JP5069773B2 - Lip type seal mounting structure - Google Patents

Description

  The present invention relates to a lip type seal which is a kind of sealing device, and more particularly to a mounting structure thereof. The lip type seal of the present invention is used, for example, as a water pump seal for a vehicle such as an automobile, or other general-purpose water pump seal.

  Conventionally, as shown in FIG. 3, a lip type seal 74 is known that is mounted on the inner periphery of a shaft hole 72 of a housing 71 and is slidably in close contact with the peripheral surface of a shaft 73 inserted through the shaft hole 72. However, the mounting structure to the inner periphery of the shaft hole 72 is a structure in which the outer peripheral surface of the seal 74 is directly fitted to the inner peripheral surface of the shaft hole 72. Accordingly, when used in a mounting location where the shaft diameter is the same but the shaft hole diameter is different, there is an inconvenience that a seal 74 having a different external diameter must be manufactured separately (see Patent Document 1). ).

  As another prior art related to the present invention, a sheet metal retainer attached to a housing such as a cylinder block of an engine, and an oil which is held by the sheet metal retainer and slidably comes into contact with a rotating member such as a crankshaft. Japanese Patent Application Laid-Open No. 2003-42304 discloses a sealing device having a seal, in which a sheet metal retainer and an oil seal are formed separately from each other, and the oil seal is fitted to the inner periphery of the sheet metal retainer. It is published in the gazette. However, in this prior art, the sheet metal retainer is provided for mounting the oil seal on the outer end surface of the housing, and in the present invention, the cartridge is provided for mounting the lip type seal on the inner periphery of the shaft hole. And has a different structure (see Patent Document 2).

JP-A-8-750008 JP 2003-42304 A

  In view of the above points, the present invention has been devised so that a lip type seal of the same specification can be used as it is even when used in a mounting location where the shaft diameter is the same but the shaft hole diameter is different. An object is to provide a mounting structure for a lip type seal.

In order to achieve the above object, the mounting structure according to claim 1 of the present invention is a lip type that is mounted on the inner periphery of a shaft hole provided in the housing and is slidably in close contact with the peripheral surface of the shaft inserted through the shaft hole. A seal is attached to the inner periphery of the shaft hole, and the lip type seal is attached to the inner periphery of the shaft hole via a cartridge disposed on the outer periphery thereof . The cartridge is composed of a combination of one lip seal member, a second lip seal member, a backup ring, and a retaining ring. The cartridge is integrated with a small-diameter cylindrical portion and a sealing fluid side end of the small-diameter cylindrical portion outward in the radial direction. An annular stepped portion formed, and a large-diameter cylindrical portion integrally formed at the outer peripheral end of the stepped portion toward the sealed fluid side, the stepped portion formed in an S-shaped or substantially S-shaped cross section The small-diameter cylindrical portion and the front Larger-diameter tubular portion is arranged to overlap partially in the axial direction, further, the outer peripheral surface of the large-diameter cylindrical portion with fitted the lip type seal to the inner peripheral surface of the small diameter cylinder portion of the housing axis It is fitted to the inner periphery of the hole.

Further, the mounting structure according to claim 2 of the present invention is the mounting structure of the lip type seal according to claim 1, wherein the above, the cartridge is at the sealed fluid side end portion of the large-diameter cylindrical portion, the cartridge the shaft which has an outward flange shaped engagement portion for defining an insertion depth when inserted into the hole together, the atmospheric air side end portion of the small diameter cylinder portion, when inserting the lip type seal to the cartridge an engagement portion of the inward flange-shaped to define the insertion depth together and when the cartridge is fitted to the Jikuananai peripheral surface at the outer peripheral surface of the large-diameter portion and it is characterized in that the are those set radial clearance between the outer peripheral surface and the Jikuananai circumferential surface of the small diameter cylinder portion.

