JP4092547B2 - Sealing device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a sealing device, and more particularly, to a sealing device having two seal portions including an oil seal and a slipper seal.
[0002]
[Prior art]
Conventionally, as a seal for high-pressure gasoline used in gasoline direct injection pumps and the like, an oil seal made of fluoro rubber is used up to about 0.3 ± 0.1 MPa, and under higher pressure conditions, (1) High swelling (2) Polytetrafluoroethylene (PTFE) slipper seals are used as gasoline side seals because of problems such as fatigue failure due to strength reduction due to strength and (2) wear associated with high-speed sliding under a very small oil film. In this case, with respect to the mounting of these seals, two housing processes for the oil seal on the oil side and the slipper seal on the gasoline side, and two seal mounting operations are required in the pump assembly process.
[0003]
[Problems to be solved by the invention]
In view of the above, the present invention provides a sealing device that is integrally provided with two seal portions including an oil seal and a slipper seal, so that the housing can be processed in one place and the seal mounting operation can be completed in one operation. The purpose is to do.
[0004]
[Means for Solving the Problems]
In order to achieve the above object, a sealing device of the present invention includes a first mounting ring that is metal-fitted to the inner periphery of a shaft hole of a housing, and a sliding member that is attached to the first mounting ring and that is attached to the peripheral surface of the shaft. An oil seal that is intimately contacted, a seal projection that is attached to the first mounting ring and is in contact with the inner peripheral end surface of the housing, and a metal fitting that is metal-fitted to the first mounting ring Two mounting rings and a slipper seal that is held between the first and second mounting rings and is slidably in close contact with the peripheral surface of the shaft, and the first mounting ring is An outer peripheral cylindrical portion, a flat portion integrally formed radially inward at the front end portion of the outer peripheral cylindrical portion, and an inner peripheral tube integrally formed toward the front end side at the inner peripheral edge portion of the flat portion. And a flange portion integrally formed radially inward at the front end portion of the inner peripheral cylindrical portion. In the outer peripheral cylindrical portion, the metal fitting is performed on the inner periphery of the shaft hole of the housing, and the axial mounting position with respect to the housing is positioned by abutting the flat surface portion against the outer peripheral end surface portion formed on the inner periphery of the shaft hole of the housing. The inner peripheral cylindrical portion is loosely inserted into the housing, and the oil seal and the sealing protrusion are bonded to the front end surface of the flange portion .
[0005]
In the sealing device of the present invention having the above-described configuration, the first mounting ring that is metal-fitted to the inner periphery of the shaft hole of the housing, and the first mounting ring that is attached to the first mounting ring and slidable on the peripheral surface of the shaft An oil seal that is in close contact with the first mounting ring, a second mounting ring that is metal-fitted to the first mounting ring, and a slipper that is slidably in contact with the peripheral surface of the shaft that is held between the first and second mounting rings Since a seal is provided and these are integrally combined, it is possible to realize a sealing device that is integrally provided with two seal portions including an oil seal and a slipper seal.
[0006]
In addition, the first metal mounting ring is similarly metal-fitted to the metal housing (fitting between metal members), and the second metal mounting ring is also metal-fitted to the first mounting ring. Therefore, it is possible to suppress the swelling portion in consideration of gasoline resistance.
[0007]
Further, since the seal projection is provided so as to be attached to the first mounting ring and in close contact with the end surface portion of the housing, the metal first mounting ring is also fitted into the metal housing. Even if they are combined, it is possible to effectively seal between the first mounting ring and the housing by the seal projection.
[0008]
The sealing device of the present invention having the above-described configuration is used in the field of gasoline direct injection pumps, and is used in the field of equipment that seals swollen fuel oil such as gasoline.
[0009]
The present application includes the following technical matters.
[0010]
That is, in order to achieve the above object, one sealing device proposed by the present application has the following contents.
(1) The oil seal and the slipper seal are integrated.
(2) The oil seal and the slipper seal are integrated, and the outer seal function and the fixing function under high pressure are provided.
(3) A direct-injection seal in which an oil-side oil seal and a gasoline-side slipper seal are combined together.
(4) Further , the direct-injection seal in which the oil-side oil seal and the gasoline-side slipper seal are integrally combined has an outer peripheral sealing function and a fixing function under high pressure.
[0011]
Embodiments are as follows.
That is, an oil-side oil seal is baked on the first mounting ring, and a metal fitting with an outer peripheral step is provided in order to have an outer peripheral seal function (end surface rubber protrusion) and a seal fixing function. A slipper seal is incorporated on the inner peripheral side of the first mounting ring. The second mounting ring is used for fixing the slipper seal and is metal-fitted to the first mounting ring. Since the combination seal itself receives a high pressure from the gasoline side, it is structured so as to be received by the flange portion of the first mounting ring.
[0012]
When the first mounting ring is made of metal fitting, the concentricity can be improved as compared with the case of rubber fitting, and the swelling portion (rubber portion) can be suppressed in consideration of gasoline resistance. The housing is sealed with a sealing projection. Further, if a step portion is provided on the outer periphery of the first mounting ring so as to abut against the housing at the time of mounting, the crushing allowance of the seal projection can be adjusted by adjusting the axial position thereof.
