JP2012237331A - Fitting/attachment method for annular metal component - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fitting method for an annular metal component which can prevent the generation of a flaw causing leakage when press-fitting the annular metal component 2 having a fitting cylinder 21 and a flange 22 into a prescribed attachment mating member 4, and to secure the seal performance of a metal fitting part.SOLUTION: When press-inserting the fitting cylinder 21 of the annular metal component 2 into the external peripheral face 4a of the attachment mating member 4 which is harder than the annular metal component, a press-insertion load is applied to the flange 22 extending from the rear end of the fitting cylinder 21 in the press-insertion direction in an inclined and deformed state that the flange 22 is made to fall down to the press-insertion direction by a jig 100.

Description

  The present invention relates to a method for fitting an annular metal part, in particular, an annular metal part having a fitting cylinder part and a flange part to a predetermined member by fitting.

  As a kind of sealing device that prevents foreign matter and muddy water from entering the machine from between the rotating side and the stationary side, as shown in FIG. 9, a non-rotating metal slinger 2 fitted on the rotating side is provided. Some have a structure in which a thrust strip 11 and a radial lip 12 provided in the sealing device body 1 are in sliding contact.

  Specifically, this sealing device includes a sealing device main body 1 attached to the inner peripheral surface 3a of the non-rotating outer peripheral member 3, and a metal slinger 2 attached to the inner peripheral member 4 on the rotating side, A thrust lip 11 provided in the apparatus main body 1 is slidably brought into close contact with the flange portion 22 of the slinger 2, and a radial lip 12 provided on the inner peripheral side of the thrust strip 11 is provided in the sealing apparatus main body 1. It is slidably in close contact with the outer peripheral surface of the fitting tube portion 21 of the slinger 2.

  That is, this type of sealing device uses the swing-off action by the centrifugal force of the flange portion 22 that rotates integrally with the inner peripheral member 4 in the intimate sliding portion of the flange portion 22 of the slinger 2 and the thrust strip 11, This prevents intrusion of dust, muddy water, etc. from the outside S1 into the inside S2. Further, even if muddy water or the like slightly enters from the intimate sliding portion of the flange portion 22 and the thrust strip 11 to the inner peripheral side thereof, these are intimately sliding portions of the fitting cylinder portion 21 of the slinger 2 and the radial lip 12. Since the further intrusion is blocked in FIG. 2, the thrust strip 11 is pushed back to the outer peripheral side by the swinging action of the flange portion 22 due to the centrifugal force.

  However, in this type of sealing device, the oils and fats enclosed in the in-machine S2 for the purpose of maintaining the soundness of the machine elements (for example, lubrication) are transferred between the fitting cylinder portion 21 of the slinger 2 and the inner peripheral member 4. There was a risk of leakage to the outside S1 through the metal fitting portion.

  Conventionally, the slinger 2 of this type of sealing device uses an annular pressing jig 5 having a flat pressing surface 5a orthogonal to the axis O as shown in FIG. The fitting cylinder portion 21 is press-fitted and fitted to the outer peripheral surface 4a of the inner peripheral member 4 by applying a uniform load in the direction, but the above-described leakage is caused by the fitting of the slinger 2 during the press-fitting process. The scratches caused by rubbing the inner peripheral surface 21a of the cylindrical portion 21 with the outer peripheral surface 4a of the inner peripheral member 4 that is harder than that become a through flow path, and the difference in atmospheric pressure between the outside S1 and the inside S2 is generated. This is thought to be caused by leakage pressure.

  Moreover, in order to solve such a problem, as disclosed in the following Patent Document 1, a sealing member (elastic member) is provided between the fitting cylinder portion 21 of the slinger 2 and the fitting portion of the inner peripheral member 4. However, in this case, the number of parts is increased by newly providing a sealing member, or a step of integrally molding the sealing material on the slinger 2 (fitting cylinder portion 21) is required. There is a problem of becoming.

JP 2001-215132 A

  The present invention has been made in view of the above points, and a technical problem thereof is that a ring metal part having a fitting cylinder part and a flange part, such as the above-described slinger, is attached to a predetermined mounting partner member. Provided is a method for fitting an annular metal part that can prevent the formation of a flaw that becomes a through-flow passage on the inner peripheral surface of the fitting cylinder part when press-fitting into the metal fitting part, and thus the sealing property of the metal fitting part Is to ensure.

