JP2006300186A - Shaft sealing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To firmly assemble and fix a shaft sealing device even when a stepped fixing surface is not provided in a seal housing at the time of attachment of the shaft sealing device. <P>SOLUTION: This shaft sealing device is provided with a fitting ring 15 having a first fitting part 15A fitted to an end surface 60A of the seal housing 60, and a second fitting part 15B connected to a connection part 3B of a reinforcing ring 3; and a seal layer 20 made of a rubber-like elastic material is provided between connecting surfaces of the fitting ring 15 and the seal housing 60. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a shaft sealing device that seals off a sealed fluid in a gap between a rotating shaft mounted in a hole of a housing and the hole. In particular, the present invention relates to a shaft seal device that seals a sealed portion made of a rubber-like elastic material and a seal portion made of a resin material in parallel to seal a high-pressure, high-pressure sealed fluid.

  As a related technique related to the shaft seal device of the present invention, there is a preceding shaft seal device (see Patent Document 1). This shaft seal device is attached to a bearing mount around a rotary shaft that penetrates the wall of the pump housing to seal the sealed fluid. The sealed fluid is cooling water such as a radiator that flows into the pump housing and is pressurized during operation.

  The shaft seal device 100 is formed in a shape as shown in FIG. FIG. 5 is a cross-sectional view of one side of the shaft seal device 100. The shaft seal device 100 includes a first seal part 110 and a second seal part 120. The first seal portion 100 is made of an elastomer material having a T-shaped cross section. The first seal portion 110 includes a cylindrical first fitting portion 110B, a radial partition plate 110C, and a seal lip formed at the fork of the tip of the partition plate 11C. Then, the first seal lip 110A on the sealed fluid side L is fitted to the outer peripheral surface of the rotating shaft 150 so as to seal the sealed fluid. Further, the sealed fluid side of the first fitting portion 110 </ b> B is formed in the flange portion 110 </ b> F and is in contact with the end surface of the housing 160. Further, an annular groove is provided at the end of the fitting portion 110B opposite to the flange portion 110F. The first support plate 112 is fitted in the annular groove. The annular first support plate 112 supports the partition plate 110C when it receives the pressure of the sealed fluid.

  Further, the second seal portion 120 is disposed on the inner peripheral surface of the first fitting portion 110B. The second seal portion 120 has an L-shaped cross section, and the second fitting portion 120B is fitted to the first fitting portion 110B from the sealed fluid side. A second seal lip 120 </ b> A is provided that fits tightly with the rotating shaft 150 of the second seal portion 120. The second seal portion 120 is also supported by a second support portion 122 having an L-shaped cross section.

  In the shaft seal device 100 configured as described above, the entire first seal portion 110 and the second seal portion 120 are formed of an elastomer. With such an elastomer configuration, when the sealed fluid cools the radiator, the temperature of the sealed fluid becomes 120 ° C. or higher. For this reason, the elastomer of the 1st seal | sticker part 110 joined to the heated housing 160 deform | transforms with temperature. In particular, the housing 160 that is easily heated and the flange portion 110F that is in contact with the high-temperature sealed fluid are easily deformed, and the first seal portion 110 cannot be held in an accurate position. Moreover, since the 2nd seal part 120 is also fitted in the 1st seal part 110 made from an elastomer material, if the 1st seal part 110 deform | transforms, the mounting position of the 2nd seal part 120 will also become inaccurate. As a result, the shaft seal device 100 having such a configuration is not suitable for a high-temperature and high-pressure sealed fluid.