[0013]
According to the sealing device, it is possible to contribute to simplification of the mating housing structure and simplification of the seal assembling process, and processing of the housing for fixing two separate seals and division of structural parts. The process of attaching two seals can be completed at once.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings.
[0015]
FIG. 1 shows a cross-section in a mounted state of a sealing device 1 according to an embodiment of the present invention.
[0016]
The sealing device 1 according to the embodiment seals between the housing 2 and the shaft 3 in the gasoline direct injection pump, and is configured as follows.
[0017]
That is, first, a first mounting ring 4 that is metal-fitted to the inner periphery of the shaft hole of the housing 2 is provided, and a front end portion (right end portion in the figure) of the first mounting ring 4 is provided around the periphery of the shaft 3. An oil-side oil seal 5 that is slidably in contact with the surface and a seal projection 6 that is abutted against and closely contacted with an end surface portion 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 to the inner periphery of the rear end portion (left end portion 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 that is slidably in close contact with the peripheral surface of the shaft 3 and a backup ring 10 that backs up the slipper seal 9 are held in the annular space 8.
[0018]
The first mounting ring 4 is formed in an annular shape from a predetermined metal material and has a cylindrical portion (outer cylindrical portion) 4a on the outer peripheral portion thereof, and has a diameter at the front end portion of the outer peripheral cylindrical portion 4a. An annular flat surface portion 4b is integrally formed inwardly in the direction, and a relatively small diameter tubular portion (inner peripheral tubular portion) 4c is integrally formed on the inner peripheral edge portion of the flat surface portion 4b toward the front end side. An annular flange portion 4d is integrally formed at the front end portion of the inner peripheral cylindrical portion 4c inward in the radial direction. In addition, the first mounting ring 4 is metal-fitted with a predetermined fitting allowance to the inner periphery of the shaft hole of the housing 2 in the outer cylindrical portion 4a, and the flat portion 4b is placed in the shaft hole of the housing 2 during mounting work. An axial attachment position with respect to the housing 2 is positioned by abutting in an axial direction against an annular end surface portion (outer peripheral end surface portion) 2a formed in advance around the circumference. On the other hand, the inner peripheral cylindrical portion 4 c is loosely inserted into the housing 2, and a radial gap 11 is formed between the cylindrical portion 4 c and the housing 2.
[0019]
The oil seal 5 is formed in a ring shape by a predetermined rubber-like elastic body, and is baked and bonded to the front end surface of the flange portion 4d of the first mounting ring 4 toward the front end side. The seal lip 5a is slidably in close contact with the lip. On the inner peripheral surface of the seal lip 5a, an annular main seal portion 5b and a sub seal portion 5c that are slidably in close contact with the peripheral surface of the shaft 3 are provided side by side in the axial direction. A garter spring 12 is fitted to the.
[0020]
The seal projection 6 is formed into a ring shape by a predetermined rubber-like elastic body, and is baked and bonded to the front end surface 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 surface portion (inner peripheral end surface portion) 2b formed in advance on the inner periphery of the shaft hole of the housing 2. Further, the seal projection 6 is formed integrally with the oil seal 5 via the connecting portion 13 provided on the inner peripheral side. When the oil seal 5 and the seal projection 6 are formed integrally as described above, Both 5 and 6 are formed of the same kind of rubber material.
[0021]
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 peripheral portion thereof. The second mounting ring 7 has a ring shape radially inward at the front end portion of the cylindrical portion 7a. The flange portion 7b is integrally formed. The second mounting ring 7 is metal-fitted with a predetermined fitting margin on the inner peripheral side of the outer cylindrical portion 4a in the first mounting ring 4 in the cylindrical portion 7a, and in advance prior to mounting. The axial mounting position with respect to the first metal ring 4 is positioned by abutting the flange portion 7b against the flat surface portion 4b of the first mounting ring 4 in the axial direction during assembly.
[0022]
The slipper seal 9 is formed in a ring shape from a predetermined resin material such as PTFE, and its outer diameter is larger than the inner diameter of the flange portions 4d and 7b in the first and second mounting rings 4 and 7. By being formed, it is held in the space 8. The slipper seal 9 is formed to have a substantially rectangular cross section, and a cylindrical sliding surface 9 a that is slidably in close contact with the peripheral surface of the shaft 3 is provided on the inner peripheral surface thereof.
[0023]
The backup ring 10 is formed in a ring shape by a predetermined rubber-like elastic body, and its cross-sectional shape is formed in a substantially circular shape, and backs up the slipper seal 9 from the outer peripheral side.
[0024]
The housing 2 is formed of a predetermined metal material, and has the end surface portions 2a and 2b in a stepped shape on the inner periphery of the shaft hole.
[0025]
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 following effects are achieved by the above configuration. ing.
