JP2017219169A - Mounting structure of sealing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mounting structure of a sealing device having improved separation force of a sealing device 1 from pressure of fluid to be sealed in a machine A.SOLUTION: A mounting structure of a sealing device is configured such that a stationary seal part 11 comprising a rubber elastic body provided on an outer periphery of a sealing device 1 is press-fitted into an inner peripheral surface of a seal mounting part 22 formed in a housing 2. On the inner peripheral surface of the seal mounting part 22, formed is an annular locking grove 23 to which a part of the stationary seal part 11 is inserted and locked in a filling state. The locking groove 23 comprises a plurality of small cross sectional grooves and has a cross sectional shape bent in a zigzag manner.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a mounting structure for a sealing device that is used in automobiles, general machines, industrial machines, and the like and seals with a sealing lip.

  2. Description of the Related Art Conventionally, as shown in FIG. 6, a sealing device mounting structure is known. A sealing device denoted by reference numeral 100 includes a fixed seal portion 101, a radial direction portion 102 extending from one end in the axial direction to the inner diameter side, and a seal lip 103 extending from the inner diameter end of the radial direction portion 102, which are formed of a rubber elastic body. A metal reinforcing ring 104 is integrally embedded from the fixed seal portion 101 to the radial direction portion 102, and a garter spring 105 is fitted on the outer periphery of the seal lip 103.

  That is, in this sealing device 100, the fixed seal portion 101 is press-fitted to the inner peripheral surface of the seal mounting portion 202 formed at the end of the shaft hole 201 of the housing 200 of the device, and is directed toward the in-machine A side. The lip end portion 103a of the inner diameter of the seal lip 103 is slidably brought into close contact with the outer peripheral surface of the rotary shaft 300 inserted through the shaft hole 201 of the housing 200, so that the fluid to be sealed in the machine A is machined from the shaft circumference. This prevents leakage to the outside B.

  An annular locking groove 203 that is continuous in the circumferential direction is formed on the inner peripheral surface of the seal mounting portion 202 of the housing 200. As shown in FIG. 7, the locking groove 203 has a locking surface 203a that forms a plane substantially perpendicular to the axis O and rises in the outer diameter direction and faces the machine A side, and from the outer diameter end to the machine inner side. A part of the fixed seal portion 101 which is composed of a tapered surface 203b extending on the A side so as to have a small diameter and is compressed in the radial direction by the amount of the fastening allowance δ in the process of press-fitting the sealing device 100 into the seal mounting portion 202 of the housing 200. 101a is locked in a state of entering into the locking groove 203 by a reaction force against compression.

  In addition, since a part 101a of the fixed seal portion 101 of the sealing device 100 enters the locking groove 203 in the seal mounting portion 202 of the housing 200 and is locked, the sealing target fluid of the machine A is sealed. The detachment force of the sealing device 100 with respect to the pressure is increased, and the detachment of the sealing device 100 from the seal mounting portion 202 due to the pressure increase of the fluid to be sealed is prevented (see, for example, Patent Document 1 below).

JP 2010-150958 A

  However, depending on the device, it has been desired to further improve the separation force of the sealing device 100 with respect to the pressure of the fluid to be sealed in the machine A.

  The present invention has been made in view of the above points, and its technical problem is to provide a mounting structure for a sealing device that improves the detachment force of the sealing device with respect to the pressure of the fluid to be sealed in the machine. There is to do.

  In order to solve the technical problem described above, the mounting structure of the sealing device according to the invention of claim 1 includes a seal mounting portion in which a fixed seal portion made of a rubber elastic body provided on the outer periphery of the sealing device is formed on the housing. A sealing device mounting structure that is press-fitted into an inner peripheral surface, and an annular locking groove in which a part of the fixed seal portion enters and is locked into the inner peripheral surface of the seal mounting portion The locking groove is formed of a plurality of small cross-sectional grooves and has a cross-sectional shape bent in a zigzag manner.

  According to a second aspect of the present invention, there is provided the sealing device mounting structure according to the first aspect, wherein a small cross-sectional groove recessed in the axial direction is formed on a surface of the locking groove facing the machine inner side. Is.

  According to a third aspect of the present invention, there is provided the sealing device mounting structure according to the first or second aspect, wherein the fixed seal portion is provided with a locked protrusion having a cross-sectional shape substantially corresponding to the locking groove. Is.