Furthermore, the mounting structure according to claim 3 of the present invention is the mounting structure of the lip type seal according to claim 1 or 2, wherein the above, the cartridge, the the outer circumferential surface of the large diameter tubular portion, the shaft and the cartridge It has an outer peripheral seal made of an elastic film interposed between the inner peripheral surface of the hole and performing a sealing action.

  The mounting structure of the present invention having the above-described configuration is a structure in which a lip type seal is mounted on the inner periphery of the shaft hole via a cartridge arranged on the outer peripheral side thereof, and the cartridge has a large diameter through a step portion on a small diameter cylindrical portion. It has a stepped shape in which the cylindrical part is integrally molded, and a lip type seal is fitted to the inner peripheral surface of the small-diameter cylindrical part, and the outer peripheral surface of the large-diameter cylindrical part is fitted to the inner periphery of the shaft hole. It is structured. Therefore, when manufacturing the above cartridge, the lip type seal of the same specification is kept as it is by setting the diameter of the small-diameter cylinder part constant and setting the diameter of the large-diameter cylinder part according to the shaft hole diameter to be installed. The lip-type seal can be used on the inner periphery of shaft holes of various sizes. Therefore, as in the intended purpose of the present invention, the lip type seal of the same specification can be used as it is even when it is used at a mounting location with the same shaft diameter but different shaft hole diameter.

  Further, when an outward flange-like engagement portion is provided at the axial end portion of the large-diameter cylindrical portion of the cartridge, the engagement portion abuts against the outer end surface of the housing when the cartridge is inserted into the shaft hole. Thus, the insertion depth can always be regulated to a constant depth, and therefore the mounting workability can be improved.

  In addition, when an inward flange-like engagement portion is provided at the axial end of the small diameter cylindrical portion of the cartridge, the lip type seal is abutted against this engagement portion when the lip type seal is inserted into the cartridge. As a result, the insertion depth can always be regulated to a constant depth, so that the assembly workability can be improved.

  Further, when the cartridge is fitted to the inner peripheral surface of the shaft hole at the outer peripheral surface of the large diameter cylindrical portion, a radial gap of a predetermined size is provided between the outer peripheral surface of the small diameter cylindrical portion and the inner peripheral surface of the shaft hole. Therefore, this radial gap should be used effectively as a space for following the lip type seal against the eccentricity of the shaft or as a space for heat insulation that makes it difficult for heat to be transferred from the housing to the lip type seal. Can be considered.

  Further, since the axial length of the cartridge is set by the sum of the axial length of the small diameter cylindrical portion and the axial length of the large diameter cylindrical portion, there is a concern that the cartridge is slightly increased in size in the axial direction. When the stepped portion provided on the cartridge has an S-shaped or substantially S-shaped cross section and the small-diameter cylindrical portion and the large-diameter cylindrical portion are partially overlapped in the axial direction, the length of the cartridge in the axial direction is equivalent to the partial overlap. It is possible to shorten the length. Therefore, it is possible to provide a seal product having a structure that is compact in the axial direction even when the lip type seal is mounted via the cartridge.

  In addition, when an outer peripheral seal made of an elastic film is provided on the outer peripheral surface of the large-diameter cylindrical portion in the cartridge, the outer peripheral seal is interposed between the cartridge and the inner peripheral surface of the shaft hole, thereby providing a sealing action. This part sealability can be secured and improved.

The half-cut sectional view of the lip type seal provided with the mounting structure according to the first embodiment of the present invention Half cut sectional view of a lip type seal provided with a mounting structure according to a second embodiment of the present invention Half cut sectional view of a lip seal provided with a mounting structure according to a conventional example

  Next, embodiments of the present invention will be described with reference to the drawings.

First embodiment ...
FIG. 1 shows a mounting structure of a lip type seal 1 according to the first embodiment of the present invention, and the lip type seal 1 and the mounting structure are configured as follows. The lip seal 1 is used as a water pump seal for automobiles to seal cooling water. The right side of the figure is the cooling water or sealed fluid side A, and the left side of the figure is the atmosphere side B.

