JP2003336747A - Sealing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sealing device 1 which is integrally equipped with two sealing parts consisting of an oil seal 5 and a slipper seal 9, and finishes the machining of the housing at one place and the mounting work of the seal in one time in the sealing device 1 used for a gasoline direct injection pump or the like. <P>SOLUTION: A first mounting ring 4 metal-fitted to an inner peripheral surface of a shaft hole of the housing 2, the oil seal 5 mounted to the first mounting ring 4 and slidably contacted on the peripheral surface of the shaft 3, a projection 6 for sealing mounted on the first mounting ring 4 and pushed close to the end surface part 2b of the housing 2, a second mounting ring 7 metal-fitted to the first mounting ring 4, and the slipper seal 9 slidably close- contacting to the peripheral surface of the shaft 3 while being held between the first and the second mounting rings 4, 7 are integrally assembled. <P>COPYRIGHT: (C)2004,JPO

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealing device,
More specifically, the present invention relates to a sealing device provided with two seal portions including an oil seal and a slipper seal. 2. Description of the Related Art Conventionally, as a seal for high-pressure gasoline used in a gasoline direct injection pump or the like, 0.3 ± 0.1 MPa
Up to about a, a fluorine rubber oil seal is used, and when the pressure is further increased, polytetrafluoroethylene is used due to problems such as fatigue destruction due to a decrease in strength due to high swelling and wear due to high-speed sliding under an extremely small oil film. Fluoroethylene (PTF
E) slipper seals are used as gasoline side seals. In this case, regarding the installation of these seals, it is necessary to process two housings for the oil seal on the oil side and the slipper seal on the gasoline side and to perform the seal installation work twice in the pump assembly process. [0003] In view of the above, the present invention is provided with two seals integrally comprising an oil seal and a slipper seal. It is an object of the present invention to provide a sealing device that can be performed once. In order to achieve the above object, a sealing device according to the present invention comprises a first mounting ring metal-fitted to the inner periphery of a shaft hole of a housing, and the first mounting ring. An oil seal attached to the ring and slidably in contact with the peripheral surface of the shaft; a seal projection attached to the first attachment ring and abutting against and tightly contacting the end surface of the housing; A second mounting ring metal-fitted to the mounting ring, and a slipper seal held between the first and second mounting rings and slidably in close contact with the peripheral surface of the shaft. It is characterized by becoming. [0005] In the sealing device of the present invention having the above-described structure, the first mounting ring which is metal-fitted to the inner periphery of the shaft hole of the housing, and the first mounting ring is attached to the peripheral surface of the shaft. An oil seal slidably in contact with a second mounting ring metal-fitted to the first mounting ring, and slidably held on the peripheral surface of the shaft held between the first and second mounting rings. Since the slipper seals that are in close contact with each other are provided and are integrally combined, it is possible to realize a sealing device that integrally includes two seal portions including an oil seal and a slipper seal. A first metal mounting ring is metal-fitted to a metal housing (fitting between metal materials), and a second metal mounting ring is also used as a first mounting ring. Similarly, because of the metal fitting, it is possible to reduce the swelling portion in consideration of gasoline resistance. [0007] Further, since the sealing projection is provided on the first mounting ring and is in close contact with the end face of the housing, the first mounting ring made of metal is also made of a metal housing. Even when the first mounting ring and the housing are fitted with a metal, the sealing projection can effectively seal between the first mounting ring and the housing. The sealing device of the present invention having the above structure is used in the field of gasoline direct injection pumps, and is used in the field of equipment for sealing swelling fuel oil such as gasoline. [0009] The present application includes the following technical matters. That is, to achieve the above object, one sealing device proposed by the present application has the following contents. The oil seal and the slipper seal are integrated. An oil seal and a slipper seal are integrated with each other, and have an outer peripheral sealing function and a fixing function under high pressure. It is a direct injection seal in which an oil-side oil seal and a gasoline-side slipper seal are integrally combined. In addition, a direct injection seal in which an oil-side oil seal and a gasoline-side slipper seal are integrally combined is provided with an outer peripheral sealing function and a fixing function under high pressure. Embodiments are as follows.
That is, the first mounting ring is baked with an oil-side oil seal, and a metal fitting with an outer peripheral step is provided in order to have the function of the outer peripheral seal (rubber projection on the end face) and the function of fixing the seal. A slipper seal is incorporated on the inner peripheral side of the first mounting ring. The second mounting ring is for fixing the slipper seal,
Metal fitting to the first mounting ring. Since the combination seal itself receives a higher pressure than the gasoline side, it is structured to be received by the flange portion of the first mounting ring. When the first mounting ring is made of metal fitting, concentricity can be improved as compared with the case of rubber fitting, and a swelling portion (rubber portion) is reduced in consideration of gasoline resistance. Can be. The space between the housing and the housing is sealed by a sealing projection. If a step is provided on the outer periphery of the first mounting ring to abut against the housing at the time of mounting, the crushing allowance of the sealing projection can be adjusted by adjusting the axial position. According to the sealing device, it is possible to contribute to the simplification of the mating housing structure and the simplification of the process of assembling the seal. In addition, the housing processing and the structure for fixing the two separate seals at present. There is no need to divide parts, and the process of mounting two seals can be completed at once. Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a sealing device 1 according to an embodiment of the present invention.
