JP2020029941A - Seal mechanism for hydraulically fitted hub and seal auxiliary tool - Google Patents

Abstract

To provide a seal mechanism for a hydraulically fitted hub, capable of suppressing the leakage of pressure oil supplied between a mounting member and the hub from an axial end of each component.SOLUTION: The seal mechanism for suppressing the leakage of pressure oil supplied between a mounting member 51 and a hub 11 hydraulically fitted to the outer periphery side of the mounting member 51 includes an annular recessed part 16 provided in an end face 15 of the hub 11, an annular protruded part 17 provided on the inner periphery side of the recessed part 16 by providing the recessed part 16 in the end face of the hub 11, and a seal auxiliary tool 21 inserted into the recessed part 16 for pressing the protruded part 17 inward in the radial direction to plastically deform the protruded part 17. The hub 11 is used as a diaphragm coupling hub to be connected to a center tube via a diaphragm.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a seal mechanism and a sealing aid for a hydraulic fitting hub that suppresses leakage of pressure oil supplied between a mounting member and a hub that is hydraulically fitted to an outer peripheral side of the mounting member.

  Conventionally, for example, a diaphragm coupling 1 shown in FIG. 6 is known, and this diaphragm coupling 1 is connected to a center tube 41 from a hub 11 via a diaphragm 31, or conversely, from a center tube 41 via a diaphragm 31. A rotation torque transmission path connected to the hub 11 is provided.

  The hub 11 includes a hub body 12 having a cylindrical shape, and a flange portion 13 for holding the diaphragm 31 is integrally provided at one axial end of the hub body 12.

  Further, the hub 11 is connected to a mounting member 51 such as an output shaft or an input shaft inserted on the inner peripheral side.

  The connection between the mounting member 51 and the hub 11 is performed by so-called hydraulic fitting.

  That is, the hydraulic fitting is a method in which the mounting member 51 and the hub 11 are fitted using hydraulic pressure. When the mounting member 51 is fitted to the hub 11 or when the mounting member 51 is pulled out from the hub 11, the mounting is performed. By supplying pressure oil to a fitting surface between the member 51 and the hub 11 to expand the diameter of the hub 11, fitting and pulling out are possible.

  For this reason, the tapered surface 54 is provided on the outer peripheral surface of the mounting member 51 and the tapered surface 14 is provided on the inner peripheral surface of the hub 11 correspondingly. A supply path 55 for the pressure oil is provided inside the mounting member 51, and the supply path 55 is open to the outer peripheral surface of the mounting member 51. Therefore, when pressure oil is supplied from the supply path 55 to the fitting surface between the mounting member 51 and the hub 11 (arrow A), the diameter of the hub 11 is increased by hydraulic pressure, so that the mounting member 51 and the hub 11 can be fitted. The mounting member 51 can be pulled out from the hub 11.

JP 2010-185525 A

  However, according to the above-mentioned hydraulic fitting structure, the pressure oil supplied between the mounting member 51 and the hub 11 may leak from the axial end between the two components 11 and 51 (arrow B), and a large amount of the pressure oil is generated. If there is a leak, there is a concern that the diameter of the hub 11 is insufficient and the hydraulic fitting is not performed smoothly or the leaked pressure oil contaminates peripheral parts such as the diaphragm 31.

  The present invention has been made in view of the above points, and has the same structure as a seal mechanism for a hydraulic fitting hub that can suppress leakage of pressurized oil supplied between a mounting member and a hub from an axial end between both parts. It is an object to provide a seal auxiliary tool used for a mechanism.

  In order to solve the above problems, a seal mechanism for a hydraulic fitting hub according to the present invention is a seal mechanism that suppresses leakage of pressure oil supplied between a mounting member and a hub that is hydraulically fitted to an outer peripheral side of the mounting member. An annular concave portion provided on an end surface of the hub; an annular convex portion provided on an inner peripheral side of the concave portion by providing the concave portion on the end surface of the hub; A sealing aid that plastically deforms the convex portion by pressing the portion radially inward.

