JP2017227243A - Fixing structure of sealing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure sufficient fixing force to improve the reliability in a sealing device 1 which is fixedly fitted in a housing 2.SOLUTION: A sealing device 1 includes a reinforcement ring 11, an outer periphery seal part 12 which is provided integrally with the reinforcement ring 11 and closely contacts with and is fitted in an inner peripheral surface of a housing 2; and a main lip 13 which is placed in close contact with an outer peripheral surface of a shaft 3 inserted into an inner periphery of the housing 2 in a slidable manner. An engaged claw 11e protruding to the outer periphery side of the outer periphery seal part 12 is formed in the reinforcement ring 11, and the engaged claw 11e may be press-fitted in the inner peripheral surface of the housing 2 and may engage with an engagement groove 23 formed on the inner peripheral surface of the housing 2.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a fixing structure of a sealing device interposed between a housing and a shaft of a transmission of a motorcycle or other equipment, for example.

  Conventionally, a sealing device 100 as shown in FIG. 5 is known as means for sealing between a housing and a shaft inserted through the inner periphery thereof. The sealing device 100 includes a reinforcing ring 101 having a substantially L-shaped cross section cut along a plane passing through an axis O, and an outer peripheral seal formed integrally with a rubber-like elastic material on an outer diameter cylindrical portion of the reinforcing ring 101. And a main lip 103 and a dust lip 104 integrally formed of a rubber-like elastic material on an inner diameter portion of the reinforcing ring 101, and an outer peripheral seal portion 102 is formed at an opening end portion of the shaft hole 201 of the housing 200. In addition, the main lip 103 is slidably brought into close contact with the outer peripheral surface of the shaft 300 inserted through the shaft hole 201 of the housing 200, so that the lubricating oil on the machine A side is fixed. It is to seal the kind.

  When this type of sealing device 100 is used in a device that generates an internal pressure such as an automatic transmission or a transmission, the sealing device 100 does not fall off the mounting recess 202 of the housing 200 due to the internal pressure on the in-machine A side. Thus, it is necessary to ensure a large fitting and fixing force with respect to the mounting recess 202. For this reason, the mounting recess 202 has a substantially V-shaped cross-section cut along a plane passing through the axis O, and the side surface on the outside B side is relatively large with respect to the inner peripheral surface of the mounting recess 202. It is known to form a locking groove 203 that rises so that the outer peripheral seal portion 102 of the sealing device 100 that is press-fitted into the mounting recess 202 bites into the locking groove 203 (see, for example, the following prior art document). ).

JP-A-8-177868 (FIG. 2)

  However, the outer peripheral seal portion 102 made of a rubber-like elastic material has a reduced fitting and fixing force with respect to the mounting recess 202 of the housing 200 due to heat and stress relaxation over a long period of use, and the locking formed in the mounting recess 202. If the shoulder 203a on the outside B side in the groove 203 does not rise in an edge shape, the locking effect due to the biting of the outer peripheral seal portion 102 into the locking groove 203 is not sufficiently exerted, so the fitting fixing force is improved. Was demanded.

  The present invention has been made in view of the above points, and its technical problem is to secure a sufficient fixing force and improve reliability in a sealing device fitted and fixed to a housing. It is in.

  In order to solve the above-described technical problem, a fixing structure of a sealing device according to the invention of claim 1 includes a reinforcing ring and an outer periphery that is integrally provided with the reinforcing ring and is closely fitted to the inner peripheral surface of the housing. Engagement projecting to the outer peripheral side of the outer peripheral seal portion on the reinforcing ring of the sealing device comprising a seal portion and a main lip slidably in contact with the outer peripheral surface of the shaft inserted through the inner periphery of the housing A pawl is formed, and the pawl to be locked can be press-fitted into the inner peripheral surface of the housing and can be locked in an engaging groove formed in the inner peripheral surface of the housing. Is.

  According to a second aspect of the present invention, there is provided the sealing device fixing structure according to the first aspect, wherein the inner end of the outer end of the hooked claw and the outer side of the inner peripheral surface of the housing are provided. A taper surface having a small diameter on the inner side is formed at the end portion.

  According to a third aspect of the present invention, there is provided the sealing device fixing structure according to the first or second aspect, wherein the outer diameter end portion of the claw to be locked faces the outside of the machine and the inner peripheral surface of the housing. It is characterized in that it can be elastically deformed toward the inner diameter side during press-fitting.