  That is, the lip type seal 1 is attached to the inner periphery of a shaft hole (bore) 72 of a housing (pump housing) 71 and is slidably in close contact with the peripheral surface of the shaft 73 inserted through the shaft hole 72. In this structure, the cartridge 51 is mounted on the inner periphery of the shaft hole 72 via the cartridge 51 arranged on the outer peripheral side.

  The lip type seal 1 is constituted by a combination of a first lip seal member 11, a second lip seal member 21 and a backup ring 31.

  The first lip seal member 11 is made of a predetermined rubber-like elastic body, and an annular radial portion 13 is integrally formed radially inward at the end of the cylindrical fluid 12 on the sealed fluid side. A seal lip (first seal lip) 14 is integrally formed at one end in the axial direction at the inner peripheral end of the first seal lip. On the inner peripheral surface of the lip end of the seal lip 14, a screw seal 15 that performs a pumping action is provided. Further, a metal reinforcing ring 16 is embedded in the wall thickness of the cylindrical portion 12 and the radial direction portion 13 (vulcanization adhesion), and the reinforcing ring 16 is the cylindrical portion 17 in the same manner as the first lip seal member 11. And the radial direction part 18 is integrated. Further, a caulking portion 19 for caulking and fixing the second lip seal member 21 and the backup ring 31 between the radial direction portions 13 and 18 is integrally formed at the atmospheric side end portion of the cylindrical portion 17 of the reinforcing ring 16. ing.

  The second lip seal member 21 is made of a predetermined resin material (PTFE or the like), and a seal lip (second seal lip) 23 is integrally formed on the inner peripheral end of the annular flat surface portion 22 in one axial direction. Yes.

  The backup ring 31 is made of a pressed metal plate, and an annular inward flange portion 33 is integrally formed radially inward at the end of the cylindrical portion 32 on the sealed fluid side. The latter flange portion 33 is integrally formed. Is a backup portion (holding portion) that directly backs up the second lip seal member 21.

  As shown in the figure, the second lip seal member 21 and the backup ring 31 are sequentially assembled on the inner peripheral side of the cylindrical portion 12 of the first lip seal member 11 and on the rear side of the radial direction portions 13, 18. Is bent, so that the three parts 11, 21, 31 are integrated.

  The lip type seal 1 composed of the combination of the three parts 11, 21, 31 can be directly fitted to the inner peripheral surface of the shaft hole 72. In the mounting structure, as described above, the cartridge 51 is interposed. To be fitted together.

  The cartridge 51 is configured as follows.

  That is, the cartridge 51 is made of a predetermined rigid material such as metal, for example, a pressed product of a metal plate, and has a small-diameter cylindrical portion 52. The small-diameter cylindrical portion 52 has a sealed fluid side end directed radially outward. An annular stepped portion 53 is integrally formed, and a large-diameter cylindrical portion 54 is integrally formed at the outer peripheral end portion of the stepped portion 53 toward the sealed fluid side A. As shown in the drawing, on the inner peripheral surface of the small-diameter cylindrical portion 52. The lip type seal 1 is fitted and the outer peripheral surface of the large diameter cylindrical portion 54 is fitted to the inner peripheral surface of the shaft hole 72.

  Further, when the cartridge 51 is manufactured, the diameter of the small-diameter cylindrical portion 52 is set to be constant, and the diameter of the large-diameter cylindrical portion 54 is set to match the shaft hole diameter to be mounted.

  Further, when the cartridge 51 is fitted to the inner peripheral surface of the shaft hole 72 at the outer peripheral surface of the large diameter cylindrical portion 54, the cartridge 51 is radially arranged between the outer peripheral surface of the small diameter cylindrical portion 52 and the inner peripheral surface of the shaft hole 72. The gap 55 is set.

  Further, an outward flange-like engagement portion 56 for defining an insertion depth when the cartridge 51 is inserted into the shaft hole 72 is integrated with the end of the large-diameter cylindrical portion 54 of the cartridge 51 on the sealed fluid side. Molded.