  According to the mounting structure of the sealing device according to the present invention, in a state where a part of the fixed seal portion of the sealing device enters and is locked into the locking groove formed in the seal mounting portion of the housing, the locking groove However, due to increased cross-sectional shape consisting of a plurality of small cross-sectional grooves bent in a zigzag manner, the detachment force of the sealing device increases due to the increase in the drag resistance. To be prevented.

1 is a half cross-sectional view showing a first embodiment of a sealing device mounting structure according to the present invention by cutting along a plane passing through an axis; In 1st embodiment of the mounting structure of the sealing device which concerns on this invention, it is a half sectional view which cut | disconnects and shows the mounting process of a sealing device by the plane which passes along an axial center. It is a principal part expanded sectional view which shows the latching groove in 1st embodiment of the mounting structure of the sealing device which concerns on this invention. It is a principal part expanded sectional view which shows 2nd embodiment of the mounting structure of the sealing device which concerns on this invention. FIG. 10 is a half sectional view showing a third embodiment of the sealing device mounting structure according to the present invention by cutting along a plane passing through an axis; FIG. 10 is a half cross-sectional view showing an example of a mounting structure for a sealing device according to a conventional technique, cut along a plane passing through an axis. In an example of the mounting structure of the sealing device which concerns on the prior art, it is a half cross-sectional view which shows the mounting process of a sealing device cut | disconnected by the plane which passes along an axial center.

  Hereinafter, a preferred embodiment of a sealing device mounting structure according to the present invention will be described with reference to the drawings.

  First, FIG. 1 shows a first embodiment. In this embodiment, reference numeral 1 is a sealing device, 2 is a housing of an apparatus, and 3 is a rotating shaft that is rotatably inserted into a shaft hole 21 of the housing 2.

  The sealing device 1 has a well-known configuration, and includes a fixed seal portion 11 that is press-fitted to an inner peripheral surface of a seal mounting portion 22 formed at an outer end portion of the shaft hole 21 of the housing 2. A rubber-elastic body includes a radial portion 12 extending from one end in the axial direction toward the inner diameter side, and a seal lip 13 extending from the inner diameter end of the radial portion 12 and slidably in contact with the outer peripheral surface of the rotary shaft 3. A metal reinforcing ring 14 is integrally embedded from the fixed seal portion 11 to the radial direction portion 12 and a garter spring 15 is fitted on the outer periphery of the seal lip 13.

  The reinforcing ring 14 is manufactured, for example, by punching and stamping a steel plate or the like, and is formed on the inner diameter side from the outer diameter cylindrical portion 14a and the end of the outer diameter cylindrical portion 14a which is the outside B side in the mounted state. It consists of an inward flange 14b extending to the bottom.

  The fixed seal portion 11 is integrally joined to the outer peripheral surface of the outer diameter cylindrical portion 14a of the reinforcing ring 14, and in the state before mounting, it has a cylindrical shape as shown in FIG. The diameter of the seal mounting portion 22 is appropriately larger than the inner peripheral surface of the seal mounting portion 22, that is, a tightening allowance δ with respect to the inner peripheral surface of the seal mounting portion 22 is set. The tightening allowance δ is about the same as the conventional one.

  The radial direction portion 12 has an outer diameter portion that is continuous with the fixed seal portion 11, an inner diameter portion that is continuous with the root of the seal lip 13, and a surface on the outside B side of the inward flange portion 14 b of the reinforcing ring 14. It is integrally joined to.

  The seal lip 13 extends from the position on the inner peripheral side of the inward flange portion 14b of the reinforcing ring 14 to the direction toward the in-machine A side in the mounted state, and is formed with a substantially V-shaped raised shape on the inner peripheral surface. The lip end 13a is slidably in close contact with the outer peripheral surface of the rotary shaft 3.

  The garter spring 15 is formed by connecting metal coil springs in an annular shape, and is fitted into an annular groove formed on the outer peripheral side of the lip end portion 13 a of the seal lip 13. This compensates for a decrease in the tightening force with time and ensures the radial followability of the seal lip 13 with respect to the rotating shaft 3.

  On the other hand, an annular locking groove 23 is formed on the inner peripheral surface of the seal mounting portion 22 of the housing 2 to which the sealing device 1 is mounted. As shown in FIG. 2, when the sealing device 1 is press-fitted into the inner peripheral surface of the seal mounting portion 22 with the same allowance δ as shown in FIG. 2, the locking groove 23 is formed on the outer diameter cylindrical portion 14a of the reinforcing ring 14. A depth at which a part of the fixed seal portion 11 can enter in a substantially filled state by the restoring force of the rubber elastic body of the fixed seal portion 11 against compression between the outer peripheral surface and the inner peripheral surface of the seal mounting portion 22; It has a cross-sectional area and has three small cross-sectional grooves 231 to 233, that is, a cross-sectional shape bent in a zigzag manner.