  According to the fixing structure of the sealing device according to the present invention, when the sealing device is inserted into the inner periphery of the housing, the locked claws protruding to the outer peripheral side of the outer peripheral seal portion are press-fitted into the inner peripheral surface of the housing. Since a sufficient fixing force is ensured by being locked in the locking groove, it is possible to reliably prevent the sealing device from falling off due to an increase in internal pressure and improve reliability.

1 is a half sectional view showing a first embodiment of a sealing device fixing structure according to the present invention by cutting along a plane passing through an axis O; FIG. In the first embodiment of the fixing structure of the sealing device according to the present invention, FIG. In the first embodiment of the sealing device fixing structure according to the present invention, the press-fitting process of the sealing device into the housing is shown by a half cross-sectional view cut along a plane passing through the axis O. FIG. 6 is a half cross-sectional view showing a second embodiment of the sealing device fixing structure according to the present invention by cutting along a plane passing through an axis O; FIG. 10 is a half cross-sectional view showing an example of a fixing structure for a sealing device according to a conventional technique, cut along a plane passing through an axis O;

  Hereinafter, preferred embodiments of a fixing structure for a sealing device according to the present invention will be described with reference to the drawings. 1 to 3 show a first embodiment.

  In FIG. 1, reference numeral 2 is a housing of the device, and reference numeral 3 is a shaft inserted through a shaft hole 21 of the housing 2. As shown in FIG. 2, the sealing device 1 that seals the axial circumferential clearance between the housing 2 and the shaft 3 includes a metal reinforcing ring 11 and a rubber elastic body (rubber material or The outer peripheral seal portion 12, the main lip 13 and the dust lip 14 are integrally formed of a synthetic resin material having rubber-like elasticity.

  At the opening end of the shaft hole 21 of the housing 2, a mounting recess 22 having a diameter larger than that of the shaft hole 21 and for mounting the sealing device 1 is formed. Further, the axially intermediate portion of the inner peripheral surface of the mounting recess 22 has a substantially V-shaped cross section cut by a plane passing through the axis O, and the side surface 23a on the outside B side is the inner peripheral surface of the mounting recess 22 A locking groove 23 that rises substantially vertically is formed, and a tapered surface 24 having a small diameter on the machine A side is formed at the opening end of the mounting recess 22.

  As shown also in FIG. 2, the reinforcing ring 11 in the sealing device 1 is manufactured by punching and pressing a metal plate, and has a cylindrical portion 11a whose tip faces the in-machine A side, and this cylinder. U-shaped flange 11b extending from the end on the machine outside B side of the cylindrical portion 11a toward the inner diameter side, and a cross-sectional shape cut along a plane passing through the axis O from the inner diameter end of the inward flange 11b is convex toward the inner diameter side. A folded portion 11c that is folded to the outside B side in the shape of a letter, an outward flange 11d that extends from the folded portion 11c to the outer diameter side, and a locked portion formed at the outer diameter end of the outward flange 11d It consists of nails 11e.

  The outer peripheral seal portion 12 in the sealing device 1 is integrally vulcanized and bonded to the outer peripheral surface of the cylindrical portion 11a of the reinforcing ring 11 and the groove-shaped surface between the inward flange 11b, the folded portion 11c, and the outward flange 11d. The outer peripheral seal portion 12a and the outer peripheral seal portion 12b which is integrally vulcanized and bonded to the outer B side surface of the outward flange 11d of the reinforcing ring 11 are provided. The outer diameters of the inner peripheral seal portion 12a and the outer peripheral seal portion 12b are formed to be slightly larger than the inner peripheral surface of the mounting recess 22 of the housing 2, that is, appropriate for the inner peripheral surface of the mounting recess 22 A tight margin is set. Moreover, the recessed part 12c (refer FIG.2 and FIG.3) continued in the circumferential direction is formed in the edge part by the side of the outward flange 11d of the reinforcement ring 11 among the outer peripheral surfaces of the machine inner peripheral seal part 12a.

  The main lip 13 in the sealing device 1 extends from the position on the inner diameter side of the folded portion 11c of the reinforcing ring 11 into a conical cylinder shape having a small diameter on the machine A side, and the tip portion is slidably in close contact with the outer peripheral surface of the shaft 3. Is.

  The dust lip 14 in the sealing device 1 extends from the position on the inner diameter side of the folded portion 11c of the reinforcing ring 11 into a conical cylindrical shape having a small diameter on the side opposite to the main lip 13 (on the outside of the machine B). 3 is slidably in close contact with the outer peripheral surface.