2 shows a cross section in the mounted state. The sealing device 1 according to the present embodiment seals the space between the housing 2 and the shaft 3 in a gasoline direct injection pump, and is configured as follows. First, a first mounting ring 4 is provided on the inner periphery of a shaft hole of the housing 2 so as to be metal-fitted. A shaft (right end in the drawing) of the first mounting ring 4 An oil-side oil seal 5 slidably in contact with the peripheral surface of the housing 3 and a sealing projection 6 abutting against and intimately contacting an end surface formed in advance on the inner periphery of the shaft hole of the housing 2 are fixed. A second mounting ring 7 is metal-fitted on the inner periphery of the rear end (left end in the figure) of the first mounting ring 4, and is surrounded by the first and second mounting rings 4 and 7. A gasoline-side slipper seal 9 slidably in contact with the peripheral surface of the shaft 3 in an annular space 8
And a backup ring 10 for backing up the slipper seal 9. The first mounting ring 4 is formed in a ring shape from a predetermined metal material, and has a cylindrical portion (outer peripheral cylindrical portion) 4a on its outer peripheral portion. The front end of the outer peripheral cylindrical portion 4a is provided. An annular flat portion 4b is integrally formed with the portion toward the inside in the radial direction,
A relatively small-diameter cylindrical portion (inner cylindrical portion) 4c is integrally formed on the inner peripheral edge of the flat portion 4b toward the front end side, and is radially inwardly formed at the front end of the inner peripheral cylindrical portion 4c. An annular flange portion 4d is formed integrally with the flange portion. The first mounting ring 4 is metal-fitted to the inner periphery of the shaft hole of the housing 2 in the outer cylindrical portion 4a with a predetermined fitting margin. An axial mounting position with respect to the housing 2 is configured by axially abutting against an annular end surface portion (outer peripheral end surface portion) 2a formed in advance on the periphery. On the other hand, the inner peripheral cylindrical portion 4c is loosely inserted into the housing 2, and a radial gap 11 is formed between the cylindrical portion 4c and the housing 2. The oil seal 5 is formed in a ring shape from a predetermined rubber-like elastic body and has the first mounting ring 4.
And a seal lip 5a which is slidably adhered to the front end face of the flange portion 4d toward the front end side and slidably contacts the peripheral surface of the shaft 3. On the inner peripheral surface of the seal lip 5a, there are provided an annular main seal portion 5b and an auxiliary seal portion 5c which are slidably in close contact with the peripheral surface of the shaft 3, and are arranged side by side in the axial direction. A garter spring 12 is fitted in the garter spring. The seal projection 6 is formed in a ring shape by a predetermined rubber-like elastic body, and is attached to the front end face of the flange portion 4d of the first mounting ring 4 on the outer peripheral side of the oil seal 5 toward the front end side. The housing 2 is sealed by being abutted against an annular end face (inner end face) 2 b formed in advance on the inner periphery of the shaft hole of the housing 2. The seal protrusion 6 is formed integrally with the oil seal 5 via a connecting portion 13 provided on the inner peripheral side. In the case where the oil seal 5 and the seal protrusion 6 are formed integrally, , 5 and 6 are formed of the same type of rubber material. The second mounting ring 7 is formed in a ring shape from a predetermined metal material and has a cylindrical portion 7a on the outer periphery thereof, and has a radially inward portion at the front end of the cylindrical portion 7a. An annular flange portion 7b is formed integrally with the flange portion. In addition, the second mounting ring 7 is metal-fitted to the inner peripheral side of the outer cylindrical portion 4a of the first mounting ring 4 in the cylindrical portion 7a with a predetermined fitting margin. By assembling the flange portion 7b axially against the flat portion 4b of the first mounting ring 4 during assembly, the first metal ring 4
The axial mounting position with respect to is determined. The slipper seal 9 is formed in a ring shape from a predetermined resin material such as PTFE, and its outer diameter is adjusted to the inner diameter of each of the flange portions 4d and 7b of the first and second mounting rings 4 and 7. It is held in the space 8 by being formed larger. The slipper seal 9 is formed to have a substantially rectangular cross section, and a cylindrical sliding surface 9 a slidably contacting the peripheral surface of the shaft 3 is provided on the inner peripheral surface thereof. The backup ring 10 is formed in a ring shape from a predetermined rubber-like elastic body, and has a substantially circular cross section, and backs up the slipper seal 9 from the outer peripheral side. The housing 2 is formed of a predetermined metal material, and the end face 2 is formed on the inner periphery of the shaft hole.