  Further, the seal auxiliary tool of the present invention is a seal auxiliary tool used in the above-described seal mechanism, and has a shape obtained by dividing an annular body having an insertion portion inserted into the concave portion into two pieces on a circumference, and dividing by two. The protrusion is pressed radially inward by bolting the bodies toward each other.

  Further, the seal auxiliary tool of the present invention is a seal auxiliary tool used in the seal mechanism described above, and has a shape in which an annular body having an insertion portion inserted into the concave portion is cut at one place on a circumference, The projections are pressed radially inward by bolting the cut ends of the cuts toward each other.

Further, the seal assisting device of the present invention is the seal assisting device described above, further comprising a pressure oil scattering prevention guard that receives pressure oil spouting from an axial end of a fitting surface between the mounting member and the hub. It is characterized by.

  Still further, in the seal mechanism of the present invention, in the seal mechanism described above, the hub is used as a diaphragm coupling hub connected to a center tube via a diaphragm.

  According to the present invention, the annular convex portion provided on the end face of the hub is plastically deformed by being pressed inward in the radial direction by the sealing aid, so that the convex portion forms a weir-like or lip-like seal portion. Is done. Therefore, it is possible to suppress a large amount of pressure oil supplied between the mounting member and the hub from leaking from the axial end portion between the two components, whereby the amount of expansion of the hub is insufficient and the hydraulic fit is smooth. The pressure oil that is not performed or leaks can be prevented from contaminating peripheral parts such as the diaphragm. In addition, since the seal assisting device has a pressure oil scattering prevention guard, the pressure oil spouting from the axial end of the fitting surface between the mounting member and the hub is received by the guard, and the pressure oil is prevented from being scattered. be able to.

Sectional view of a hydraulic fitting hub provided with a seal mechanism according to an embodiment. It is a figure which shows operation | movement of the sealing aid provided with the same sealing mechanism, (A) is sectional drawing of the state which inserted the sealing aid in the recessed part, (B) is the state in which the convex part was pressed by the sealing aid. Sectional view Side view of the sealing aid Side view showing another example of a sealing aid (A) and (B) are sectional views showing other examples of the insertion portion of the seal assisting tool Sectional view of a diaphragm coupling having a hydraulic fitting hub according to a conventional example

  As shown in FIG. 1, the hub 11 includes a hub body 12 having a cylindrical shape, and a flange portion 13 is integrally provided at one axial end (left side in the figure) of the hub body 12. The hub 11 is used, for example, as a diaphragm coupling hub connected to a center tube 41 (FIG. 6) via a diaphragm 31 (FIG. 6).

  The hub 11 is connected to a mounting member 51 such as an output shaft or an input shaft inserted on the inner peripheral side. Both the hub 11 and the mounting member 51 are metal parts.

  The connection between the mounting member 51 and the hub 11 is performed by hydraulic fitting.

  The hydraulic fitting is to fit the mounting member 51 and the hub 11 using hydraulic pressure, that is, when fitting the mounting member 51 to the hub 11 or when pulling out the mounting member 51 from the hub 11. By supplying pressure oil to the fitting surface between the mounting member 51 and the hub 11 to expand the diameter of the hub 11, fitting and pulling out are possible.

  For this reason, on the outer peripheral surface of the mounting member 51, a tapered surface 54 whose outer diameter dimension gradually increases from one axial side (flange side) to the other axial side (right side in the figure, opposite flange side) is provided. In addition, a tapered surface 14 is provided on the inner peripheral surface of the hub 11 so that the inner diameter gradually increases from one axial direction to the other axial direction. A supply path 55 for the pressure oil is provided inside the mounting member 51, and the supply path 55 is open to the outer peripheral surface of the mounting member 51. Therefore, when pressure oil is supplied from the supply path 55 to the fitting surface between the mounting member 51 and the hub 11 (arrow A), the diameter of the hub 11 is increased by hydraulic pressure at this time, so that the mounting member 51 and the hub 11 are fitted. The mounting member 51 can be pulled out from the hub 11. Since the mounting member 51 is provided with a tapered surface 54 on its outer peripheral surface, it may be referred to as a tapered shaft.