  The locking claw 11e of the reinforcing ring 11 is located at a position corresponding to the locking groove 23 when the sealing device 1 is inserted into a predetermined axial position of the mounting recess 22 of the housing 2, and the outer peripheral side of the outer peripheral seal portion 12. That is, it protrudes from the space between the inner peripheral seal portion 12a and the outer peripheral seal portion 12b to the outer peripheral side, and the inner A side at the outer diameter end of the locked claw 11e has a smaller diameter. A tapered surface 11f is formed.

  Further, as shown in FIG. 3, the outward flange 11 d of the reinforcing ring 11 can be elastically deformed so as to fall in the axial direction, whereby the outer diameter end of the latching claw 11 e is attached to the mounting recess 22 of the housing 2. It is possible to press fit into the inner peripheral surface of the.

  In the above configuration, as shown in FIG. 1, the sealing device 1 presses the outer peripheral seal portion 12 into the mounting recess 22 of the housing 2 so that the main lip 13 faces the in-machine A side. The oil in the machine A leaks from the shaft circumference to the machine outside B side because the tip of the main lip 13 is slidably brought into contact with the outer circumference of the shaft 3 while being closely fitted to the inner circumference. The dust lip 14 is prevented from intruding dust and the like from the outside B by the tip of the dust lip 14 being slidably in contact with the outer peripheral surface of the shaft 3.

  When the sealing device 1 is mounted in the mounting recess 22 of the housing 2 as shown in FIG. 1, as shown in FIG. 3, the main lip 13 faces the in-machine A side, in other words, the cylinder of the reinforcing ring 11 The side surface on the outside B side of the seal is pressed toward the inside A side with, for example, the jig 4 so that the inboard side outer peripheral seal portion 12a of the shape portion 11a and the outer peripheral seal portion 12 faces the in-machine A side. Thus, the sealing device 1 is press-fitted into the mounting recess 22.

  At this time, in the sealing device 1, first, the machine-side outer peripheral seal portion 12 a of the outer peripheral seal portion 12 moves to the inner periphery of the mounting concave portion 22 of the housing 2 and the inner peripheral surface of the mounting concave portion 22 and the cylindrical portion 11 a of the reinforcing ring 11. It is press-fitted while being compressed in the radial direction between the outer peripheral surface. And the taper surface 11f formed in the to-be-latched claw 11e which protruded from the outer periphery seal part 12 to the outer periphery side eventually interferes with the taper surface 24 formed in the opening end part of the mounting recess 22, thereby reinforcing the reinforcing ring. 11 outward flange 11d is subjected to elastic deformation such that it relatively falls to the outside B side. In addition, since the recessed part 12c continued to the circumferential direction is formed in the edge part by the side of the outward flange 11d of the reinforcement ring 11 among the outer peripheral surfaces of the machine inner peripheral seal part 12a, the inclined deformation of the outward flange 11d However, it is difficult to be hindered by the tensile stress of the inner peripheral seal portion 12a.

  For this reason, as the amount of elastic deformation of the outward flange 11d of the reinforcing ring 11 increases, the tapered surface 11f of the locked claw 11e moves the tapered surface 24 formed at the opening end of the mounting recess 22 toward the smaller diameter side. It slides and is press-fitted into the inner peripheral surface of the mounting recess 22 before long. At this time, since the outer peripheral seal portion 12b of the outer peripheral seal portion 12 is slightly displaced toward the inner diameter side due to the inclined deformation of the outward flange 11d, the press-fitting resistance to the inner peripheral surface of the mounting recess 22 is suppressed.

  Thus, the sealing device 1 is inserted to a predetermined axial position in the mounting recess 22 of the housing 2, that is, in the illustrated example, the front end of the inner peripheral seal portion 12 a in the outer peripheral seal portion 12 is the mounting recess 22 of the housing 2. When the sealing device 1 is inserted to a position where it contacts the end surface 22a on the in-machine A side, the locked claw 11e of the reinforcing ring 11 reaches the position on the inner peripheral side of the locking groove 23. The to-be-latched claw 11e is fitted into the retaining groove 23 by the elastic restoring force of the outward flange 11d of the reinforcing ring 11. At this time, when the outward flange 11d is restored to the original shape, the machine-side outer peripheral seal portion 12b in the outer peripheral seal portion 12 is slightly displaced toward the outer diameter side, and the outer peripheral surface thereof has an appropriate surface pressure and the inner periphery of the mounting recess 22 Close to the face.