a and 2b are formed in a step shape. The sealing device 1 having the above configuration seals gasoline and oil between the housing 2 and the shaft 3 in the gasoline direct injection pump as described above, and is characterized in that the above configuration has the following operational effects. have. That is, first, in the sealing device 1 having the above-described structure, the first mounting ring 4 to be metal-fitted to the inner periphery of the shaft hole of the housing 2 and the front end of the first mounting ring 4 An oil seal 5 for oil, which is baked and adhered and slidably adheres to the peripheral surface of the shaft 3; a second mounting ring 7 metal-fitted to the inner periphery of the rear end of the first mounting ring 4; And a gasoline slipper seal 9 which is held in the space 8 between the second mounting rings 4 and 7 and slidably contacts the peripheral surface of the shaft 3 so as to be integrated with each other. A sealing device 1 is integrally provided with two seal portions including an oil seal 5 for oil and a slipper seal 9 for gasoline. Therefore, the processing of the housing 2 can be completed at one place and the seal mounting operation can be completed only once. The first mounting ring 4 is metal-fitted to the inner periphery of the shaft hole of the housing 2, and the second mounting ring 7 is also metal-fitted to the inner periphery of the rear end of the first mounting ring 4. Therefore, it is possible to reduce the swelling portion in consideration of gasoline resistance. Therefore, the gasoline resistance and the durability associated therewith can be improved. Further, since the sealing projection 6 is provided, which is attached to the front end of the first mounting ring 4 by baking and is brought into close contact with the end face 2b of the housing 2, the first mounting ring 4 is provided. Even when the first fitting ring 4 is fitted into the inner periphery of the shaft hole of the housing 2,
And between the housings 2 can be effectively sealed. Therefore, in addition to the above gasoline resistance and durability, the sealing property can be improved. When manufacturing the first mounting ring 4,
By adjusting the axial length of the inner peripheral side cylindrical portion 4c, the axial distance between the flange portion 4d and the end surface portion 2b of the housing 2 can be adjusted.
The size of the crushing margin can be easily adjusted. Therefore, the size of the squeeze allowance of the sealing projection 6 can be easily adjusted as needed. The present invention has the following effects. That is, in the sealing device of the present invention having the above structure, the first mounting ring which is fitted to the inner periphery of the shaft hole of the housing with the metal, and the peripheral surface of the shaft which is mounted on the first mounting ring. An oil seal slidably in contact with the first mounting ring, a second mounting ring metal-fitted to the first mounting ring, and slidable on the peripheral surface of the shaft held between the first and second mounting rings. And a slipper seal, which is in close contact with the main body, and are integrally combined with each other, so that a sealing device integrally provided with two seal portions including an oil seal and a slipper seal is formed. Therefore, the housing processing can be completed at one place and the seal mounting operation can be performed only once, and a sealing device excellent in housing workability and seal mounting workability can be provided. Further, since the first mounting ring is metal-fitted to the housing and the second mounting ring is also metal-fitted to the first mounting ring, a swelling portion is provided in consideration of gasoline resistance. It is possible to keep it low. Therefore, it is possible to provide a sealing device excellent in gasoline resistance and durability associated therewith. Also, since the first mounting ring is provided with a sealing projection which is attached to the first mounting ring and is brought into close contact with the end face of the housing, the first mounting ring is metal-fitted to the housing. In this case, the sealing projection can effectively seal between the first mounting ring and the housing. Therefore, it is possible to provide a sealing device having excellent sealing properties in addition to the gasoline resistance and durability.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a half sectional view showing a mounted state of a sealing device according to an embodiment of the present invention [Description of References] 1 Sealing device 2 Housings 2a, 2b End face 3 Axis 4 First mounting Rings 4a, 4c, 7a Cylindrical part 4b Flat part 4d, 7b Flange part 5 Oil seal 5a Seal lip 5b Main seal part 5c Secondary seal part 6 Seal projection 7 Second mounting ring 8 Space 9 Slipper seal 9a Sliding surface 10 backup ring 11 gap 12 garter spring 13 connecting part

Claims (1)

Claims: 1. A first mounting ring (4) metal-fitted to the inner periphery of a shaft hole of a housing (2), and the first mounting ring (4).
And an oil seal (5) slidably in contact with the peripheral surface of the shaft (3) and an end surface (2b) of the housing (2) attached to the first mounting ring (4). A sealing projection (6) which is abutted and closely attached, and a second mounting ring (7) metal-fitted to the first mounting ring (4).
And a slipper seal (9) held between the first and second mounting rings (4) and (7) and slidably in close contact with the peripheral surface of the shaft (3). A sealing device.