JP2005205558A - Oil seal press-in device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an oil seal press-in device for sufficiently and uniformly applying grease to a seal lip of an oil seal. <P>SOLUTION: This oil seal press-in device applies the grease by pressing the oil seal 70 having the seal lip 74 in an annular seal part 71, in an installation hole 63 formed in a housing 61 by a press-in tool 1. A seal fitting part 5 is projected in a top part 4 of a pressing part 3 formed in a pressing tool 1. A grease delivery hole 8 is opening in an outer peripheral surface 6 of the seal fitting part 5, and a seal lip abutting part 4b is formed in the top part 4 of the pressing part 3 along the outer peripheral surface 6 of the seal fitting part 5. An annular lip overturning preventive part 10 capable of abutting from the outer peripheral direction on the lip tip 74a of the seal lip 74, is projected along the outer periphery of this seal lip abutting part 4b. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an oil seal press-fitting device, and more particularly to an oil seal press-fitting device that applies grease to an oil seal.

  For example, an oil seal that seals a space between the rotary shaft and the housing is provided in a shaft hole of a housing that supports the rotary shaft in an automobile engine or suspension, and grease is applied to the oil seal.

  As an oil seal press-fitting device for press-fitting an oil seal into a shaft hole of a housing, an oil seal is press-fitted into a mounting portion formed in the housing by a press-fitting jig and grease is applied to the oil seal. ing. For example, as shown in FIG. 5, a press-fitting jig 55 for press-fitting an annular oil seal 51 into a mounting portion formed in a shaft hole of a housing has an inner peripheral surface 52 of the oil seal 51 at the tip of a cylindrical jig body 56. A cylindrical seal fitting portion 57 that can be fitted to the projection is provided. Further, a grease supply path 58 is formed along the axial direction inside the jig body 56, and a plurality of grease discharge holes 59 communicating with the grease supply path 58 are opened on the outer periphery of the seal fitting portion 57.

  The oil seal 51 is fitted and attached to the seal fitting portion 57 of the press-fitting jig 55 formed in this way, and the press-fitting jig 55 is moved forward in the axial direction by the extension of a cylinder (not shown) and the seal is fitted. The oil seal 51 mounted on the portion 57 is press-fitted into the mounting hole of the housing, and grease is pumped to the grease supply path 58 and discharged from the grease discharge hole 59 to be applied to the inner peripheral surface 52 of the oil seal 51. After that, it is known that the cylinder is contracted and the press-fitting jig 55 is retracted from the oil seal 51 mounted on the housing (see, for example, Patent Document 1).

  There is also an oil seal press-fitting device that has a seal lip extended to the annular seal part, presses an oil seal with a metal ring on the outer periphery of the seal part into the mounting hole of the housing, and applies grease to the seal lip. Are known. This type of oil seal press-fitting device will be described with reference to FIGS. 6 and 7 by taking as an example a case where an oil seal is press-fitted into a housing that supports an axle that is a rotating shaft in an automobile suspension device.

  FIG. 6 is an explanatory diagram showing an outline, and FIG. 7 is an explanatory diagram showing an operating state. 6 and 7, 61 is a housing, 65 is a bearing, 70 is an oil seal, and 81 is a press-fitting jig of an oil seal press-fitting device.

  The housing 61 is provided with a shaft hole 62 through which the axle passes, and a mounting hole 63 having a diameter larger than that of the shaft hole 62 and holding the bearing 65 and the oil seal 70 at the end of the shaft hole 62 via the step portion 64. It is formed on the same axis.

  The bearing 65 includes an outer race 66 that is press-fitted into a mounting hole 63 formed in the housing 61, an inner race 67 that holds the axle, and a plurality of rollers 65 that are arranged to be able to roll between the outer race 66 and the inner race 67. A ball 68 is provided.