[0026]
That is, first of all, in the sealing device 1 configured as described above, the first mounting ring 4 that is metal-fitted to the inner periphery of the shaft hole of the housing 2 and the front end portion of the first mounting ring 4 are baked and bonded. And an oil seal 5 that is slidably in close contact with the peripheral surface of the shaft 3, a second mounting ring 7 that is metal-fitted to the inner periphery of the rear end of the first mounting ring 4, and the first and second A slipper seal 9 for gasoline that is held in the space 8 between the mounting rings 4 and 7 and that is slidably in close contact with the peripheral surface of the shaft 3 is provided, and these are integrally combined. A sealing device 1 is integrally provided with two seal portions including an oil seal 5 and a gasoline slipper seal 9. Therefore, the processing of the housing 2 can be completed at one place and the seal mounting operation can be completed at one time.
[0027]
In addition, since 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 portion of the first mounting ring 4. In consideration of gasoline resistance, it is possible to reduce the swelling portion. Therefore, it is possible to improve gasoline resistance and durability associated therewith.
[0028]
Further, since the seal projection 6 is provided which is baked and bonded to the front end portion of the first mounting ring 4 and is brought into close contact with the end surface portion 2 b of the housing 2, the first mounting ring 4 is attached to the housing 2. Even if it is metal-fitted to the inner periphery of the shaft hole, it is possible to effectively seal between the first mounting ring 4 and the housing 2 by the sealing projection 6. Therefore, in addition to the gasoline resistance and durability, the sealing property can be improved.
[0029]
Further, when the first mounting ring 4 is manufactured, the axial distance between the flange portion 4d and the end surface portion 2b of the housing 2 is adjusted by adjusting the axial length of the inner peripheral cylindrical portion 4c. Therefore, the size of the crushing allowance of the seal projection 6 can be easily adjusted. Therefore, the size of the crushing allowance of the seal projection 6 can be easily adjusted as necessary.
[0030]
【The invention's effect】
The present invention has the following effects.
[0031]
That is, in the sealing device of the present invention having the above-described configuration, the first mounting ring that is metal-fitted to the inner periphery of the shaft hole of the housing, and the first mounting ring that is mounted on the first mounting ring and slides on the peripheral surface of the shaft A freely sealable oil seal, a second mounting ring that is metal-fitted to the first mounting ring, and is held between the first and second mounting rings and is slidably in close contact with the peripheral surface of the shaft. Since a slipper seal is provided and these are combined together, a sealing device is integrally provided with two seal portions including an oil seal and a slipper seal. Therefore, the housing processing can be completed at one place and the seal mounting operation can be completed at one time, and a sealing device excellent in housing processing and seal mounting workability can be provided.
[0032]
In addition, 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, the portion that swells in consideration of gasoline resistance is minimized. Is possible. Therefore, it is possible to provide a sealing device having excellent gasoline resistance and durability associated therewith.
[0033]
The first mounting ring is metal-fitted to the housing because the sealing projection is provided so as to be attached to the first mounting ring and abut against the end surface portion of the housing. In addition, it is possible to effectively seal between the first mounting ring and the housing by the sealing projection. Therefore, it is possible to provide a sealing device having excellent sealing performance in addition to the above gasoline resistance and durability.
[Brief description of the drawings]
FIG. 1 is a half sectional view showing a mounting state of a sealing device according to an embodiment of the present invention.
DESCRIPTION OF SYMBOLS 1 Sealing device 2 Housing 2a, 2b End surface part 3 Shaft 4 1st mounting ring 4a, 4c, 7a Cylindrical part 4b Plane part 4d, 7b Flange part 5 Oil seal 5a Seal lip 5b Main seal part 5c Sub seal part 6 Seal Protrusion 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)

A first mounting ring (4) that is metal-fitted to the inner periphery of the shaft hole of the housing (2), and is attached to the first mounting ring (4) so as to be slidable on the peripheral surface of the shaft (3). An intimate oil seal (5), a sealing projection (6) attached to the first mounting ring (4) and abutted against the inner peripheral end surface portion (2b) of the housing (2), A second mounting ring (7) metal-fitted to the first mounting ring (4) and the shaft (3) held between the first and second mounting rings (4) and (7). become combined together and slidably closely to slipper seal the peripheral surface (9) of,
The first mounting ring (4) includes an outer peripheral cylindrical portion (4a), and a flat portion (4b) integrally formed radially inward at a front end portion of the outer peripheral cylindrical portion (4a), An inner peripheral cylindrical portion (4c) integrally formed on the inner peripheral edge portion of the flat surface portion (4b) toward the front end side, and a front end portion of the inner peripheral cylindrical portion (4c) toward the radially inner side. An integrally formed flange portion (4d), and the outer cylindrical portion (4a) is metal-fitted to the inner periphery of the shaft hole of the housing (2), and the flat portion (4b) is attached to the housing (2). The axial mounting position with respect to the housing (2) is positioned by abutting against the outer peripheral end surface portion (2a) formed in the inner periphery of the shaft hole, and the inner peripheral cylindrical portion (4c) is loosely inserted into the housing (2), The oil seal (5) and the sealing protrusion (6) are bonded to the front end surface of the flange portion (4d). Sealing apparatus characterized by there.

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