  In the hydraulic fitting structure having the above configuration, the pressure oil supplied between the mounting member 51 and the hub 11 may leak from one end in the axial direction of the two components 11, 51, and a large amount of the pressure oil leaks. When the hydraulic pressure is reduced, there is a concern that the diameter of the hub 11 is insufficient and the hydraulic fitting is not performed smoothly or the leaked pressure oil contaminates peripheral parts such as the diaphragm 31. Therefore, in this embodiment, a sealing mechanism for pressure oil as described below is provided.

  That is, as shown in an enlarged manner in FIG. 2, an annular concave portion 16 is provided on one end surface 15 of the hub 11 in the axial direction, and an annular convex portion 17 is provided on the inner peripheral side of the concave portion 16. The convex portion 17 is formed to have a greater axial length than its radial width.

  In addition, the sealing mechanism includes a sealing aid 21.

  The sealing aid 21 is inserted into the concave portion 16 as shown in FIG. 2A, and then the convex portion 17 is pressed inward in the radial direction as shown in FIG. For the purpose of plastic deformation, as shown in FIG. 3, an insertion portion 23 (see FIGS. 2A and 2B) to be inserted into the concave portion 16 is provided at the distal end, and a flange portion 24 for bolt fastening is provided. The annular body 22 provided on the outer peripheral portion has a shape obtained by dividing the circumference into two parts, and the insertion part 23 is reduced in diameter by tightening the divided bodies 22A and 22B by the combination of the bolt 25 and the nut 26 in a direction approaching each other. The convex portion 17 is pressed inward in the radial direction by the insertion portion 23 whose diameter is reduced, whereby the convex portion 17 is plastically deformed.

  As shown in FIG. 2 (B), the plastically deformed convex portion 17 is provided on its inner peripheral surface with a tapered portion 18 whose inner diameter is gradually reduced toward the convex portion tip 17a, and its outer peripheral surface. Is also provided with a tapered portion 19 which is inclined in the same direction, so that the entire convex portion 17 has a lip shape, and the tip 17a of the convex portion comes into contact with the outer peripheral surface of the mounting member 51 to seal against pressure oil. It is possible to operate as a weir-like or lip-like seal that exerts its function.

Since the tapered surface 14 is provided on the inner peripheral surface of the hub 11 as described above, the taper portion 18 provided on the inner peripheral surface of the convex portion 17 has its inclination angle θ _{1 set} to the inner peripheral surface of the hub 11. The inclination angle θ ₂ of the provided tapered surface 14 is formed to be larger than the inclination angle θ ₂ (θ ₁ > θ ₂ ), so that the convex portion 17 comes into contact with the outer peripheral surface of the mounting member 51 as a weir-like seal or lip-like seal. The magnitude of the contact pressure can be adjusted by the amount of tightening of the bolt 25.

  Further, as shown in FIG. 1, an inward flange-like pressure is formed on an inner peripheral portion of the seal assisting tool 21 to receive pressure oil jetted from an axial end of a fitting surface of the mounting member 51 and the hub 11. An oil scattering prevention guard 27 is provided integrally.

  According to the sealing mechanism having the above-described configuration, the annular convex portion 17 provided on the end face 15 of the hub 11 is plastically deformed by being pressed radially inward by the seal assisting tool 21. A weir or lip seal is formed. Therefore, it is possible to suppress a large amount of pressure oil supplied between the mounting member 51 and the hub 11 from leaking from the axial end portion between the two components 11 and 51, whereby the diameter expansion of the hub 11 is insufficient. As a result, it is possible to prevent the hydraulic fitting from being performed smoothly or to prevent the leaked pressure oil from contaminating peripheral parts such as the diaphragm.