  As a means for effectively solving the above technical problem, the fitting method of the annular metal part according to the invention of claim 1 is such that the fitting cylindrical portion of the annular metal part is harder than the annular metal part. When press-fitting to the outer peripheral surface of the mounting partner member, press-fit with the flange portion extending from the rear end of the fitting tube portion in the press-fitting direction so that the flange portion is inclined and deformed by a jig so as to fall in the press-fitting direction. It is characterized by applying a load.

  According to a second aspect of the present invention, there is provided a method for fitting and mounting an annular metal part according to the first aspect, wherein the jig has a stepped surface or an inclined surface that presses the flange portion in advance on the outer diameter side. It is characterized by having.

  The fitting and mounting method of the present invention includes the sliding of the inner peripheral surface of the fitting cylindrical portion of the annular metal part and the outer peripheral surface of the fitting member in the press-fitting process, and the inner peripheral surface of the fitting cylindrical portion after the press-fitting fitting. By providing close contact between the outer peripheral surfaces of the mounting mating members at different portions, a decrease in sealing performance due to scratches generated on the inner peripheral surface of the fitting cylindrical portion of the annular metal part during the press-fitting process is avoided.

  That is, when the fitting cylinder part of the annular metal part is press-fitted to the outer peripheral surface of the mounting member, the flange part extending from the rear end of the fitting cylinder part in the press-fitting direction is inclined and deformed so as to fall in the press-fitting direction. The fitting cylinder portion is pressed into the outer peripheral surface of the mounting counterpart member while being deformed so that the diameter of the fitting cylinder portion is slightly enlarged on the flange portion side. For this reason, the inner peripheral surface of the fitting cylinder part is damaged by rubbing against the outer peripheral surface of the annular metal part harder than the fitting cylinder part on the front end side in the press fitting direction of the fitting cylinder part. In the portion close to the (flange portion side), contact with the outer peripheral surface of the mounting counterpart member is not made, and the generation of scratches is effectively prevented. When the load in the press-fitting direction is released, the flange part and the fitting cylinder part spring back, so that the inner peripheral surface of the fitting cylinder part that is not damaged in the press-fitting process is brought into close contact with the outer peripheral face of the mounting member. The width increases.

  According to the method for fitting and mounting an annular metal component according to the present invention, the flange portion is inclined and deformed in the press-fitting direction in the process of press-fitting and fitting the fitting cylindrical portion of the annular metal component to the outer peripheral surface of the fitting member. Due to the expansion deformation of the fitting cylinder part, the occurrence of scratches on the inner peripheral surface of the fitting cylinder part is effectively prevented, so that after the press-fitting is completed, the fitting cylinder part and the metal fitting part of the mounting counterpart member are A good close state is obtained, and an excellent sealing property is secured.

It is explanatory drawing which shows the 1st form of the fitting mounting method of the cyclic | annular metal component which concerns on this invention. It is explanatory drawing which shows the effect | action by the 1st form of the fitting mounting method of the cyclic | annular metal component which concerns on this invention. It is explanatory drawing which shows the effect | action of the spring back by the 1st form of the fitting mounting method of the cyclic | annular metal component which concerns on this invention. It is explanatory drawing which shows the 2nd form of the fitting mounting method of the cyclic | annular metal component which concerns on this invention. It is a half sectional view which cuts and shows the jig used with the 2nd form of the fitting mounting method of the annular metal parts concerning the present invention by the plane which passes along the axis. It is explanatory drawing which shows the 3rd form of the fitting mounting method of the cyclic | annular metal component which concerns on this invention. To verify the effect of the fitting method of fitting an annular metal part according to the present invention, it is a graph showing the result of analyzing the change in the return amount S _B of the contact position by an angle θ of the flange portion of Hamagoji. In order to verify the effect | action by the fitting mounting method of the cyclic | annular metal component which concerns on this invention, it is a diagram which shows the result of having analyzed the change of the contact width B by the angle (theta) of the flange part at the time of a fitting. It is a half sectional view which cuts and shows the sealing device which has slinger as an annular metal part by the plane which passes along the axis. It is explanatory drawing which shows the fitting mounting method of the conventional cyclic | annular metal component.

  Hereinafter, a method for fitting and mounting an annular metal part according to the present invention will be described with reference to the drawings. FIG. 1 is an explanatory view showing a first embodiment of a method for fitting and mounting an annular metal part according to the present invention, and FIGS. 2 and 3 are explanatory views showing an operation according to the first embodiment.

  First, in FIG. 1, reference numeral 2 is a slinger used for the sealing device as shown in FIG. 9 described above, and corresponds to the annular metal part described in claim 1. The slinger 2 is made of a metal material such as stainless steel SUS304, and includes a fitting cylinder portion 21 and a flange portion 22 that is developed in a disk shape from one end of the fitting cylinder portion 21 via an R-shaped bent portion 23. Have A chamfer 24 is formed at the inner peripheral edge at the tip of the fitting cylinder portion 21.