  Specifically, as shown in FIG. 3, among the small cross-sectional grooves 231 to 233 constituting the locking groove 23, the first small cross-sectional groove 231 forms a plane substantially orthogonal to the axis O and is in the outer diameter direction. The second small cross-sectional groove 232 has a first small cross section, and includes a locking surface 231a that rises toward the machine A side and a tapered surface 231b that extends from the outer diameter end so that the machine A side has a small diameter. A locking surface 232a that rises in the outer diameter direction from the end on the in-machine A side in the groove 231 to the outer diameter direction and faces the in-machine A side, and has a smaller diameter on the in-machine A side from the outer diameter end. The third small cross-sectional groove 233 is a shape recessed in the axial direction from the locking surface 231a in the first small cross-sectional groove 231 and has a cylindrical surface 233a, Extends from the inner end so that the inboard A side has a smaller diameter And over tapered surface 233b, consisting of.

  Since the locking groove 23 is formed with the depth and the cross-sectional area as described above, in the mounted state shown in FIG. 1, the locking groove 23 has an outer peripheral surface of the outer diameter cylindrical portion 14 a of the reinforcing ring 14. A portion 11a of the fixed seal portion 11 enters the substantially filled state and is locked by the restoring force of the rubber elastic body of the fixed seal portion 11 compressed between the inner peripheral surface of the seal mounting portion 22 and .

  A tapered chamfer 24 is provided at the end of the inner peripheral surface of the seal mounting portion 22 that opens to the outer end surface of the housing 2. This chamfer 24 is for facilitating the press-fitting and mounting operation of the sealing device 1 to the seal mounting portion 22.

  In the above configuration, the sealing device 1 is mounted in the state shown in FIG. 1 by being press-fitted into the inner peripheral surface of the seal mounting portion 22 in the housing 2 so that the seal lip 13 faces the in-machine A side. The lip end portion 13a of the inner diameter of the seal lip 13 is slidably brought into close contact with the outer peripheral surface of the rotary shaft 3, thereby preventing the fluid to be sealed from leaking from the shaft periphery to the outside B. .

  In addition, since the part 11a of the fixed seal portion 11 of the sealing device 1 has a mounting structure in which the locking groove 23 in the seal mounting portion 22 of the housing 2 enters and is locked in a substantially filled state, the seal mounting portion Even if the tightening allowance δ of the fixed seal portion 11 with respect to 22 is about the same as the conventional one, the detachment force of the sealing device 1 with respect to the pressure of the fluid to be sealed in the machine A becomes high, and thus the pressure in the machine A increases. The separation of the sealing device 1 from the seal mounting portion 22 is effectively prevented.

  This is because the engaging groove 23 has a cross-sectional shape bent in a zigzag manner by a plurality of small cross-sectional grooves 231 to 233, so that the friction resistance surface with the part 11a of the fixed seal portion 11 entering the engaging groove 23 is obtained. (Contact surface) is large, and it is a hooking resistance due to axially facing a plurality of locking surfaces 231a and 232a that rise in the outer diameter direction in a plane substantially orthogonal to the axis O. This is because the detachment force in the direction is high.

  Then, due to the detachment force acting on the sealing device 1 toward the outside B side, a pulling force is generated such that a part 11 a of the fixed seal portion 11 entering the locking groove 23 comes out from the locking groove 23 in the inner diameter direction. When received, the fact that the third small cross-sectional groove 233 extending in the axial direction of the locking groove 23 becomes a resistance against such a pulling force effectively contributes to an increase in the separating force in the axial direction. Yes.

  Further, as described above, even if the tightening allowance δ is about the same as the conventional one, the releasing force of the sealing device 1 with respect to the pressure in the machine A increases, so that the tightening allowance δ is increased for the purpose of increasing the releasing force. Therefore, there is no need to increase the press-fitting resistance when the sealing device 1 is press-fitted into the inner peripheral surface of the seal mounting portion 22.

  Moreover, since the locking groove 23 of the seal mounting portion 22 and the part 11a of the fixed seal portion 11 of the sealing device 1 are fitted in a complicated uneven shape, the sealing performance between the housing 2 and the sealing device 1 is improved. Can be expensive.

