and then bonding the elastic member to the inner and outer cylinder members.