  And once the to-be-latched claw 11e is fitted in the latching groove 23 of the housing 2, the to-be-latched claw 11e has the surface facing the out-of-machine B side and the out-of-machine B of the latching groove 23. Since the side surface 23a on the side faces the axial direction between the surfaces orthogonal to the axis O, in the mounted state shown in FIG. 1, the sealing device 1 against the load on the outside B side due to an increase in the internal pressure of the inside A, etc. It exerts a great drag and can be securely retained.

  Next, FIG. 4 shows 2nd Embodiment of the fixing structure of the sealing device based on this invention. In this second embodiment, the difference from the first embodiment described above is that the outer diameter end of the latching claw 11e faces the outside B side, and the inside of the mounting recess 22 of the housing 2 The point is that it is elastically deformed to the inner diameter side when it is press-fitted into the peripheral surface. Specifically, the hooked claw 11e has a small diameter on the in-machine A side by a groove 11g extending continuously in the circumferential direction in the vicinity of the outer diameter end of the surface facing the out-of-machine B side of the outward flange 11d of the reinforcing ring 11. It is formed in the shape of a conical cylinder. Other parts can be configured in the same manner as in the first embodiment.

  That is, according to the second embodiment, in the process of mounting the sealing device 1 in the mounting recess 22 of the housing 2, first, the machine-side outer peripheral seal portion 12 a of the outer peripheral seal portion 12 is connected to the mounting recess 22 of the housing 2. The inner periphery of the mounting recess 22 and the outer peripheral surface of the cylindrical portion 11a of the reinforcing ring 11 are pressed in while being compressed in the radial direction, and project from the outer peripheral seal portion 12 to the outer peripheral side. The to-be-latched claw 11e eventually interferes with the tapered surface 24 formed at the opening end of the mounting recess 22. And since the to-be-latched claw 11e has a conical cylindrical shape with a small diameter on the machine A side, the tapered surface formed at the opening end of the mounting recess 22 while undergoing elastic deformation to the inner diameter side due to interference with the tapered surface 24. 24 is slid to the small diameter side, and is eventually press-fitted into the inner peripheral surface of the mounting recess 22.

  Thus, the sealing device 1 is inserted to a predetermined axial position in the mounting recess 22 of the housing 2, that is, in the illustrated example, the front end of the inner peripheral seal portion 12 a in the outer peripheral seal portion 12 is the mounting recess 22 of the housing 2. When the sealing device 1 is inserted to a position where it contacts the end surface 22a on the in-machine A side, the locked claw 11e of the reinforcing ring 11 reaches the position on the inner peripheral side of the locking groove 23. The to-be-latched claw 11 e is displaced in diameter by its own elastic restoring force and fits into the retaining groove 23.

  Then, once the locked claw 11e is fitted in the locking groove 23 of the housing 2, the locked claw 11e has a flat surface whose tip facing the outboard side B is orthogonal to the axis O. Since the engaging groove 23 faces the side surface 23a on the outside B side of the machine, the sealing device 1 exerts a large resistance against the load on the outside B side due to an increase in the internal pressure of the inside A and so on, and reliably prevents it from coming off. Can do.

DESCRIPTION OF SYMBOLS 1 Sealing device 11 Reinforcement ring 11e Locked claw 11f Tapered surface 12 Outer periphery seal part 13 Main lip 2 Housing 23 Locking groove 24 Tapered surface 3 Axis

Claims (3)

  A reinforcing ring, an outer peripheral seal portion that is provided integrally with the reinforcing ring and is closely fitted to the inner peripheral surface of the housing, and an outer peripheral surface of the shaft that is inserted into the inner periphery of the housing are slidably in close contact with each other. A locking claw protruding to the outer peripheral side of the outer peripheral seal portion is formed on the reinforcing ring of the sealing device including the main lip, and the locking claw can be press-fitted into the inner peripheral surface of the housing. In addition, the sealing device fixing structure can be locked in a locking groove formed on the inner peripheral surface of the housing.   2. A taper surface having a small diameter on the inner side is formed at an inner side end portion of an outer diameter end portion of the hooked claw and an outer side end portion of an inner peripheral surface of the housing. The fixing structure of the sealing device according to 1.   The fixing of the sealing device according to claim 1 or 2, characterized in that the outer diameter end portion of the latching claw faces the outside of the machine and is elastically deformable to the inner diameter side when being pressed into the inner peripheral surface of the housing. Construction.

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