  Next, FIG. 4 shows a second embodiment of the mounting structure of the sealing device according to the present invention. In the second embodiment, the difference from the first embodiment described above is that the fixed seal portion 11 has a protruding shape substantially corresponding to the locking groove 23 in the seal mounting portion 22 of the housing 2. The point is that the protrusion 111 is formed. Other parts can be configured in the same manner as in the first embodiment.

  In this way, even if the tightening allowance δ of the fixed seal portion 11 with respect to the seal mounting portion 22 of the housing 2 is smaller than that in FIG. 2, the engaged state formed in a protruding shape substantially corresponding to the locking groove 23. Since the stop projection 111 has a mounting structure in which it is locked in the locking groove 23 in the seal mounting portion 22 of the housing 2 in a filled state, the separation force of the sealing device 1 can be sufficiently increased in this case as well. For this reason, the press-fitting resistance when the sealing device 1 is press-fitted into the inner peripheral surface of the seal mounting portion 22 can be further reduced.

  Next, FIG. 5 shows a third embodiment of the mounting structure of the sealing device according to the present invention. In the third embodiment, the difference from the first embodiment described above is that the locking groove 23 of the seal mounting portion 22 has two small cross-sectional grooves 234 and 235, and has an M-shaped zigzag shape. It has a bent cross-sectional shape. Other parts can be configured in the same manner as in the first embodiment.

  Specifically, among the small cross-sectional grooves 234 and 235 in the locking groove 23, the small cross-sectional groove 234 on the relatively outside B side forms a plane substantially orthogonal to the axis O and rises in the outer diameter direction and is inside the machine. The small cross-sectional groove 235 on the in-machine A side is symmetrical to the small cross-sectional groove 234, and includes a locking surface facing the A side and a tapered surface extending from the outer diameter end so that the in-machine A side has a small diameter. , That is, a locking surface that forms a plane substantially perpendicular to the axis O and rises in the outer diameter direction and faces the in-machine B side, and a tapered surface that extends from the outer diameter end so that the in-machine B side has a small diameter And consist of

  This embodiment also has a cross-sectional shape in which the locking groove 23 is bent in a zigzag manner, and a relative angled projection between the small cross-sectional grooves 234 and 235 in addition to the locking surface facing the in-machine A side of the small cross-sectional groove 234. Therefore, even if the tightening allowance δ of the fixed seal portion 11 with respect to the seal mounting portion 22 is about the same as the conventional one, the detachment force of the sealing device 1 against the pressure of the fluid to be sealed in the machine A is high. Therefore, the detachment of the sealing device 1 from the seal mounting portion 22 due to the pressure increase of the fluid to be sealed is effectively prevented.

  Further, unlike the first embodiment, the locking groove 23 does not have a small cross-sectional groove that is recessed in the axial direction, so that the locking groove 23 in the seal mounting portion 22 of the housing 2 can be easily processed. It is.

  In addition, although the sealing device of each embodiment mentioned above was demonstrated as what seals a rotating shaft, this invention is applicable also to the sealing device which seals the axis | shaft which carries out an axial reciprocating motion or a rocking motion. The separation force with respect to the pressure of the fluid to be sealed in the machine can be improved.

DESCRIPTION OF SYMBOLS 1 Sealing device 11 Fixed seal | sticker part 111 Locked protrusion 13 Seal lip 14 Reinforcement ring 2 Housing 21 Shaft hole 22 Seal mounting part 23 Locking groove 231-235 Small section groove | channel 3 Rotating shaft

Claims (3)

  A sealing device mounting structure in which a fixed seal portion made of a rubber elastic body provided on an outer periphery of a sealing device is press-fitted to an inner peripheral surface of a seal mounting portion formed on a housing, and includes an inside of the seal mounting portion. On the peripheral surface, an annular locking groove is formed in which a part of the fixed seal portion enters and is locked, and the locking groove is formed of a plurality of small cross-sectional grooves and has a zigzag cross-sectional shape. A mounting structure for a sealing device, characterized by:   The mounting structure for a sealing device according to claim 1, wherein a small cross-sectional groove recessed in the axial direction is formed on a surface of the locking groove facing the inner side.   The mounting structure for a sealing device according to claim 1 or 2, wherein a locking projection having a cross-sectional shape substantially corresponding to the locking groove is formed on the fixed seal portion.

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