  Reference numeral 4 denotes an inner peripheral member to which the slinger 2 is attached, and corresponds to the attachment counterpart member described in claim 1. The inner peripheral member 4 is made of a metal material harder than the slinger 2, and the outer peripheral surface 4a is formed in a cylindrical surface shape. The inner diameter of the fitting cylinder portion 21 of the slinger 2 is formed to be slightly smaller than the outer peripheral surface 4a of the inner peripheral member 4, that is, deformation stress is generated by the fitting, and the outer periphery of the inner peripheral member 4 is increased. A fitting allowance for tightening the surface 4a to obtain a required fixing force is provided.

  Reference numeral 100 is an annular jig used for press-fitting the fitting cylinder portion 21 of the slinger 2 to the outer peripheral surface 4 a of the inner peripheral member 4. The axial load necessary for press-fitting is applied to the slinger 2. The flange portion 22 is added to the flange portion 22 in a state where it is inclined and deformed so as to fall in the press-fitting direction, that is, the fitting tube portion 21 side. Therefore, the surface facing the flange portion 22 of the slinger 2 has an inner diameter. A conical surface 101 that is inclined so as to reduce the axial thickness of the jig 100 toward the side is formed. The conical surface 101 is set to have an angle α of −2 to −5 ° with respect to a plane orthogonal to the axis O.

  Accordingly, in the mounting operation of the slinger 2, the fitting cylinder portion 21 of the slinger 2 is press-fitted and fitted to the outer peripheral surface 4a of the inner peripheral member 4 which is a mounting counterpart member with the end portion where the chamfer 24 is formed at the head. At this time, when a load in the press-fitting direction (axial direction) is applied to the flange portion 22 extending from the rear end in the press-fitting direction of the fitting cylinder portion 21 by the jig 100, the conical surface 101 of the jig 100 The diameter portion 101a precedes and presses the outer diameter portion 22a of the flange portion 22. For this reason, when the press-fit load is unevenly applied to the outer diameter portion of the flange portion 22 and applied to the flange portion 22, as shown by a two-dot chain line in FIG. The part 22 is subjected to a conical inclined deformation in the −θ direction so as to fall in the press-fitting direction.

  Then, when the inclined deformation of the flange portion 22 due to the press-fitting load being unevenly applied to the outer diameter portion 22 a of the flange portion 22 increases, the inner diameter end portion of the flange portion 22, that is, the R-shaped bent portion 23 is adjacent. 2b, the bending angle in the −θ direction of the flange portion 22 corresponds to the inclination angle of the conical surface 101, as shown by the solid line in FIG. The angle to be controlled (-2 to -5 degrees).

  When the flange portion 22 of the slinger 2 is deformed into a conical shape as described above, the fitting tube portion 21 of the slinger 2 is also slightly expanded on the rear end side in the press-fitting direction, that is, the R-shaped bent portion 23 side. In response to deformation such as a diameter, it is press-fitted into the outer peripheral surface 4a of the inner peripheral member 4 in that state. In such a deformed state, the inner peripheral surface 21a of the fitting cylinder portion 21 is damaged by rubbing with the outer peripheral surface 4a of the inner peripheral member 4 that is harder than the fitting cylinder portion 21 at the front end side in the press-fitting direction. However, since the portion close to the end on the R-shaped bent portion 23 side is not in contact with the outer peripheral surface 4a of the inner peripheral member 4, occurrence of scratches due to press-fitting is effectively prevented.

  Next, when the press-fitting load on the flange portion 22 of the slinger 2 by the jig 100 is released at the time when the slinger 2 is press-fitted to a predetermined position, the flange portion 22 and the fitting tube portion 21 are spring-backed. Of the inner peripheral surface 21 a of the portion 21, a portion close to the end portion on the R-shaped bent portion 23 side, that is, a portion where generation of scratches is prevented in the press-fitting process is brought into close contact with the outer peripheral surface 4 a of the inner peripheral member 4. For this reason, the metal fitting part of the inner peripheral surface 21a of the fitting cylinder part 21 and the outer peripheral surface 4a of the inner peripheral member 4 will be in a favorable close contact state.

