JPH0144805Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a rubber sintered pin used in a rotation prevention joint between parts of a mechanical seal.

[Conventional technology]

Conventionally, various pins have been used as means for connecting members of mechanical devices. For example, in a mechanical seal as shown in FIG.
Knock pins 5 are used to prevent rotation by engagement between the sleeve 53 and the fixed ring 51, and between the sleeve 53 and the rotating ring 54, which are externally fitted onto the rotating shaft 52.
5, 55... are used.

[Problem that the invention attempts to solve]

However, this type of pin generally has a structure in which it is installed upright on a member by shaft-fitting, so it is made of a hard metal material, and the engaging part may be repeatedly used over a long period of time. There was a problem in that the engaging portion was worn and damaged by the impact. Particularly when used for mechanical seals, the member on the engaged side is fixed ring 5.
1 or the rotating ring 54, etc., are made of hard and fragile members such as SiC, so the repeated impact causes cracks in the engagement portion with the knock pin 55, significantly reducing the shaft sealing performance. It had drawbacks.

The present invention was developed in view of the above-mentioned problems, and provides a rubber-sealed pin that absorbs the repeated impact of the engaging part by adding a buffer member to the pin structure, and that can be easily installed and fixed to a member. The purpose is to

[Means for solving problems]

The rubber sintered pin of the present invention has a large diameter press-fit base formed on the rear end side of the core shaft made of a hard material such as metal, which is press-fitted into a shaft hole formed through one member, and the core shaft A small diameter portion protruding from the one member and loosely engaged with the other member is formed on the distal end side of the member, a circumferential groove is formed between the small diameter portion and the press-fit base, and a circumferential groove is formed between the circumferential groove and the small diameter portion. A rubber cap is baked and fixed so as to cover the press-fit base, and the outer diameter of the rubber cap is smaller than the outer diameter of the press-fit base.

[Effect]

The above-mentioned rubber baking pin can absorb shock caused by contact with the other member by covering the small diameter part on the tip end side of the core shaft with a rubber crown. Since the material is adhered from the surface to the circumferential groove and forms a fitting structure with the circumferential groove, it is unlikely to peel off or fall off during use.

In addition, when installing this rubber-baked pin into the shaft hole, the tip side covered with a rubber cap is first inserted through the opening on the back side of the shaft hole (the opposite side to the other member), and then further The press-fitting base is press-fitted into the shaft hole by pressing the end, but at this time, since the rubber crown has a smaller diameter than the press-fitting base, it passes through the shaft hole without interfering with the shaft hole. Since the press-fit base is press-fitted into the shaft hole by pressing the rear end of the core shaft, the rubber crown is not damaged.

〔Example〕

Hereinafter, one embodiment of the rubber sizing pin of the present invention will be described with reference to FIGS. 1 and 2. Reference numeral 1 denotes a metal core shaft in the shape of a shaft with an appropriate length, and a circumferential groove is formed at the tip of a press-fit base 2 that has a shaft hole 14 (hole diameter D3) bored in the installed member and a predetermined shaft fitting tolerance. 3, a small diameter portion 4 having a smaller diameter D2 than the outer diameter D1 of the press-fit base 2 is formed. Reference numeral 5 denotes a rubber crown that is baked and fixed to the circumferential groove 3 and the small diameter portion 4, and is formed so that the outer diameter D4 is smaller than the press-fit base 2 of the core shaft 1, and the inner edge 6 is formed in the circumferential groove 3 portion. are fitted to form the engaging portion 7 of the pin.

The rubber baking pin 9 having the above configuration is used, for example, as shown in FIG.
A notch 12 formed at the end of the housing side member 13 is engaged with a rubber baking pin 9 provided upright on the housing side member 13 in the rotational direction. When fixing the rubber baking pin 9 upright, a shaft hole 14 (hole diameter D3) having a predetermined shaft fitting tolerance with the press-fit base 2 is bored in the housing side member 13, and the rubber is inserted from the back side of the shaft hole 14. The engaging portion 7 of the baking pin 9 is inserted, and the press-fitting base 2 is press-fitted into the shaft hole 14 so that the engaging portion 7 protrudes toward the engaging side. In this assembly process, the outer diameter D4 of the rubber crown 5, the outer diameter D1 of the press-fit base 2, and the outer diameter D3 of the shaft hole 14 have a relationship of D4<D3≦D1. 14 and will not be damaged by contact. In addition, the pressurizing action when press-fitting the rubber baking pin 9 is applied to the rear end of the press-fit base 2, that is, the rear end of the core shaft 1.
The rubber crown 5 of the engaging portion 7 will not be damaged.

In the locking mechanism for the sealing sliding ring of the mechanical seal 10, the engaging notch 12 of the rotating ring 11 engages in the rotational direction with the engaging part 7 of the rubber baking pin 9, and also in the axial direction. Becomes slidable. Therefore, drive is transmitted in the engagement direction via the rubber crown 5, and the elasticity of the rubber crown 5 acts as a shock absorber to prevent damage to the rotating ring 11.

[Effect of idea]

As described above, the rubber sintered pin of the present invention has a rubber cap attached to the tip end of the core shaft that loosely engages with the mating member, thereby absorbing the repeated impact caused by the engagement, and absorbing the repeated impact between the core shaft and the mating member. In addition, the rubber crown covering the tip end of the core shaft is not damaged during assembly, and the rubber crown is also prevented from falling off. play.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing an embodiment of the rubber sizing pin of the present invention, Fig. 2 is an exploded perspective view of the same, and Fig. 3 is a main part showing the detent mechanism constructed in the sealing sliding ring of the mechanical seal. FIG. 4 is a sectional view of a main part of a mechanical seal showing a conventional pin. 1...Core shaft, 2...Press-fit base, 3...Peripheral groove, 4
...Small diameter part, 5...Rubber crown, 7...Engagement part, 9...
...Rubber baked pin.

Claims (1)

[Scope of utility model registration request] A large-diameter press-fit base is formed on the rear end side of the core shaft made of a hard material such as metal, and is press-fitted into a shaft hole formed through one member, and a press-fit base part of a large diameter is formed on the front end side of the core shaft, and is press-fitted into the shaft hole formed through the one member. A small diameter portion is formed that protrudes from the member and is loosely engaged with the other member, a circumferential groove is formed between the small diameter portion and the press-fit base, and a rubber crown is provided to cover the circumferential groove and the small diameter portion. A rubber sintered pin, characterized in that the rubber crown is sintered and fixed, and the outer diameter of the rubber crown is smaller than the outer diameter of the press-fit base.