  Further, since the pressure oil scattering prevention guard 27 is integrally provided on the inner peripheral portion of the seal assisting tool 21, the pressure oil ejected from the axial end of the fitting surface between the mounting member 51 and the hub 11 is subjected to this pressure. The oil scattering prevention guard 27 can receive the oil. Therefore, it is possible to suppress the pressure oil from scattering, and it is possible to suppress the scattering of the pressure oil from contaminating peripheral parts such as the diaphragm.

  In the above embodiment, the seal assisting tool 21 has a two-part structure that is divided into two parts on the circumference. However, the structure is not particularly limited as long as the protrusion 17 can be tightened.

  In FIG. 4, as an example, the seal assisting tool 21 has a shape in which the annular body 22 is cut at one place on the circumference (the cut portion is indicated by reference numeral 28), and the cut ends 28 a and 28 b are brought closer to each other. The insertion portion 23 (see FIGS. 2A and 2B) is reduced in diameter by tightening the bolts 25 and nuts 26 in combination, and the projection 17 is pressed radially inward by the insertion portion 23 whose diameter is reduced. Thereby, the convex portion 17 is plastically deformed.

  Further, as shown in FIG. 5 (A), the insertion portion 23 can be easily inserted into the recess 16 by providing a chamfered portion 29 on the inner periphery of the distal end as shown in FIG. Further, as shown in FIG. 5 (B), by providing the chamfered portion 29 and the pointed portion 30 on the inner periphery of the distal end, the insertion portion 23 can be easily inserted into the concave portion 16, and additionally, the peak value of tightening can be increased. Can be.

  Furthermore, the non-contact type convex portion 17 that is plastically deformed as described above forms a small radial gap with the outer peripheral surface of the mounting member 51 without contacting the outer peripheral surface of the mounting member 51. A seal may be formed. It is also conceivable to provide an annular groove, a stepped portion, an end surface, or the like, with which the protrusion tip 17a can be engaged on the outer peripheral surface of the mounting member 51.

DESCRIPTION OF SYMBOLS 1 Diaphragm coupling 11 Hub 12 Hub main body 13 Flange part 14, 54 Tapered surface 15 End surface 16 Concave part 17 Convex part 17a Convex tip 18, 19 Taper part 21 Sealing aid 22 Ring body 22A, 22B Split body 23 Insert part 24 Flange Part 25 Bolt 26 Nut 27 Pressure oil scattering prevention guard 28 Cut part 28a, 28b Cut end part 29 Chamfer part 30 Pointed end part 31 Diaphragm 41 Center tube 51 Mounting member 55 Pressure oil supply path

Claims (5)

A seal mechanism that suppresses leakage of pressurized oil supplied between a mounting member and a hub that is hydraulically fitted to an outer peripheral side of the mounting member,
An annular recess provided on the end face of the hub;
An annular convex portion provided on the inner peripheral side of the concave portion by providing the concave portion on the end surface of the hub,
A sealing mechanism for a hydraulic fitting hub, comprising: a sealing aid that is inserted into the concave portion and presses the convex portion radially inward to plastically deform the convex portion. It is a seal auxiliary tool used for the seal mechanism of Claim 1, Comprising:
It has a shape obtained by dividing an annular body having an insertion portion inserted into the concave portion on a circumference,
A sealing aid, wherein the projection is pressed inward in the radial direction by bolting the two divided bodies toward each other. It is a seal auxiliary tool used for the seal mechanism of Claim 1, Comprising:
The annular body having an insertion portion inserted into the concave portion has a shape cut at one place on the circumference,
A sealing aid, wherein the protrusions are pressed radially inward by bolting cut ends of the cuts in a direction to approach each other. It is a seal auxiliary tool of Claim 2 or 3, Comprising:
A sealing aid comprising a pressure oil scattering prevention guard for receiving pressure oil ejected from an axial end of a fitting surface between the mounting member and the hub. The seal mechanism according to claim 1,
A seal mechanism for a hydraulic fitting hub, wherein the hub is used as a diaphragm coupling hub connected to a center tube via a diaphragm.

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