JP5337567B2 - Elastic joint and manufacturing method thereof - Google Patents

Description

  The present invention relates to an elastic joint suitable for application to a rotational force transmission shaft such as a propeller shaft and a steering shaft of an automobile, and more particularly to an elastic joint having high production efficiency and excellent durability and a method for manufacturing the same. is there.

  As an elastic joint, there is one formed by connecting each of a plurality of metal cylinders to a board body through a rubber member.

  As a method of manufacturing such an elastic joint, Patent Document 1 discloses that a rubber member is first integrated around each cylinder body by vulcanization adhesion, and then a cylinder body made of polyamide resin is injection molded, and then the cylinder body is formed. In addition, it is disclosed that the respective cylinders and the board, which are press-fitted into the board under reduced diameter deformation of the surrounding rubber and vulcanized and bonded to the rubber member, are integrally manufactured.

  However, in the elastic joint manufactured by the manufacturing method described in Patent Document 1, since the rubber member and the board are not sufficiently bonded, the rubber member comes out of the board with repeated deformation of the rubber member. There was a problem of durability.

In order to cope with such a problem, when the rubber member and the polyamide resin are bonded through an adhesive layer, the outer peripheral surface of the rubber member vulcanized and bonded to the cylindrical body is subjected to cleaning treatment such as degreasing and the primer. In addition to the need for a plurality of processes such as applying an adhesive to the outer peripheral surface of the rubber member, the primer treatment agent may adhere to the metallic cylinder and rust may occur. there were.
On the other hand, since the rubber member is small, there is another problem that it is difficult to appropriately apply an adhesive to the rubber surface.

Japanese Patent No. 2696307

  Therefore, the present invention provides an elastic joint having high productivity and excellent durability without applying an adhesive to a rubber member, and a method for manufacturing the same.

The elastic joint according to the present invention includes a plurality of cylinders connected to each of the driving side member and the driven side member at predetermined intervals in the circumferential direction, It is fixed to the board through a rubber member that surrounds the board, and is a board that controls transmission of power under buffering. The rubber member is made of natural rubber / styrene-butadiene copolymer rubber, and body Ri Do polyphenylene ether, Banthai has a recess, a notch which is bonded to the tubular body via a rubber member, a runner groove that branches from the recesses in the notch, the cylindrical body, a metal material it is made of is characterized in.

In the method of manufacturing the elastic joint, the panel body made of a polyphenylene ether, a metal material, by injecting the rubber material consisting of natural rubber / styrene-butadiene copolymer rubber into between the plurality of the cylindrical body upon molding, the injected rubber material, along the runner groove formed in the board body, and spaced in the circumferential direction of the panel body, Rutotomoni to flow around each of the cylindrical body, the rubber material Vulcanized and bonded to the cylinder and diffusion bonded to the board.

  The conventional elastic joint has been desired to improve durability and productivity. In the present invention, the rubber member vulcanized and bonded around each cylindrical body is made of natural rubber / styrene-butadiene copolymer rubber. In addition, the board is made of polyphenylene ether, and natural rubber / styrene / butadiene copolymer rubber and polyphenylene ether are bonded sufficiently firmly by direct diffusion bonding without an adhesive layer. Therefore, it is possible to effectively prevent the rubber member from unexpectedly coming out of the board body and greatly improve the durability, and to remove all problems caused by applying the adhesive to the rubber member. At the same time, the productivity of the elastic joint can be advantageously improved.

  And by making the board body made of polyphenylene ether, the adhesive strength between the rubber member and the board body is sufficiently ensured, and the physical properties such as the elastic modulus and molding shrinkage rate of the board body are compared with those of the conventional polyamide resin. It can be the same as the board.

It is sectional drawing which shows one Embodiment of the elastic coupling of this invention. (A)-(c) is a figure which shows one Embodiment of the manufacturing method of the elastic coupling of this invention. It is sectional drawing which shows other embodiment of the elastic coupling of this invention.

The elastic joint of the present invention will be described below in detail with reference to the drawings.
FIG. 1 is a cross-sectional view showing one embodiment of the elastic joint of the present invention.

  In the figure, 1 indicates a disk-shaped elastic joint, and 2 indicates a cylindrical body.

The illustrated elastic joint 1 includes a cylindrical cylindrical body 2 and a disk body 4 made of a resin material connected to the outer periphery of the cylindrical body 2 via a rubber member 3. Each of the four cylinders 2 connected to each of the side members is arranged concentrically at a predetermined interval in the circumferential direction, for example, at an angular interval of 30 to 120 °.
Here, these cylinders 2 are directly fixed to the board 4 by a rubber member 3 surrounding them.

The rubber member 3 can absorb vibration during rotation driving of the driven side member by the driving side member, reduce a shock against a sudden load, and reduce noise. In addition, the core of the driving side member and the driven side member can be reduced. Misalignment can be absorbed.
In this case, the board 4 exhibits a resistance against the force in the separation direction and the force in the proximity direction between the cylinder 2 connected to the driving side member and the cylinder 2 connected to the driven member. Can do.

  By the way, in this elastic joint 1, the rubber member 3 is made of natural rubber / styrene / butadiene copolymer rubber, and the disc body 4 is made of polyphenylene ether.

  The blending ratio of the natural rubber / styrene-butadiene copolymer rubber used for the rubber member 3 is preferably 5 to 60%, particularly preferably 30%.