  The oil seal 70 has an annular seal part 71 formed with an inner lip 73 projecting inwardly from the inner peripheral surface 72 and a base part formed continuously with the seal part 71 and gradually becomes conical as it moves to the lip tip 74a side. And a metal ring that holds the oil seal 70 in the housing 61 by press-fitting the inner edge 63a of the mounting hole 63 into the inner periphery 63a. 75. The metal ring 75 is annularly bent along the outer periphery of the inner end edge coupled to the seal portion 71, and can be brought into contact with the end surface of the outer race 66 of the bearing 65, and the bearing pressing portion 76. A cylindrical press-fit portion 77 that press-fits into the inner periphery 63 a of the mounting hole 63 formed in the housing 61 continuously to the outer periphery of the mounting hole 63, and the diameter of the mounting hole 63 is increased outward along the edge of the press-fit portion 77. A disc-shaped abutting portion 78 capable of abutting on the opening end portion 63b and a flange portion 79 formed in a cylindrical shape along the outer periphery of the abutting portion 78 are integrally formed.

  On the other hand, the press-fitting jig 81 of the oil seal press-fitting device has a cylindrical pressing part 83 in which the peripheral part 84a of the top part 84 can come into contact with the contact part 78 of the metal ring 75 at the tip of the substantially cylindrical jig main body 82. Is formed. A columnar seal fitting portion 85 is formed on the top portion 84 of the pressing portion 83 so that the tip end portion 86 a of the outer peripheral surface 86 can be annularly pressed against the inner lip 73 of the oil seal 70. Further, an annular seal lip abutting portion 84 b that can abut the lip tip 74 a of the seal lip 84 is formed on the top portion 84 of the pressing portion 83 along the outer peripheral surface 86 of the seal fitting portion 85. The jig body 82, the pressing portion 83, and the seal fitting portion 85 are continuously formed on the same axis.

  Further, a grease supply path 87 is formed in the jig main body 82 along the axial direction, and a plurality of grease discharge holes 88 are opened on the outer peripheral surface 86 of the seal fitting portion 85. It communicates with the supply path 87.

  In the oil seal press-fitting device formed as described above, the housing 61 is held by the housing holding part arranged coaxially with the press-fitting jig 81, and the bearing 65 is mounted on the opening end 63 b of the mounting hole 63 of the housing 61. Put. On the other hand, the inner lip 73 formed on the inner peripheral surface 72 of the oil seal 70 is fitted to the outer periphery of the distal end portion 86a of the outer peripheral surface 86 of the seal fitting portion 85 and pressed against the distal end of the press-fitting jig 81, and The seal tip 74 a of the seal lip 74 is pressed against a seal lip contact portion 84 b formed on the top portion 84 of the pressing portion 83 and the contact portion 78 of the metal ring 75 is contacted with the peripheral portion 84 a of the top portion 84 of the pressing portion 83. The oil seal 70 is attached.

  Next, a cylinder (not shown) is extended and a press-fitting jig 81 having an oil seal 70 attached to the tip is moved forward in the axial direction so that the bearing pressing portion 76 of the metal ring 75 of the oil seal 70 is moved to the outer race 66 of the bearing 65. Make contact. Further, the press-fitting jig 81 is moved forward to press-fit the bearing 65 into the mounting hole 63 until the outer race 66 comes into contact with the stepped portion 64 through the bearing pressing portion 76 formed on the metal ring 75 of the oil seal 70. Along with the press-fitting of the bearing 65, the press-fitting portion 77 of the metal ring 75 of the oil seal 70 is press-fitted into the mounting hole 63 until the abutting portion 78 abuts on the opening end 63b. The bearing 65 and the oil seal 70 are press-fitted into the mounting holes 63 at the intended positions.

  In a state where the bearing 65 and the oil seal 70 are press-fitted, grease is pumped from a grease pumping supply means (not shown) to the grease supply path 87 and opened to the outer peripheral surface 86 of the seal fitting portion 85 via the grease supply path 87. From the grease discharge hole 88, the outer peripheral surface 86 of the seal fitting portion 85 of the press-fitting jig 81, the top portion 84 of the pressing portion 83, the inner peripheral surface 72 of the oil seal 70, and the seal lip 74 are formed. The grease is applied to the inner peripheral surface of the seal lip 74 by discharging and filling a predetermined amount of grease.

  Thereafter, the cylinder is contracted, and the seal fitting portion 85 of the press-fitting jig 81 is extracted from the oil seal 70 and retracted from the bearing 65 and the oil seal 70 mounted on the housing 61.