    FIG. 2 shows an oil seal sealing device 200 used for a bearing or the like (see Patent Document 2). The sealing device 200 is provided with a seal lip 201 at the inner peripheral end of the metal ring 210A. The seal lip 201 is provided with a seal surface 201A that fits the rotary shaft in a hermetically sealed manner. The seal surface 201 </ b> A is elastically tightened with respect to the rotation shaft by an annular spring 220. And the edge part of the metal ring 210 is formed in the flange part 210A. The flange portion 210A is difficult to process because the outer periphery of the metal ring 210 is formed by pressing toward the end many times. Therefore, the sealing device 200 is not suitable for mass production. Further, if the metal ring 210 is fitted into the hole of the housing 160, the sealed fluid may leak from the fitting between the metal ring 210 and the housing 160. Furthermore, a fluid to be sealed accumulates in the fitting ring between the metal ring 210 and the housing 160 and rust is generated in the metal ring 210. Furthermore, when the sealing device 200 is taken out from the hole of the housing 160 in order to repair the sealing device 200 or the like, it is difficult to directly take out the sealing device 200 made of only the press-fitted metal ring 210. Further, the sealing device 200 configured to provide the flange 210A on the metal ring 210 is limited to the case where one seal lip 201 is provided.

Japanese translation of PCT publication No. 2004-516439 (FIG. 3) No. 5-40362 (Fig. 1)

  The present invention has been made in view of the above-described problems, and a technical problem to be solved by the invention is that a shaft sealing device is fixed by a fixed plate even when a sealed fluid is high temperature and high pressure. Is to be able to be fixed to the through hole of the seal housing and to be able to hold the second seal portion. Another object of the present invention is to allow the shaft seal device to be easily removed from the through hole of the seal housing.

  The present invention has been made to solve the technical problems as described above, and the technical solution means is configured as follows.

    A shaft seal device according to a first aspect of the present invention is a shaft seal device that seals a sealed fluid between a hole of a seal housing and a shaft, and includes a fitting portion held on the seal housing side, and a fitting A rubber having a first seal lip that is integrally formed with the portion and whose inner peripheral surface is fitted to the outer peripheral surface of the shaft in a sealed manner to seal the fluid to be sealed, and a connecting portion that is formed integrally with the fitting portion. A first elastic seal member, a reinforcing ring which is integrally joined to the first seal lip and the connecting portion from the fitting portion and reinforced, and arranged in parallel opposite the sealed fluid side of the first seal portion. A second seal portion made of a resin material having a second seal lip that is held by the first seal portion and fits tightly with the shaft on the inner periphery, and a fitting portion that fits into a hole of the seal housing, and the seal housing A first engaging portion that engages with the end face and that is joined to the connecting portion of the reinforcing ring; Comprising a locking ring having an engagement portion, and has a sealing layer made of a rubber-like elastic material between the faces to be joined between the retaining ring and the seal housing.

  In the shaft seal device according to the second aspect of the present invention, the locking ring includes a first locking portion formed on the flange portion from one end of the fitting portion, and a second locking portion annularly formed from the other end of the fitting portion. It is formed on the inner peripheral portion and joined to the connecting portion of the reinforcing ring, and the thickness of the seal layer is formed to be smaller than the thickness of the fitting portion.

In the shaft seal device of the invention according to claim 3, the locking ring includes a first locking portion formed on the flange portion from one end of the fitting portion, and a second locking portion extending from the first locking portion and connected. And a second back plate for holding the second seal part at the other end of the fitting part, and the seal layer is formed with a thickness smaller than the thickness of the fitting part. It is what.

In the shaft seal device of the invention according to claim 4, the locking ring is formed on the annular plate, the first locking portion is provided on the outer peripheral portion, and is locked in the axial direction with the end surface of the seal housing. A stop part has in an inner peripheral part, and it connects with a connection part of a reinforcement ring, and holds a 2nd seal part via a connection part of a reinforcement ring.

  According to the shaft seal device of the present invention according to claim 1, the locking ring for holding the first seal portion on the seal housing is provided with the first locking portion for locking with the end face of the hole of the seal housing. Therefore, there is no need to provide a stepped locking surface for locking the shaft seal device to the seal housing in the axial direction. For this reason, it becomes possible to attach to the seal housing of any shape, such as when it is difficult to process the stepped locking surface in a suitable shape. At the same time, since the second locking portion is provided on the locking ring and can be connected to the connecting portion of the reinforcing ring to hold the second seal portion, the assembly structure is strong and the structure is simplified.