  In addition, at this time, the surface pressure of the fitting cylinder portion 21 to the outer peripheral surface 4a of the inner peripheral member 4 due to the spring back is higher on the R-shaped bent portion 23 side, and lower as the position is farther from the R-shaped bent portion 23. As shown by a broken line in FIG. 3, the fitting cylinder portion 21 is subjected to an inclined deformation such that the distal end side is lifted from the outer peripheral surface 4 a of the inner peripheral member 4, and the flange portion 22 is an original shape indicated by a two-dot chain line in FIG. 3. Furthermore, it is in a state of slightly tilting toward the + θ side (the side opposite to the direction of the inclined deformation of the flange portion 22 in the press-fitting process by the jig 100). For this reason, the end of the contact position between the inner peripheral surface 21a of the fitting cylinder portion 21 and the outer peripheral surface 4a of the inner peripheral member 4 moves to the R-shaped bent portion 23 side. The contact width of the portion of the surface 21a where the occurrence of scratches is prevented increases.

  Therefore, by attaching the slinger 2 of the sealing device shown in FIG. 9 described above to the inner peripheral member 4 by the above-described method, the inner peripheral member 4 and the metal fitting portion of the slinger 2 have a through-flow due to scratches. Since the path is not formed and the sealing performance is secured, the oils and fats sealed in the machine interior S2 for the purpose of maintaining the soundness of the machine elements (for example, lubrication) are connected to the fitting cylinder portion 21 of the slinger 2. It is possible to effectively prevent leakage to the outside S1 through the metal fitting portion of the inner peripheral member 4.

  Next, FIG. 4 is explanatory drawing which shows the 2nd form of the fitting mounting method of the cyclic | annular metal component which concerns on this invention, FIG. 5 passes the jig | tool 100 used by a 2nd form through the axial center O. FIG. It is a half sectional view cut and shown by a plane.

  That is, in this second embodiment, the surface of the jig 100 facing the flange portion 22 of the slinger 2 is formed in a stepped shape such that the axial thickness of the jig 100 is reduced on the inner diameter side. An annular first surface 102 facing the outer diameter portion 22a of the flange portion 22 of the slinger 2 and a second surface 104 formed so as to recede in the axial direction on the inner diameter side via an annular step surface 103. As shown in FIG. 5, an angle α formed by a virtual conical surface passing through the inner diameter edge 102a of the first surface 102 and the inner diameter edge 104a of the second surface 104 with respect to a plane orthogonal to the axis O is −2. It is set to ~ -5 °.

  Further, on the outer diameter side of the first surface 102, an annular protruding edge portion 105 is formed on which the outer diameter edge of the flange portion 22 of the slinger 2 can be loosely fitted.

  Therefore, in the mounting operation of the slinger 2 shown in FIG. 4, the fitting cylinder portion 21 of the slinger 2 is placed on the outer peripheral surface 4a of the inner peripheral member 4 which is the mounting counterpart member with the end portion where the chamfer 24 is formed at the head. When press-fitting and applying a load in the press-fitting direction (axial direction) to the flange portion 22 extending from the rear end in the press-fitting direction of the fitting cylinder portion 21 by the jig 100, the first surface of the jig 100 102 precedes and presses the outer diameter portion 22a of the flange portion 22. For this reason, when the press-fitting load is unevenly applied to the outer diameter portion 22a of the flange portion 22, the flange portion 22 having a plane perpendicular to the axis O as shown in FIG. It undergoes a conical bending deformation so that it falls in the direction.

  When the amount of inclined deformation of the flange portion 22 due to the press-fitting load being unevenly applied to the outer diameter portion 22a of the flange portion 22 increases, the inner diameter end portion of the flange portion 22, that is, the R-shaped bent portion 23 is increased. Since the adjacent end portion 22 b is pressed against the inner diameter portion of the second surface 104 of the jig 100, the inclination angle of the flange portion 22 is set so that the inner diameter edge 102 a of the first surface 102 and the inner diameter of the second surface 104. It is regulated to an angle (−2 to −5 °) substantially corresponding to the inclination angle α of the virtual conical surface passing through the edge 104a.

  In such a press-fitting process using the jig 100, the inner peripheral surface 21a of the fitting tube portion 21 is scratched by rubbing against the outer peripheral surface 4a of the inner peripheral member 4 at the front end side in the press-fitting direction, as in the first embodiment. However, since the portion close to the rear end side in the press-fitting direction, that is, the end portion on the R-shaped bent portion 23 side is not in contact with the outer peripheral surface 4a of the inner peripheral member 4, generation of scratches due to press-fitting is effectively prevented. The end of the contact position between the inner peripheral surface 21a of the fitting cylinder portion 21 and the outer peripheral surface 4a of the inner peripheral member 4 is not damaged by the press-fitting by the springback after the press-fitting load is released. As the contact width increases, the contact width increases.