Japanese Patent Laid-Open No. 10-43966

  According to the oil seal press-fitting device shown in FIGS. 6 and 7, the grease supply passage 87 and the grease discharge hole 88 for supplying grease to the press-fitting jig 81 for press-fitting the oil seal 70 into the housing 61 are formed. The oil seal 70 is press-fitted and attached to the housing 61, and grease can be applied to the seal lip 74 of the attached oil seal 70.

  However, from the grease discharge hole 88 into the space A formed by the outer peripheral surface 86 of the seal fitting portion 85 of the press-fitting jig 81, the top portion 84 of the pressing portion 83, the inner peripheral surface 72 of the oil seal 70, and the seal lip 74. When the grease is discharged and applied to the inner peripheral surface of the seal lip 74, the supply pressure of the grease G supplied from the grease discharge hole 88 into the space A as shown in FIG. The seal lip 74 is bent outward and the seal tip 74a of the seal lip 74 is separated from the seal lip abutting portion 84b formed on the top portion 84 of the pressing portion 83, and the grease G supplied to the space portion A from this gap. May leak out. Even if a predetermined amount of grease G is supplied from the grease discharge hole 88 to the intermediate portion A due to the outflow of the grease G, a predetermined amount of grease G cannot be secured in the space A, and the grease G is not sealed. There is a concern that quality may be deteriorated evenly.

  Accordingly, an object of the present invention made in view of such points is to provide an oil seal press-fitting device capable of sufficiently and uniformly applying grease to a seal lip of an oil seal.

  The invention of the oil seal press-fitting device according to claim 1, which achieves the above object, has an annular seal portion and an annular seal lip whose base portion is continuously formed in the seal portion and whose diameter is increased as it moves toward the lip tip side. In an oil seal press-fitting device that attaches an oil seal to a press-fitting jig, presses the oil seal into a mounting hole formed in the housing by the press-fitting jig, and applies grease to the oil seal, the press-fitting jig includes: A columnar jig body, a pressing portion provided at the tip of the jig body and having a top portion that presses the oil seal, and a projection protruding coaxially on the top portion of the pressing portion, and the sealing portion is fitted And a seal fitting portion having an outer peripheral surface in which a grease discharge hole is formed, and an oil seal formed on the top of the pressing portion along the outer peripheral surface of the seal fitting portion. A seal lip abutting portion with which the lip tip of the lip abuts, and a lip overturning that protrudes in an annular shape along the outer periphery of the seal lip abutting portion at the top of the pressing portion and abuts against the lip tip of the seal lip from the outer circumference direction And a section.

  An oil seal press-fitting device according to a second aspect of the present invention has an annular seal portion and an annular seal lip that has a base portion formed continuously in the seal portion and expands in diameter as it moves to the lip tip side, and has an inner edge. Is attached to the press-fitting jig with a metal ring having a cylindrical press-fitting part coupled to the seal part, and the oil seal is attached to the inner periphery of the mounting hole formed in the housing by the press-fitting jig. In the oil seal press-fitting device for press-fitting the press-fit part and applying grease to the oil seal, the press-fitting jig is provided at a columnar jig main body and a tip of the jig main body, and a peripheral part at the top is the above-mentioned A seal fitting that presses the contact portion of the oil seal and has an outer peripheral surface that is coaxially protruded from the top of the pressure portion and is fitted with the seal portion and has a grease discharge hole A seal lip abutting portion formed annularly at the top of the pressing portion along the outer peripheral surface of the seal fitting portion and abutting the tip of the lip of the oil seal, and a seal lip contact on the top of the pressing portion. A lip fall prevention portion is provided that protrudes in an annular shape along the outer periphery of the contact portion and contacts the lip tip of the seal lip from the outer periphery direction.

  According to a third aspect of the present invention, in the oil seal press-fitting device according to the first or second aspect, the lip fall prevention portion protrudes along the outer periphery of the seal lip contact portion formed in the pressing portion. It is a cylindrical part.

  According to a fourth aspect of the present invention, in the oil seal press-fitting device according to the first or second aspect, the lip fall prevention portion is arranged in an annular shape along the outer periphery of the seal lip contact portion formed in the pressing portion. It is characterized by being a plurality of protrusions protruding in the manner.