  In addition, a thin rubber-like elastic seal layer can be formed on the surface of the locking ring that joins the seal housing, so that the thin rubber layer allows the shaft seal device to be easily fitted into the hole of the seal housing. In addition, the rubber layer can effectively seal between the fitting between the seal housing and the locking ring. Further, if the rubber layer is bonded to the locking ring, welding or sag does not occur during heat or for a long time, so that it can be easily taken out from the seal housing. And this shaft seal device demonstrates durability by a locking ring, even if the fluid to be sealed is high pressure or high temperature.

  According to the shaft seal device of the invention according to claim 2, the fitting portion of the locking ring is fitted into the hole of the seal flange portion, and the flange portion provided at the end of the fitting portion of the locking ring is It can be locked to the end face of the seal housing. Furthermore, the 2nd latching | locking part provided in the other end of the fitting part can be connected with the connection part of a reinforcement ring. And while hold | maintaining the 1st seal part fitted to a locking ring, a 2nd seal part can be hold | maintained via a 1st backplate with the connection part of a reinforcement ring. For this reason, the shaft seal device can be fitted and fixed in the axial direction without providing a stepped portion in the hole of the seal housing. In addition, it is possible to connect the second locking portion of the locking ring and the connecting portion of the reinforcing ring and hold the second seal portion via the first back plate. For this reason, the assembly of the parts of the shaft seal device is strengthened, and the structure of the shaft seal device is simplified.

  According to the shaft seal device of the invention of claim 3, the flange portion of the locking ring is locked to the end surface of the seal housing, and the second locking portion is coupled to the connecting portion via the first locking portion. Then, the locking ring and the reinforcing ring are strongly connected. For this reason, a 1st seal part and a latching ring can be couple | bonded via a connection part. At the same time, the second back plate of the locking ring can directly support the second seal portion. For this reason, the first seal portion and the second seal portion can be directly connected.

  According to the shaft seal device of the invention according to claim 4, by connecting the connecting portion of the reinforcing ring of the first seal portion and the locking ring formed on the annular plate, the first outer periphery of the locking ring is connected. The locking part can be locked to the end face of the seal housing. At the same time, the second locking portion on the inner periphery of the annular plate can be connected to the reinforcing ring. And the connection part of a reinforcement ring hold | maintains a 2nd seal part via a 1st backplate. For this reason, even if the stepped portion is not provided in the hole of the seal housing, the shaft seal device can be fitted and fixed in the axial direction. For this reason, a 1st seal part and a 2nd seal part can be combined integrally. And the structure of a shaft seal device is assembled firmly. Further, the shaft seal device exhibits a pressure resistance capability.

  DESCRIPTION OF EMBODIMENTS Hereinafter, a shaft seal device according to an embodiment of the present invention will be described in detail with reference to the drawings. Each drawing described below is a design drawing in which the dimensional relationship is accurate.

  First, a first embodiment of the shaft seal device 1 according to the present invention will be described. FIG. 1 is a cross-sectional view of one side of the shaft seal device 1. 2 is a cross-sectional view of one side of the shaft seal device 1 of FIG. This will be described with reference to FIGS. The rotating shaft 50 is mounted in a bearing hole 60 </ b> B provided in the housing 60. The sealed fluid existing in the machine interior L between the hole 60B and the rotary shaft 50 is sealed by the shaft seal device 1. This sealed fluid is a coolant or the like. For example, when cooling a radiator etc., warm water is heated to 120 degreeC or more. At the same time, the pressure of the sealed fluid is 1 MPa or more.