  Further, if there is a misalignment between the slinger 2 and the jig 100, the flange portion 22 is not bent at the target bending angle, the bending becomes uneven in the circumferential direction, and the inner circumferential surface 21a of the fitting cylinder portion 21 is not bent. Although the scratch reduction effect may be impaired, according to the second embodiment, the slinger 2 is formed by loosely fitting the outer diameter edge of the flange portion 22 to the inner periphery of the annular protruding edge portion 105 of the jig 100. Since the misalignment of the jig 100 is prevented, the effect of reducing scratches is not impaired.

  In addition, as shown in FIG. 6 as a 3rd form, the cyclic | annular protruding edge part 105 makes the opposing surface with the flange part 22 of the slinger 2 in the jig | tool 100 the same conical surface 101 as the 1st form. It can also be applied to.

7, in order to verify the effect of the fitting method of fitting an annular metal part according to the present invention, the diagram showing a result of analyzing the change in the return amount S _B of the contact position by an angle θ of the flange portion of Hamagoji FIG. 8 is a diagram showing the result of analyzing the change in the contact width B due to the angle θ of the flange portion during fitting.

That is, this test is performed by changing the height of the step surface 103 between the first surface 102 and the second surface 104 in the jig 100 as shown in FIGS. The fitting cylinder portion 21 of the slinger 2 in a state in which the flange portion 22 of the slinger 2 is inclined and deformed by using a virtual conical surface having a different inclination angle α passing through the inner diameter edge 104a of the second surface 104a. press-fit to the outer peripheral surface 4a of the inner peripheral member 4, analyzes the return amount S _B and the contact width B of the contact position between the outer peripheral surface 4a of the inner peripheral member 4 by the spring-back during unloading after mating completion It is a thing.

The analysis conditions were as follows.
Inner diameter of fitting tube portion 21 of slinger 2: φ67.7
Outer diameter of fitting tube portion 21 of slinger 2: φ68.7
Axial length of the fitting tube portion 21 of the slinger 2: 3.5
Thickness of the flange portion 22 of the slinger 2: 0.6
Outer diameter of flange part 22 of slinger 2: φ79.9
Curvature radius of trough of R-shaped bent part 23 of slinger 2: 0.4
Angle of chamfer 24 of slinger 2: 45 °
Axial width of chamfer 24 of slinger 2: 0.35
Material properties of slinger 2: SUS304
(Yield stress: 210GPa Young's modulus: 197GPa Poisson's ratio: 0.3)
Outer diameter of inner peripheral member 4: φ67.8 (fitting allowance of fitting cylinder part 21: 0.05)
Angle of chamfer 4b of inner peripheral member 4: 45 °
Axial length of chamfered portion 4b of inner peripheral member 4: 0.5
Friction coefficient of metal fitting part: 0.15

Moreover, the contact width B here is the width of the region where the contact surface pressure with respect to the outer peripheral surface 4a of the inner peripheral member 4 is generated by the spring back when the press-fitting load to the flange portion 22 is removed after press-fitting. Detected as. Further, return amount S _B of the contact position, by unloading the press-fitting load, detected as the amount which the end of R-shaped bent portion 23 side moves to the R-shaped bent portion 23 side in a region where the contact surface pressure is generated did.

According to this analysis result, the maximum return amount S _B of the contact position in the tilt deformation angle θ is -4 ° flange portion 22 of the press-fitting of the slinger 2 by the jig 100, the inclination deformation angle θ is -3 The contact width B was maximum at −4 °. Therefore, it can be seen that the jig 100 for press-fitting the slinger 2 is preferably one that gives the flange portion 22 an inclined deformation of about −2 to −5 °, preferably about −3 to −4 °.

2 Slinger (ring metal parts)
21 Fitting cylinder part 22 Flange part 22a Outer diameter part 23 R-shaped bending part 4 Inner peripheral member (attachment partner member)
100 Jig 101 Conical surface 102 First surface 103 Step surface 104 Second surface 105 Annular rim

Claims (2)

  When the fitting cylindrical portion of the annular metal part is press-fitted to the outer peripheral surface of the mounting partner member that is harder than the annular metal part, the flange portion extends from the rear end in the press-fitting direction of the fitting cylindrical portion. A method for fitting and mounting an annular metal part, wherein a press-fitting load is applied in a state where the part is inclined and deformed so as to fall in the press-fitting direction by a jig.   The method for fitting and mounting an annular metal component according to claim 1, wherein the jig has a stepped surface or an inclined surface that presses the flange portion in advance on the outer diameter side.

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