  According to the first aspect of the present invention, the annular lip fall prevention portion capable of coming into contact with the lip tip of the seal lip from the outer peripheral direction along the outer periphery of the seal lip contact portion at the top of the press portion formed in the pressing jig. By projecting, the seal lip is prevented from tilting due to the pressure of grease supplied from the grease discharge hole into the space formed between the outer peripheral surface of the seal fitting portion and the seal portion of the oil seal. The contact state between the tip of the lip and the seal lip contact portion is maintained and the leakage of grease from the portion is prevented, and the grease can be reliably applied to the seal lip in a sufficiently and uniformly stable state.

  According to the second aspect of the present invention, the outer periphery of the lip tip of the seal lip extends along the outer periphery of the seal lip contact portion to the top portion that presses the contact portion of the oil seal with the peripheral portion of the top portion of the pressing portion provided in the press-fitting jig. By projecting an annular lip fall prevention part that can contact from the direction, the pressure of the grease supplied from the grease discharge hole into the space between the outer peripheral surface of the seal fitting part and the seal part of the oil seal The tilting of the seal lip is prevented, the contact state between the lip tip of the seal lip and the seal lip contact portion is maintained, and the leakage of grease from the portion is prevented, and the grease is sufficiently and uniformly stabilized on the seal lip. Can be applied reliably in the state.

  According to invention of Claim 3, a lip fall prevention part can be comprised by the cylindrical part protruded along the outer periphery of the seal lip contact part formed in the press part.

  According to the invention of claim 4, the lip fall prevention portion can be formed by a plurality of protrusions that are arranged in a ring shape along the outer periphery of the seal lip contact portion.

  Hereinafter, an embodiment of an oil seal press-fitting device according to the present invention will be described with reference to FIGS. The housing and the oil seal have the same configuration as that of the housing 61 and the oil seal 70 shown in FIGS. 6 to 8, respectively. The parts corresponding to those in FIGS. Description is omitted.

  FIG. 1 is a perspective view showing an outline of a press-fitting jig 1 of an oil seal press-fitting device, FIG. 2 is an explanatory view showing an outline, and FIG. 3 is an explanatory view showing an operating state.

  As shown in FIGS. 1 and 2, the press-fitting jig 1 of the oil seal press-fitting device allows the peripheral edge 4 a of the top 4 to come into contact with the contact part 78 of the metal ring 75 at the tip of the substantially cylindrical jig body 2. A cylindrical pressing portion 3 is formed. The top portion 4 of the pressing portion 3 is formed with a cylindrical seal fitting portion 5 in which the tip portion 6 a of the outer peripheral surface 6 can be annularly pressed against the inner lip 73 of the oil seal 70. A grease supply path 7 is formed in the jig body 2 along the axial direction, and a plurality of grease discharge holes 8 are opened on the outer peripheral surface 6 of the seal fitting portion 5. 7 is communicated.

  Further, an annular seal lip abutting portion 4b with which the lip tip 74a of the seal lip 74 can abut is formed on the top portion 4 of the pressing portion 3 along the outer peripheral surface 6 of the seal fitting portion 5, and the seal lip contact A lip fall prevention portion 10 is formed along the outer periphery of the contact portion 4b. The lip fall prevention portion 10 can be brought into contact with the lip tip 74a of the seal lip 74 from the outer peripheral direction. The lip fall prevention portion 10 is formed by a cylindrical portion having a base end 11a on the outer periphery of the seal lip abutting portion 4b and having a conical inner peripheral surface 11 whose diameter increases as it moves to the distal end side. The jig body 2, the pressing portion 3, and the seal fitting portion 5 are continuously formed on the same axis.

  In the oil seal press-fitting device formed in this way, the housing 61 is held by a housing holding portion (not shown) disposed coaxially with the press-fitting jig 1, and a bearing 65 is provided at the opening end 63 b of the mounting hole 63 of the housing 61. Is placed.

  On the other hand, the seal tip 74 a of the seal lip 74 is brought into contact with the inner peripheral surface 11 of the lip fall prevention portion 10 formed on the top portion 4 of the pressing portion 3 and guided to the tip of the press-fitting jig 1. The inner lip 73 formed on the inner peripheral surface 72 is pressed against the outer peripheral surface 6 of the seal fitting portion 5, and the seal tip 74 a of the seal lip 74 is formed on the top portion 4 of the pressing portion 3. The oil seal 70 is brought into pressure contact with the seal lip contact portion 4b along the base end 11a of the inner peripheral surface 10 and the contact portion 78 of the metal ring 75 with the peripheral portion 4a of the top portion 4 of the pressing portion 3. Wear.