  The first seal portion 2 includes a cylindrical fitting portion 2B, a first seal lip 2A extending in the inner diameter direction at one end of the fitting portion 2B, and a connection extending to the other end of the fitting portion 2B. Formed in the part 3B. The first seal surface 2A1 at the inner end of the first seal lip 2A is fitted and in close contact with the rotary shaft 50. Further, the fitting surface 2C, which is the outer periphery of the fitting portion 2B, is fitted and coupled with the fitting portion 15C of the locking ring 15. The first seal portion 2 is formed on the main body by molding a rubber material or a resin material that is elastically deformed like rubber. A reinforcing ring 3 is embedded in the main body to reinforce the fixed side of the main body. In other words, the reinforcing ring 3 embeds the fitting portion 15C in the fitting portion 2B and also has a flange-like reinforcing portion 3A for reinforcing the first seal lip 2A and a flange portion on the opposite side of the fitting portion 15C from the reinforcing portion 3A. Thus, the connecting portion 3B is reinforced. The connecting portion 3B includes a main body and a flange portion. However, in the case where the sealed fluid does not leak, only the flange portion can be used. The reinforcing ring 3 may be reinforced by bonding to the side surface of the main body as necessary. The material of the reinforcing ring 3 is a steel plate, an aluminum alloy, stainless steel, or the like. In addition, the material of the main body of the first seal portion 2 is fluoroelastomer, for example, ISO code FPM (trade name Viton), nitrile rubber, for example, ISO code HNBR (Servan), others, fluoro rubber, (FKM), perfluoro Elastomer (FFKM), silicone rubber (VMQ), ethylene propylene rubber (EPDM) and the like are suitable.

  The second seal portion 5 is formed in an annular plate, and the second seal lip 5A on the inner end side is bent from the outer peripheral side support portion 5B to the machine inner side L to form a bent portion. The support portion 5B is held in a joined state with the first seal lip 2A. The second seal portion 5 is made of a resin material. The second seal portion 5 can be made of a rubber-like elastic material, but preferably has a role of supporting the first seal lip 2A, so that it is preferably made of a hard material. The second seal portion 5 is disposed substantially in parallel with the first seal lip 2A. Then, as shown in FIG. 2, the second seal surface 5A1 on the inner periphery of the second seal lip 5A is fitted into the outer peripheral surface of the rotating shaft 50 in a cylindrical and long state. Further, the outer peripheral surface of the second seal lip 5A is disposed in the proximity of the inner peripheral surface of the first seal lip 2A. In this state, when the high pressure of the fluid to be sealed is directly applied to the first seal lip 2A, the second seal lip 5A supported by the second seal surface 5A1 fitted to the rotary shaft 50 is The seal lip 2A can be strongly supported.

  As for the 2nd seal | sticker part 5, the support part 5B supports from the back surface by the 1st backplate 10 in the state which the outer peripheral surface fitted to the inner peripheral surface of the fitting part 2B. The first back plate 10 has an L-shaped cross section and is an annular body. The first back plate 10 is provided with a seat portion 10B that supports the bent portion of the second seal lip 5A on the inner peripheral portion. Further, a pressing portion 10 </ b> A is provided at the other end of the cylindrical portion of the first back plate 10. Then, the pressing portion 10A is supported by the connecting portion 3B, and the support portion 5B of the second seal 5 is brought into close contact with the first seal lip 2A by the first back plate 10.

  The assembled first seal portion 2 and second seal portion 5 are fitted through the locking ring 15 when fitted into the hole 60 </ b> B of the seal housing 60. The locking ring 15 is formed in a fitting portion 15C that fits into the hole 60B, and a flange-shaped first locking portion 15A is formed at one end. The first locking portion 15 </ b> A is locked with the end surface 60 </ b> A of the hole 60 </ b> B in the seal housing 60. A second locking portion 15B is provided at the end of the fitting portion 15C opposite to the first locking portion 15A. This 2nd latching | locking part 15B is connected with the connection part 3B, and supports the press part 10A of the 1st backplate 10 by joining. Then, a rubber layer 20 having a thickness smaller than that of the fitting portion 15C is bonded to a surface of the locking ring 15 to be fitted with the hole 60B of the seal housing 60. The material of the locking ring 15 is steel, stainless steel, brass, aluminum, hard resin, or the like. The material of the rubber layer 20 is the same material as the main body of the first seal portion 2.

  When the shaft seal device 1 of the first embodiment formed in this way is attached to the hole 60B of the seal housing 60, a stepped portion for fitting the shaft seal device 1 into the hole 60B and fixing it in the axial direction is provided. Even if not, it can be easily held by the locking ring 15. Further, since the shaft sealing device 1 is provided with the first locking portion 15A, the shaft locking device 1 can be taken out from the hole 60B of the seal housing 60 by using the first locking portion 15A. That is, the first locking portion 15A (not shown) is provided with three equally spaced screws along the circumference, and the locking ring 15 can be extracted from the seal housing 60 by screwing a bolt into this screw. It becomes possible. Furthermore, if the 2nd latching | locking part 15B and the connection part 3B are connected in a joining state, there exists an effect that the 1st seal | sticker part 2 and the 2nd seal | sticker part 5 can be couple | bonded firmly with the coupling | bonding force of each component. A is the outside of the aircraft.