  Further, on the outer peripheral surface of the large-diameter cylindrical portion 54 of the cartridge 51, an outer peripheral seal 57 made of an elastic film that is interposed between the cartridge 51 and the inner peripheral surface of the shaft hole 72 and has a sealing action is provided over the entire periphery. Is attached.

  Further, an inward flange-like engaging portion 58 for integrally defining the insertion depth when the lip type seal 1 is inserted into the cartridge 51 is integrally formed at the atmosphere side end portion of the small diameter cylindrical portion 52 in the cartridge 51. Has been.

  The lip type seal 1 having the above-described configuration is characterized in that it has a plurality of seal lips 14 and 23 and exhibits an excellent sealing effect, and also exhibits the following operational effects with respect to its mounting structure.

  That is, the mounting structure having the above-described configuration is a structure in which the lip type seal 1 is mounted on the inner periphery of the shaft hole 72 via the cartridge 51 arranged on the outer peripheral side. The cartridge 51 is connected to the small diameter cylindrical portion 52 via the step portion 53. The large-diameter cylindrical portion 54 is integrally formed with a stepped shape. The lip type seal 1 is fitted to the inner peripheral surface of the small-diameter cylindrical portion 52 and the shaft hole 72 is formed on the outer peripheral surface of the large-diameter cylindrical portion 54. It is structured to be fitted to the inner periphery. Accordingly, when the cartridge 51 is manufactured, the lip type seal 1 having the same specification is set by setting the diameter of the small-diameter cylindrical portion 52 constant and setting the diameter of the large-diameter cylindrical portion 54 according to the shaft hole diameter to be mounted. The lip type seal 1 can be attached to the inner periphery of the shaft hole 72 of various sizes. Therefore, the lip type seal 1 having the same specification can be used as it is even when it is used at a mounting location where the shaft diameter is the same but the shaft hole diameter is different.

  Further, in the mounted state, a radial gap 55 of a predetermined size is set between the outer peripheral surface of the small diameter cylindrical portion 52 of the cartridge 51 and the inner peripheral surface of the shaft hole 72. It can be effectively used as a space for following the lip type seal 1 against the eccentricity of the shaft 73 or as a space for heat insulation that makes it difficult for heat to be transferred from the housing 71 to the lip type seal 1.

  In addition, since the outward flange-like engagement portion 56 is integrally formed with the end portion of the large-diameter cylindrical portion 54 of the cartridge 51 in the sealed fluid side, this engagement portion is inserted when the cartridge 51 is inserted into the shaft hole 72. By abutting 56 on the outer end face of the housing 71, the insertion depth can always be regulated to a constant depth. Therefore, the mounting work can be facilitated and the mounting workability can be improved.

  Further, since the outer peripheral seal 57 made of an elastic film is attached to the outer peripheral surface of the large-diameter cylindrical portion 54 in the cartridge 51, the outer peripheral seal 57 is interposed between the cartridge 51 and the inner peripheral surface of the shaft hole 72. To exert a sealing action. Therefore, the sealability of the part can be secured and improved.

  Further, since an inward flange-like engagement portion 58 is integrally formed at the atmosphere side end portion of the small diameter cylindrical portion 52 in the cartridge 51, the engagement portion 58 is inserted when the lip type seal 1 is inserted into the cartridge 51. By abutting the lip type seal 1 on the insertion depth, the insertion depth can always be regulated to a constant depth. Therefore, the assembling work can be facilitated and the assembling workability can be improved.

Second embodiment ...
FIG. 2 shows the mounting structure of the lip type seal 1 according to the second embodiment of the present invention, and the lip type seal 1 and the mounting structure are configured as follows. The lip seal 1 is used as a water pump seal for automobiles to seal cooling water. The right side of the figure is the cooling water or sealed fluid side A, and the left side of the figure is the atmosphere side B.