  Next, the press-fitting jig 1 having an oil seal 70 attached to the tip thereof is moved forward in the axial direction by extending a cylinder (not shown) so that the bearing pressing portion 76 of the metal ring 75 of the oil seal 70 contacts the outer race 66 of the bearing 65. Make contact. Further, the press-fitting jig 1 is moved forward, and the bearing 65 is press-fitted into the mounting hole 63 until the outer race 66 comes into contact with the stepped portion 64 via the bearing pressing portion 76 formed on the metal ring 75 of the oil seal 70. Along with the press-fitting of the bearing 65, the press-fitting portion 77 of the metal ring 75 of the oil seal 70 is press-fitted into the mounting hole 63 until the abutting portion 78 abuts on the opening end 63b, and as shown in FIG. The bearing 65 and the oil seal 70 are press-fitted into the mounting holes 63 at the intended positions.

  In a state where the bearing 65 and the oil seal 70 are press-fitted, grease is pumped from the grease pumping supply means (not shown) to the grease supply path 7 and opened to the outer peripheral surface 6 of the seal fitting portion 5 through the grease supply path 7. From the grease discharge hole 8 to the inside of the space A formed by the outer peripheral surface 6 of the seal fitting portion 5 of the press-fitting jig 1, the top 4 of the pressing portion 3, the inner peripheral surface 72 of the oil seal 70, and the seal lip 74. The grease is applied to the inner peripheral surface of the seal lip 74 by discharging and filling a predetermined amount of grease.

  When grease is discharged from the grease discharge hole 8 and applied to the inner peripheral surface of the seal lip 74, the supply pressure of grease supplied from the grease discharge hole 8 into the space A acts on the seal lip 74. As shown in FIG. 4, the seal lip 74 is supported by the lip fall prevention portion 10 to prevent tilting deformation such as bending deformation, and the lip tip 74a of the seal lip 74 is in contact with the seal lip contact portion 4b. The close contact state between the lip tip 74a of the lip 74 and the seal lip contact portion 4b is maintained, the grease G is prevented from leaking from the portion, and the expected amount supplied to the intermediate portion A from the grease discharge hole 8 Thus, a sufficient amount of grease G is evenly applied to the seal lip 74.

  Thereafter, the cylinder is contracted and the seal fitting portion 5 of the press-fitting jig 1 is extracted from the oil seal 70 and retracted from the bearing 65 and the oil seal 70 mounted on the housing 61.

  Therefore, according to this embodiment, the annular lip fall-preventing portion 10 that can contact the lip tip 74a of the seal lip 74 from the outer peripheral direction along the outer periphery of the seal lip contact portion 4b on the top portion 4 of the pressing portion 3 is provided. With the simple structure of projecting, the tilt of the seal lip 74 caused by the supply pressure of the grease G supplied from the grease discharge hole 8 into the space A is prevented by the lip fall prevention unit 10, and the lip tip of the seal lip 74 74a and the seal lip contact portion 4b are maintained in close contact with each other, so that a predetermined amount of grease G supplied from the grease discharge hole 8 to the intermediate portion A can be secured, and the grease G is sufficient and uniform on the seal lip 74. Can be reliably applied in a stable state. Moreover, it is a simple structure which protrudes and arrange | positions the cyclic | annular lip fall prevention part 10 in the top part 4 of the press part 3, It is not necessary to change an existing oil seal press-fitting device largely, and an existing oil press-fitting apparatus also has equipment cost. It can be executed without causing an increase.

  Note that the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the invention. For example, in the above-described embodiment, the lip fall prevention portion 10 is provided by the cylindrical portion that protrudes in an annular shape from the top portion 4 of the pressing portion 3, but a plurality of protrusions that protrude from the top portion 4 of the pressing portion 3 in an arc shape or the like are provided. The lip fall prevention part 10 can also be formed by arranging in an annular shape along the outer periphery of the seal contact part 4b. In the above-described embodiment, the oil seal 70 is press-fitted and installed in the mounting hole 63 of the housing 61 together with the bearing 65. However, the bearing 65 can be press-fitted and installed before the oil seal 70 is press-fitted. In the above embodiment, an example in which the oil seal is press-fitted into the housing of the suspension device has been described. However, the present invention can be applied to various oil press-fitting devices that press-fit an oil seal into another housing.