  Next, a shaft seal device 1 according to a second embodiment of the present invention will be described. FIG. 3 is a cross-sectional view of one side of the shaft seal device 1 according to the second embodiment. Also in FIG. 3, the hole 60B of the seal housing 60 does not have a stepped fixing surface for fixing the shaft sealing device 1 in the axial direction. In this shaft seal device 1, the difference from FIG. 1 is that the fitting portion 2B of the first seal portion 2 is opposite to the first seal lip 2A with respect to the fitting portion 2B of the shaft seal device 1 of FIG. It is formed on the outboard side A. Then, the connecting portion 3B is formed on the flange portion in the radial direction of the end surface 60A of the seal housing 60 from the fitting portion 2B. The connecting portion 3B is formed by a flange portion of the reinforcing ring 3 and a rubber material body around the flange portion. And the connection part 3B is pinched and connected between the 2nd locking part 15B extended from 15 A of 1st locking parts of the locking ring 15, and 15 A of 1st locking parts. Further, the locking ring 15 is provided with a second back plate 15D at the other end of the fitting portion 15C, and a seat portion 10B is formed at the inner end of the second back plate 15D. The second seal portion 5 is sandwiched and held between the first seal lip 2A by the seat portion 10B provided on the inner periphery of the second back plate 10D. Other configurations are substantially the same as those of the shaft seal device 1 of FIG.

  When the shaft sealing device 1 according to the second embodiment formed in this way is attached to the hole 60B of the seal housing 60, a stepped fixing surface for fitting the shaft sealing device 1 into the hole 60B and fixing the shaft sealing device 1 in the axial direction is provided. Even if it is not provided, it can be easily fixed by the locking ring 15. Moreover, if it takes out similarly to FIG. 1 from the hole 60B of the seal housing 60 using the 1st latching | locking part 15A, it can take out easily.

  Next, a shaft seal device 1 according to a third embodiment of the present invention will be described. FIG. 4 is a cross-sectional view of one side of the shaft seal device 1 according to the third embodiment. Also in FIG. 4, the step fixing surface for fixing the shaft sealing device 1 in the axial direction is not provided in the hole 60 </ b> B of the seal housing 60. The shaft seal device 1 is different from FIG. 1 in a modified embodiment in which the locking ring 15 and the reinforcing ring 3 are integrated. The reinforcing ring 3 has substantially the same shape as the reinforcing ring 3 in FIG. The locking ring 15 is formed on an annular plate and is integrated by spot welding the second locking portion 15B on the inner periphery to the reinforcing portion 3A. Alternatively, the locking ring 15 and the reinforcing fitting 3 can be integrated. The second seal portion 5B and the connecting portion 3B hold the second seal portion 5 in parallel with the first seal lip 2A via the first back plate 10. The outer peripheral side of the locking ring 15 is a first locking portion 15A. The first locking portion 15A covers the locking ring 15 with a rubber body and seals between the end surface 60A, but the joint surface with the seal housing 60 is the fitting surface of the fitting portion 2B made of rubber. Since it is sealed by 2C, the first locking portion 15A without rubber can be formed as shown in FIG. Other configurations are substantially the same as those of the shaft seal device 1 of FIG.