  That is, the lip type seal 1 is attached to the inner periphery of a shaft hole (bore) 72 of a housing (pump housing) 71 and is slidably in close contact with the peripheral surface of the shaft 73 inserted through the shaft hole 72. In this structure, the cartridge 51 is mounted on the inner periphery of the shaft hole 72 via the cartridge 51 arranged on the outer peripheral side.

  The lip type seal 1 includes a combination of a first lip seal member 11, a second lip seal member 21, a backup ring 31 and a holding ring 41.

  First of all, the holding ring 41 is made of a metal plate press product, and includes a cylindrical portion 42, a folded portion 43 provided continuously at an end portion of the tubular portion 42 on the sealing fluid side, and a folded portion 43. The inward flange portion 44 provided continuously and the crimping portion 45 provided at the atmospheric end of the tubular portion 42 are integrally provided, and the first flange portion 44 is interposed between the inward flange portion 44 and the crimping portion 45. The two-lip seal member 21 and the backup ring 31 are fixed by caulking.

  The second lip seal member 21 is made of a predetermined resin material (PTFE or the like), and is integrated with the inner peripheral end of the annular flat surface portion 22 so that the seal lip (second seal lip) 23 is inclined toward the sealed fluid side A. Molded.

  The backup ring 31 is made of a metal plate press like the holding ring 41 and is formed in an annular flat shape. Since this backup ring 31 is disposed further on the atmosphere side B of the second lip seal member 21, it performs a backup action on the second lip seal member 21.

  The first lip seal member 11 is made of a predetermined rubber-like elastic body, and has a cylindrical portion 12 disposed on the outer peripheral side of the cylindrical portion 42 of the retaining ring 41 and a radially inner portion from the end portion of the cylindrical portion 12 on the sealed fluid side. An annular radial portion 13 integrally formed toward the direction and a seal lip (first seal lip) 14 integrally formed at the inner peripheral end of the radial portion 13 are integrally provided. The seal lip 14 is formed so as to extend long to the sealing fluid side A, and a screw seal 15 that performs a pumping action is provided on the inner peripheral surface of the tip. An annular fitting groove 13a is provided on the atmosphere side end face of the radial portion 13 so as to open toward the atmosphere B, and the folded portion 43 of the holding ring 41 is fitted from the atmosphere side B into the fitting groove 13a. Yes. Further, an inward flange portion 20 is integrally formed at the end of the cylindrical portion 12 on the atmosphere side, and a holding ring 41 is fitted between the inward flange portion 20 and the radial portion 13 in a non-adhesive manner. Has been.

  The lip type seal 1 comprising a combination of the four parts 11, 21, 31, 41 can be directly fitted to the inner peripheral surface of the shaft hole 72. However, in the mounting structure, as described above, the cartridge 51 It is set as the structure fitted through.

  The cartridge 51 is configured as follows.

  That is, the cartridge 51 is made of a predetermined rigid material such as metal, for example, a pressed product of a metal plate, and has a small-diameter cylindrical portion 52. The small-diameter cylindrical portion 52 has a sealed fluid side end directed radially outward. An annular stepped portion 53 is integrally formed, and a large-diameter cylindrical portion 54 is integrally formed at the outer peripheral end portion of the stepped portion 53 toward the sealed fluid side A. As shown in the drawing, on the inner peripheral surface of the small-diameter cylindrical portion 52. The lip type seal 1 is fitted and the outer peripheral surface of the large diameter cylindrical portion 54 is fitted to the inner peripheral surface of the shaft hole 72.

  Although the step portion 53 in the first embodiment is formed in a plane perpendicular to the axis, in the second embodiment, the step portion 53 is formed in an S-shaped or substantially S-shaped cross section, thereby a small diameter cylinder. The part 52 and the large-diameter cylindrical part 54 are configured to be partially overlapped in the axial direction.

  Further, when the cartridge 51 is manufactured, the diameter of the small-diameter cylindrical portion 52 is set to be constant, and the diameter of the large-diameter cylindrical portion 54 is set to match the shaft hole diameter to be mounted.

