JPH0130686Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a floating seal, and aims to provide a floating seal that has excellent lubrication of sliding surfaces.

[Conventional technology]

Conventionally, as shown in Fig. 3, opposing floating sheets d and e are respectively extrapolated onto the shaft a as a shaft sealing mechanism for relatively rotatably connecting the housing members b and c with which the shaft a communicates. The O-ring contact tapered surfaces f and g of the floating sheets d and e and the O-ring contact tapered surfaces h and i of the housing members b and c are respectively Rings j and k are airtightly interposed to form secondary seals B and C.
A structure is known in which the shaft a is sealed by forming the shaft a.

[Problem that the invention attempts to solve]

However, floating sheets d and e with the above configuration
In this case, when the level L of the lubricating oil O is equal to or lower than the inner diameter surface S of the floating sheets d and e, the lubricating oil is applied to the inside of the primary seal A formed by both the floating sheets d and e. This has caused problems such as insufficient or no supply of O, resulting in seizure and roughening of the sliding surface even at low speeds.

In view of the above problems, the present invention has been developed to reduce the lubricant O level L.
To provide a floating seal that maintains stable sealing performance by supplying lubricating oil O between the sliding surfaces of the primary seal part A even if the temperature is below the level of the inner diameter surface S of both floating sheets. purpose.

[Means for solving problems]

The floating seal of the present invention has an annular shape in which the outer peripheries of opposing floating sheets are supported on the housing side via secondary seal parts, forming a primary seal part that is slidably and airtightly abutted. In both of the floating seats, a lubricating oil communication hole is bored that communicates between the inner diameter position of the secondary seal part and the inner diameter position of the sliding surface, and the lubricating oil communication hole is located at a low position relative to the lubricating oil level. It was configured as follows.

[Effect]

In other words, in the floating seal, even if the lubricating oil level is lower than the inner diameter surface of the floating seat, the lubricating oil communication hole is configured at a position sufficiently lower than the inner diameter surface level, so that the lubricating oil communication hole The lubricating oil filled inside the secondary seal part is now introduced into the inner diameter side of the primary seal part, preventing depletion of lubricating oil between the sliding surfaces of both floating sheets and stabilizing the sliding surface. It acts as lubrication and cooling.

〔Example〕

An embodiment of the floating seal of the present invention will be described below with reference to FIGS. 1 and 2.

FIG. 1 is a front cross-sectional view of a floating seal, in which the shaft 1 is airtightly inserted into the shaft holes 4 and 5 of two housing members 2 and 3 that are arranged adjacent to each other in the axial direction and rotate relative to each other. It has a shaft-sealed structure. Reference numerals 6 and 6 designate annular floating sheets made of wear-resistant material, each having a tapered circumferential groove 7 on its outer periphery, the cross section of which is inclined to one side in the shape of an arc with a large curvature. , an annular sliding surface 9 perpendicular to the central axis is formed on the outer periphery of the tapered end surface 8 formed on the large diameter side of the floating sheet, and the small diameter side of the tapered circumferential groove 7 and the tapered end surface 8 slide together. One or more lubricating oil communication holes 10 communicating with the vicinity of the surface 9 are arranged around the inner diameter surface 11. Both floating sheets 6, 6 are formed at the ends of the housing members 2, 3 with sliding surfaces 9, 9 facing each other, and inner grooves 12 having arcuate cross sections slanting in opposite directions; The tapered circumferential grooves 7, 7 are airtightly supported on the inner grooves 12, 13 through O-rings 14, 14, and a secondary seal portion B, Configure C. Also, due to the elasticity of the O-rings 14, 14 interposed in the secondary seal portions B, C, and the diagonal orientation of the inner grooves 12, 13 and the tapered circumferential grooves 7, 7, both floating sheets 6, 6 slide, respectively. Pressed in the direction of the surfaces 9, 9, both sliding surfaces 9, 9
are brought into close contact to form the primary seal part A.

The floating seal having the above structure is used by filling the shaft holes 4 and 5 of the housing members 2 and 3, which are shaft-sealed by the primary seal part A and the secondary seal parts B and C, with lubricating oil O. The level L of the lubricating oil O may be at the same level as the inner diameter surface 11 of the floating seat 6, or may be at a slightly lower position. That is, the floating seal of the present invention has a structure in which the lubricating oil communication hole 10 is bored at a level lower than the inner diameter surface 11 of the floating sheet 6, and the lubricating oil O is conducted to the inner diameter part of the primary seal part A. Therefore, even if the level of the inner diameter surface 11 is higher than the level of the lubricating oil O, there is no fear that the lubricating oil in the primary seal portion A will run out.

Therefore, the primary seal portion A and the secondary seal portions B and C always exhibit stable lubrication, cooling, and anti-wear effects, and maintain the sealing effect.

[Effect of idea]

As described above, the floating seal of the present invention maintains the sealing effect without depleting the lubricating oil on the sliding surface even if the lubricating oil level drops, and it also has the basic structure of the conventional device. The present invention can be implemented without any modification, and the practical effects of the present invention are extremely large.

[Brief explanation of the drawing]

FIG. 1 is a front sectional view showing an embodiment of the floating seal of the present invention, FIG. 2 is a front sectional view of the same floating sheet, and FIG. 3 is a half-cut sectional view showing a conventional floating seal. 1... Shaft, 2, 3... Housing member,
6...Floating sheet, 7...Tapered circumferential groove, 8...Tapered end surface, 9...Sliding surface, 10...
Lubricating oil communication hole, 11... Inner diameter surface, 12, 13...
Inner groove, 14...O ring, A...primary seal part,
B, C... Secondary seal part, O... Lubricating oil.

Claims (1)

[Scope of utility model registration request] In the adjacent part of the housing member adjacent to each other in the axial direction,
In a floating seal formed by supporting opposing annular floating sheets via secondary seal parts and forming a primary seal part that is slidably and airtightly abutted, the second part of each of the floating sheets is A lubricating oil communication hole is formed by drilling and communicating between the inner diameter position of the secondary seal part and the inner diameter position of the sliding surface. A floating seal that is introduced on the inner diameter side.