  The polyphenylene ether homopolymer used for the board 4 includes poly (2,6-dimethyl-1,4-phenylene) ether, poly (2-methyl-6-ethyl-1,4-phenylene) ether, poly (2,6-diethyl-1,4-phenylene) ether, poly (2,6-diphenyl-1,4-phenylene) ether, poly (2,3,6-trimethyl-1,4-phenylene) ether, etc. Can be mentioned.

  Examples of the copolymer of polyphenylene ether include 2,6-dimethylphenol and a copolymer of 2,3,6-trimethylphenol, a copolymer of 2,6-diphenylphenol, or o-cresol. A copolymer etc. are mentioned.

Polyphenylene ethers not only polyphenylene ether, denatured polyphenylene ether polyphenylene ether was like alloyed styrenic resin or polyamide resin may also be included.

  In the present invention, the rubber member 3 vulcanized and bonded around each cylindrical body 2 and the disc body 4 are bonded sufficiently firmly by direct diffusion bonding without an adhesive layer. In addition, it is possible to effectively prevent unintentional slipping out of the board 4 and greatly improve the durability.

FIGS. 2A to 2C are views showing an embodiment of the method for producing an elastic joint of the present invention.
Such an elastic joint 1 is formed as follows, for example.
First, as shown in FIG. 2 (a), a disk body 4 made of polyphenylene ether is formed by cutting four cutout portions 5 at intervals of 90 ° in a form cut out from a disk by a predetermined arc.
The Ban Tai 4, for example, a concave portion 6 is provided at the center to form a runner channel 7 branching from the recess 6 to the four notches 5.

  Next, as shown in FIG. 2 (b), the cylinder body 2 is placed in the rubber mold and the cylinders 2 to be bonded are arranged in the center of the cutout portion 5 of the disk body 4 so as to define the cavity. To contribute.

Then, as shown in FIG. 2 (c), a rubber material made of natural rubber / styrene / butadiene copolymer rubber is injected into the recess 6 of the board 4 and passes through the respective runner grooves 7 to form four locations. The rubber material flows into the notch 5 while suppressing heat generation, and the rubber material flows into the notch 5 and between the disc body 4 and the cylinder 2. Thereafter, the rubber material is vulcanized, and the rubber member 3 and the board 4 are infiltrated and bonded by the heat at the time of vulcanization.
In particular, when the rubber member 3 is made of natural rubber / styrene / butadiene copolymer rubber and the board 4 is made of polyphenylene ether, the rubber member 3 can be bonded due to the affinity between the polyphenylene ether and the styrene / butadiene copolymer rubber.

By manufacturing the elastic joint 1 by such a manufacturing method, a diffusion reaction between the natural rubber / styrene-butadiene copolymer rubber and polyphenylene ether that can be bonded with excellent adhesive force, and the cylinder 2 and the rubber member 3 By vulcanizing and bonding, the cylindrical body 2, the rubber member 3, and the board 4 can be integrated without the need for a process for applying an adhesive to the rubber member 3. And the productivity of the elastic joint 1 can be improved.
Moreover, since it is not necessary to apply a primer treatment agent and an adhesive to the rubber member 3, it is possible to reduce the occurrence of rust due to adhesion of the primer treatment agent or the like to the cylindrical body 2.

  Preheating the body 4 in advance to activate the adhesion reaction between the rubber member 3 and the body 4 or lowering the mold temperature of the rubber member 3 to accelerate the vulcanization of the rubber member 3 at an appropriate temperature and delay the reaction timing. Can be made.

  In such a manufacturing method, the positional accuracy of the rubber member 3 and the like can be stabilized by forming the disk body 4 first.

  Further, the injected rubber member 3 is made to flow around the respective cylindrical bodies 2 arranged at intervals in the circumferential direction of the board body 4 along the runner grooves 7 formed in the board body 4. The rubber material is allowed to flow evenly without providing a gate, etc., and the integration of the plurality of cylinders 2 and the rubber member 3 can be completed at one time, thereby reducing the number of steps and reducing the deburring and the like, resulting in high productivity. .

  By the way, for example, in order to increase the pressure at the time of adhesion between the rubber member 3 and the board 4, as shown in FIG. 3, an arc portion 8 cut by an arc is formed in the disc-like board 4. The rubber member 3 can be poured into the circular arc portion 8 and the circular arc portion 8 can surround the rubber member 3 and the like.

DESCRIPTION OF SYMBOLS 1 Elastic coupling 2 Tubular body 3 Rubber member 4 Board body 5 Notch part 6 Recessed part 7 Runner groove 8 Arc part

Claims (2)

A plurality of cylinders connected to each of the driving side member and the driven side member are arranged at a predetermined interval in the circumferential direction, and these cylinders are interposed via a rubber member surrounding the periphery. It is an elastic joint that is fixed to the board and controls power transmission under buffering.
Its rubber member is made of natural rubber / styrene-butadiene copolymer rubber, Banthai is Ri Do polyphenylene ether,
The board includes a recess, a cutout portion that is bonded to the cylindrical body via a rubber member, and a runner groove that branches from the recess to the cutout portion.
The cylindrical joint is made of a metal material . When injecting and molding a rubber material made of natural rubber / styrene-butadiene copolymer rubber between a board made of polyphenylene ether and a plurality of cylinders made of a metal material , the injected rubber material is along the runner groove formed in the board body, and spaced in the circumferential direction of the panel body, to flow around the respective cylindrical body Rutotomoni, by vulcanization bonding the rubber material in the cylindrical body, Banthai A method of manufacturing an elastic joint that is diffused and bonded to the surface.

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