It is a principal part perspective view of the press-fitting jig | tool which shows the outline | summary of embodiment of the oil seal press-fitting apparatus in this invention. Similarly, it is explanatory drawing which shows the outline | summary of this Embodiment. Similarly, it is explanatory drawing which shows the operating state of an oil seal press-fitting device. Similarly, it is explanatory drawing which shows the operating state of an oil seal press-fitting device. It is explanatory drawing which shows the outline | summary of the conventional oil seal press-fitting apparatus. It is explanatory drawing which shows the outline | summary of the conventional oil seal press-fitting apparatus. Similarly, it is explanatory drawing which shows the operating state of an oil seal press-fitting device. Similarly, it is explanatory drawing which shows the operating state of an oil seal press-fitting device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Press-fit jig 2 Jig body 3 Press part 4 Top part 4a Peripheral part 4b Seal lip contact part 5 Seal fitting part 6 Outer peripheral surface 6a Tip part 7 Grease supply path 8 Grease discharge hole 10 Lip fall prevention part 61 Housing 62 Shaft Hole 63 Mounting hole 63a Inner circumference 70 Oil seal 71 Seal part 72 Inner circumference 73 Inner lip 74 Seal lip 74a Lip tip 75 Metal ring 76 Bearing pressing part 77 Press-fit part A Space part

Claims (4)

An oil seal having an annular seal portion and an annular seal lip having a base portion formed continuously on the seal portion and expanding in diameter as it moves to the lip tip side is attached to a press-fit jig, and the oil seal is attached to the press-fit jig. In the oil seal press-fitting device that press-fits into the mounting hole formed in the housing and applies grease to the oil seal,
The press-fitting jig is
A columnar jig body;
A pressing portion provided at the tip of the jig body and having a top for pressing the oil seal;
A seal fitting portion that is coaxially projected from the top of the pressing portion and has an outer peripheral surface on which the seal portion is fitted and a grease discharge hole is formed;
A seal lip contact portion that is formed in an annular shape at the top of the pressing portion along the outer peripheral surface of the seal fitting portion, and a lip tip of the oil seal contacts;
An oil seal press-fit comprising a lip fall prevention portion that protrudes in an annular shape along the outer periphery of the seal lip contact portion at the top of the pressing portion and contacts the lip tip of the seal lip from the outer peripheral direction. apparatus. An annular seal portion and an annular seal lip whose base portion is continuously formed on the seal portion and expands in diameter as it moves toward the lip tip side, and an inner end edge is coupled to the seal portion to form a cylindrical press-fit portion An oil seal having a metal ring is mounted on a press-fitting jig, and the press-fitting jig press-fits the press-fitting part into the inner periphery of a mounting hole formed in the housing by the press-fitting jig and applies grease to the oil seal. In the oil seal press-fitting device
The press-fitting jig is
A columnar jig body;
A pressing portion provided at the tip of the jig body, the peripheral portion of the top pressing the contact portion of the oil seal;
A seal fitting portion that is coaxially projected from the top of the pressing portion and has an outer peripheral surface on which the seal portion is fitted and a grease discharge hole is formed;
A seal lip contact portion that is formed in an annular shape at the top of the pressing portion along the outer peripheral surface of the seal fitting portion, and a lip tip of the oil seal contacts;
An oil seal press-fit comprising a lip fall prevention portion that protrudes in an annular shape along the outer periphery of the seal lip contact portion at the top of the pressing portion and contacts the lip tip of the seal lip from the outer peripheral direction. apparatus.   3. The oil seal press-fitting device according to claim 1, wherein the lip fall prevention portion is a cylindrical portion protruding along an outer periphery of the seal lip contact portion formed in the pressing portion. The said lip fall prevention part is a some protrusion protruded by being arranged cyclically | annularly along the outer periphery of the said seal lip contact part formed in the said press part. The oil seal press-fitting device described in 1.

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