  Further, when the cartridge 51 is fitted to the inner peripheral surface of the shaft hole 72 at the outer peripheral surface of the large diameter cylindrical portion 54, the cartridge 51 is radially arranged between the outer peripheral surface of the small diameter cylindrical portion 52 and the inner peripheral surface of the shaft hole 72. The gap 55 is set.

  Further, an outward flange-like engagement portion 56 for defining an insertion depth when the cartridge 51 is inserted into the shaft hole 72 is integrated with the end of the large-diameter cylindrical portion 54 of the cartridge 51 on the sealed fluid side. Molded.

  Further, on the outer peripheral surface of the large-diameter cylindrical portion 54 of the cartridge 51, an outer peripheral seal 57 made of an elastic film that is interposed between the cartridge 51 and the inner peripheral surface of the shaft hole 72 and has a sealing action is provided over the entire periphery. Is attached.

  Further, an inward flange-like engaging portion 58 for integrally defining the insertion depth when the lip type seal 1 is inserted into the cartridge 51 is integrally formed at the atmosphere side end portion of the small diameter cylindrical portion 52 in the cartridge 51. Has been.

  The lip type seal 1 having the above-described configuration is characterized in that it has a plurality of seal lips 14 and 23 and exhibits an excellent sealing effect, and also exhibits the following operational effects with respect to its mounting structure.

  That is, the mounting structure having the above-described configuration is a structure in which the lip type seal 1 is mounted on the inner periphery of the shaft hole 72 via the cartridge 51 arranged on the outer peripheral side. The cartridge 51 is connected to the small diameter cylindrical portion 52 via the step portion 53. The large-diameter cylindrical portion 54 is integrally formed with a stepped shape. The lip type seal 1 is fitted to the inner peripheral surface of the small-diameter cylindrical portion 52 and the shaft hole 72 is formed on the outer peripheral surface of the large-diameter cylindrical portion 54. It is structured to be fitted to the inner periphery. Accordingly, when the cartridge 51 is manufactured, the lip type seal 1 having the same specification is set by setting the diameter of the small-diameter cylindrical portion 52 constant and setting the diameter of the large-diameter cylindrical portion 54 according to the shaft hole diameter to be mounted. The lip type seal 1 can be attached to the inner periphery of the shaft hole 72 of various sizes. Therefore, the lip type seal 1 having the same specification can be used as it is even when it is used at a mounting location where the shaft diameter is the same but the shaft hole diameter is different.

  Further, in the mounted state, a radial gap 55 of a predetermined size is set between the outer peripheral surface of the small diameter cylindrical portion 52 of the cartridge 51 and the inner peripheral surface of the shaft hole 72. It can be effectively used as a space for following the lip type seal 1 against the eccentricity of the shaft 73 or as a space for heat insulation that makes it difficult for heat to be transferred from the housing 71 to the lip type seal 1.

  In addition, since the outward flange-like engagement portion 56 is integrally formed with the end portion of the large-diameter cylindrical portion 54 of the cartridge 51 in the sealed fluid side, this engagement portion is inserted when the cartridge 51 is inserted into the shaft hole 72. By abutting 56 on the outer end face of the housing 71, the insertion depth can always be regulated to a constant depth. Therefore, the mounting work can be facilitated and the mounting workability can be improved.

  Further, since the outer peripheral seal 57 made of an elastic film is attached to the outer peripheral surface of the large-diameter cylindrical portion 54 in the cartridge 51, the outer peripheral seal 57 is interposed between the cartridge 51 and the inner peripheral surface of the shaft hole 72. To exert a sealing action. Therefore, the sealability of the part can be secured and improved.