  In addition, the shaft seal device 1 of Example 2 and Example 3 will be in a state like FIG. 2 if the rotating shaft 50 is inserted. The second seal surface 5A1 is cylindrically fitted to the outer peripheral surface of the rotary shaft 50 and sealed, and when the first seal lip 2A receives the pressure of the fluid to be sealed, it is supported by the second seal lip 5A. The first locking portion 15 </ b> A of the locking ring 15 is locked to the end surface 60 </ b> A of the hole 60 </ b> B of the seal housing 60. In addition, the fitting portion 15C of the locking ring 15 is fitted in a seal with the hole 60B of the seal housing 60 via the rubber layer 20 having a smaller thickness than the fitting portion 15C. Furthermore, the 2nd latching | locking part 15B provided in the edge part of 15 C of fitting parts, and the connection part 3B of the reinforcement ring 3 are joined and connected, and it connects with the 2nd latching | locking part 15B via the 1st backplate 10. FIG. The first seal lip 2 </ b> A and the second seal portion 5 are sandwiched between them, and the second seal portion 5 is coupled and assembled in parallel with the first seal portion 2.

  As described above, the shaft seal device of the present invention can be locked in the axial direction even if the hole of the seal housing does not have a stepped fixing surface. As a result, it is a useful shaft seal device that can reduce the cost of processing the seal housing. Moreover, even if the hole of a seal housing is a small internal diameter, it is a useful shaft seal device that can be easily attached.

It is sectional drawing of the one side of the shaft seal apparatus concerning Example 1 of this invention. It is sectional drawing of the one side of the state which inserted the rotating shaft in the shaft seal apparatus of FIG. It is sectional drawing of the one side of the shaft seal apparatus concerning Example 2 of this invention. It is sectional drawing of the one side of the shaft seal apparatus concerning Example 3 of this invention. It is sectional drawing of the one side of the shaft seal apparatus which shows the technique relevant to this invention. It is a partial cross section figure of the one side of the oil seal which shows the technique relevant to this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Shaft seal apparatus 2 1st seal part 2A 1st seal lip 2B Fitting part 2C Fitting surface 3 Reinforcement ring 3A Reinforcement part 3B Connection part 5 2nd seal part 5A 2nd seal lip 5A1 2nd seal surface 10 1st back Plate 10A Pressing portion 10A1 Partition portion 10B Seat portion 15 Locking ring 15A Locking portion 15B Second back plate 15C Fixed portion 50 Axis (rotating shaft)
60 Seal housing 60A End face 60B Hole A Machine exterior L Machine interior

Claims (4)

A shaft seal device for sealing a sealed fluid between a hole of a seal housing and a shaft, the fitting portion being held on the seal housing side, and an inner peripheral surface formed integrally with the fitting portion. A first seal lip made of a rubber-like elastic material, having a first seal lip that seals and seals the fluid to be sealed with the outer peripheral surface of the first seal lip, and a connecting portion that is formed integrally with the fitting portion. A reinforcing ring that is integrally coupled and reinforced from the fitting portion to the first seal lip and the connecting portion, and arranged in parallel opposite to the sealed fluid side of the first seal portion, the first seal portion A second seal portion made of a resin material having a second seal lip that is fitted on the inner periphery of the seal housing, and a fitting portion that fits into the hole of the seal housing. A reinforcing ring having a first locking portion for locking to an end face; Wherein comprises a locking ring having a second locking portion for joining the connecting portion, the shaft seal device having a sealing layer made of a rubber-like elastic material between the faces to be joined with the seal housing and the locking ring. In the locking ring, the first locking portion is formed on the flange portion from one end of the fitting portion, and the second locking portion is formed on the annular inner peripheral portion from the other end of the fitting portion. 2. The shaft seal device according to claim 1, wherein the shaft seal device is joined to the connection portion of the reinforcing ring and has a thickness smaller than a thickness of the fitting portion. In the locking ring, the first locking part is formed on the flange part from one end of the fitting part, the second locking part extends from the first locking part and surrounds the connecting part, and is connected. And it has the 2nd back board which holds the 2nd seal part in the other end of the fitting part, and the thickness of the seal layer is formed in the dimension thinner than the thickness of the fitting part The shaft seal device according to claim 1. The locking ring is formed on an annular plate, the first locking portion is provided on the outer peripheral portion and locked in the axial direction with the end surface of the seal housing, and the second locking portion is provided on the inner peripheral portion. The shaft seal device according to claim 1, wherein the shaft seal device is connected to the connection portion of the reinforcement ring and holds the second seal portion via the connection portion of the reinforcement ring.

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