  Further, since an inward flange-like engagement portion 58 is integrally formed at the atmosphere side end portion of the small diameter cylindrical portion 52 in the cartridge 51, the engagement portion 58 is inserted when the lip type seal 1 is inserted into the cartridge 51. By abutting the lip type seal 1 on the insertion depth, the insertion depth can always be regulated to a constant depth. Therefore, the assembling work can be facilitated and the assembling workability can be improved.

  Furthermore, the stepped portion 53 of the cartridge 51 is formed in an S-shaped or substantially S-shaped cross section, whereby the small-diameter cylindrical portion 52 and the large-diameter cylindrical portion 54 are arranged so as to partially overlap in the axial direction. In addition, the axial length of the entire cartridge 51 is shortened by the amount of partial overlap. Therefore, even if it is a structure where the lip type seal 1 is mounted via the cartridge 51, it is possible to provide a seal product having a structure that is compact in the axial direction.

  In the above description, the structure of the lip type seal 1 is merely an example, and according to the present invention, lip type seals of various structures can be mounted on the housing via the cartridge.

DESCRIPTION OF SYMBOLS 1 Lip type seal 11 1st lip seal member 14,23 Seal lip 16 Reinforcement ring 19,45 Caulking part 21 Second lip seal member 31 Backup ring 41 Holding ring 51 Cartridge 52 Small diameter cylindrical part 53 Step part 54 Large diameter cylindrical part 55 Radial gap 56 Outward flange-like engagement portion 57 Outer peripheral seal 58 Inward flange-like engagement portion 71 Housing 72 Shaft hole 73 Shaft

Claims (3)

The lip type seal (1) is mounted on the inner periphery of the shaft hole (72) provided in the housing (71) and slidably comes into contact with the peripheral surface of the shaft (73) inserted through the shaft hole (72). The shaft hole (72) is mounted on the inner periphery,
The lip type seal (1) has a structure that is mounted on the inner periphery of the shaft hole (72) via a cartridge (51) disposed on the outer peripheral side thereof,
The lip type seal (1) is composed of a combination of a first lip seal member (11), a second lip seal member (21), a backup ring (31) and a retaining ring (41),
The cartridge (51) includes a small-diameter cylindrical portion (52), an annular step portion (53) integrally formed radially outward at the sealed fluid side end of the small-diameter cylindrical portion (52), A large-diameter cylindrical portion (54) integrally molded toward the sealed fluid side (A) at the outer peripheral end of the stepped portion (53);
The stepped portion (53) is formed in an S-shaped or substantially S-shaped cross section, and the small-diameter cylindrical portion (52) and the large-diameter cylindrical portion (54) are disposed so as to partially overlap in the axial direction.
Further, the lip type seal (1) is fitted to the inner peripheral surface of the small diameter cylindrical portion (52), and the outer peripheral surface of the large diameter cylindrical portion (54) is in the shaft hole (72) of the housing (71 ) . A lip type seal mounting structure characterized by being fitted around the circumference. In the mounting structure of the lip type seal according to claim 1,
Said cartridge (51), said sealed fluid side end portion of the large-diameter cylindrical portion (54), outwardly for defining the insertion depth when inserting the cartridge (51) in said shaft hole (72) and having a flange-like engagement portion (56) integrally, the atmospheric air side end portion of the small diameter cylinder portion (52), the insertion depth when the inserting the lip type seal (1) on the cartridge (51) has an inward flange shaped engagement portion for defining (58) together, and said axial hole (72) in the peripheral at the outer peripheral surface of the cartridge (51) is the large-diameter portion (54) when fitted to the surface, and characterized in that the set of radial clearance (55) between the outer peripheral surface and the axial hole (72) in the peripheral surface of the small diameter cylinder portion (52) Mounting structure for lip type seals. In the mounting structure of the lip type seal according to claim 1 or 2 ,
Said cartridge (51), the the outer circumferential surface of the large-diameter cylindrical portion (54), made of an elastic film which forms the interposed a seal acting between the said cartridge (51) said axial bore (72) in the peripheral surface A mounting structure for a lip type seal, comprising an outer peripheral seal (57) .

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